NEWS

This file describes changes in recent versions of Slurm. It primarily
documents those changes that are of interest to users and administrators.

* Changes in Slurm 17.02.0pre4
==============================
 -- Add support for per-partitiion OverTimeLimit configuration.
 -- Add --mem_bind option of "sort" to run zonesort on KNL nodes at step start.
 -- Add LaunchParameters=mem_sort option to set configur running of zonesort
    by default at step startup.

* Changes in Slurm 17.02.0pre3
==============================
 -- Add srun host & PID to job step data structures.
 -- Avoid creating duplicate pending step records for the same srun command.
 -- Rewrite srun's logic for pending steps for better efficiency (fewer RPCs).
 -- Added new SchedulerParameters options step_retry_count and step_retry_time
    to control scheduling behaviour of job steps waiting for resources.
 -- Optimize resource allocation logic for --spread-job job option.
 -- Modify cpu_bind and mem_bind map and mask options to accept a repetition
    count to better support large task count. For example:
    "mask_mem:0x0f*2,0xf0*2" is equivalent to "mask_mem:0x0f,0x0f,0xf0,0xf0".
 -- Add suppoprt for --mem_bind=prefer option to prefer, but not restrict memory
    use to the identified NUMA node.
 -- Add mechanism to constrain kernel memory allocation using cgroups. New
    cgroup.conf parameters added: ConstrainKmemSpace, MaxKmemPercent, and
    MinKmemSpace.
 -- Correct invokation of man2html, which previously could cause FreeBSD builds
    to hang.
 -- MYSQL - Unconditionally remove 'ignore' clause from 'alter ignore'.
 -- Modify service files to not start Slurm daemons until after Munge has been
    started.
    NOTE: If you are not using Munge, but are using the "service" scripts to
    start Slurm daemons, then you will need to remove this check from the
    etc/slurm*service scripts.
 -- Do not process SALLOC_HINT, SBATCH_HINT or SLURM_HINT environment variables
    if any of the following salloc, sbatch or srun command line options are
    specified: -B, --cpu_bind, --hint, --ntasks-per-core, or --threads-per-core.
 -- burst_buffer/cray: Accept new jobs on backup slurmctld daemon without access
    to dw_wlm_cli command. No burst buffer actions will take place.
 -- Do not include SLURM_JOB_DERIVED_EC, SLURM_JOB_EXIT_CODE, or
    SLURM_JOB_EXIT_CODE in PrologSlurmctld environment (not available yet).
 -- Cray - set task plugin to fatal() if task/cgroup is not loaded after
    task/cray in the TaskPlugin settings.
 -- Remove separate slurm_blcr package. If Slurm is built with BLCR support,
    the files will now be part of the main Slurm packages.
 -- Replace sjstat, seff and sjobexit RPM packages with a single "contribs"
    package.
 -- Remove long since defunct slurmdb-direct scripts.
 -- Add SbcastParameters configuration option to control default file
    destination directory and compression algorithm.
 -- Add new SchedulerParameter (max_array_tasks) to limit the maximum number of
    tasks in a job array independently from the maximum task ID (MaxArraySize).
 -- Fix issue where number of nodes is not properly allocated when sbatch and
    salloc are requested with -n tasks < hosts from -w hostlist or from -N.
 -- Add infrastructure for submitting federated jobs.

* Changes in Slurm 17.02.0pre2
==============================
 -- Add new RPC (REQUEST_EVENT_LOG) so that slurmd and slurmstepd can log events
    through the slurmctld daemon.
 -- Remove sbatch --bb option. That option was never supported.
 -- Automically cleanup task/cgroup cpuset and devices cgroups after steps are
    done.
 -- Add federation read/write locks.
 -- Limit job purge run time to 1 second at a time.
 -- The database index for jobs is now 64 bit.  If you happen to be close to
    4 billion jobs in your database you will want to update your slurmctld at
    the same time as your slurmdbd to prevent roll over of this variable as
    it is 32 bit previous versions of Slurm.
 -- Optionally lock slurmstepd in memory for performance reasons and to avoid
    possible SIGBUS if the daemon is paged out at the time of a Slurm upgrade
    (changing plugins). Controlled via new LaunchParameters options of
    slurmstepd_memlock and slurmstepd_memlock_all.
 -- Add event trigger on burst buffer errors (see strigger man page,
    --burst_buffer option).
 -- Add job AdminComment field which can only be set by a Slurm administrator.
 -- Add salloc, sbatch and srun option of --delay-boot=<time>, which will
    temporarily delay booting nodes into the desired state for a job in the
    hope of using nodes already in the proper state which will be available at
    a later time.
 -- Add job burst_buffer_state and delay_boot fields to scontrol and squeue
    output. Also add ability to modify delay_boot from scontrol.
 -- Fix for node's available tres array getting filled in with configured gres
    model types.
 -- Log if job --bb option contains any unrecognized content.
 -- Display configured and allocated tres for nodes in scontrol show nodes.
 -- Change all memory values (in MB) to uint64_t to accommodate > 2TB per node.
 -- Add MailDomain option to qualify email addresses.
 -- Refactor the persistent connections within the federation code to use
    the same logic that was found in the slurmdbd.  Now both functionalities
    share the same code.
 -- Remove BlueGene/L and BlueGene/P support.
 -- Add "flag" field to launch_tasks_request_msg. Remove the following fields
    (moved into flags): multi_prog, task_flags, user_managed_io, pty,
    buffered_stdio, and labelio.
 -- Add protocol version to slurmd startup communications for slurmstepd to
    permit changes in the protocol.

* Changes in Slurm 17.02.0pre1
==============================
 -- burst_buffer/cray - Add support for rounding up the size of a buffer reqeust
    if the DataWarp configuration "equalize_fragments" is used.
 -- Remove AIX support.
 -- Rename "in" to "input" in slurm_step_io_fds data structure defined in
    slurm.h. This is needed to avoid breaking Python with by using one of its
    keywords in a Slurm data structure.
 -- Remove eligible_time from jobcomp/elasticsearch.
 -- Fix issue where if no clusters were added but yet a QOS needed to be
    deleted make it possible.
 -- SlurmDBD - change all timestamps to bigint from int to solve Y2038 problem.
 -- Add salloc/sbatch/srun --spread-job to distribute tasks over as many nodes
    as possible. This also treats the --ntasks-per-node option as a maximum
    value.
 -- Add ConstrainKmemSpace to cgroup.conf, defaulting to yes, to allow
    cgroup Kmem enforcement to be disabled while still using ConstrainRAMSpace.
 -- Add support for sbatch --bbf option.
 -- Add burst buffer support for job arrays. Add new SchedulerParameters option
    of bb_array_stage_cnt=# to indicate how many pending tasks of a job array
    should be made available for burst buffer resource allocation.
 -- Fix small memory leak when a job fails to load from state save.
 -- Fix invalid read when attempting to delete clusters from db with running
    jobs.
 -- Fix small memory leak when deleting clusters from db.
 -- Add SLURM_ARRAY_TASK_COUNT environment variable. Total number of tasks in a
    job array (e.g. "--array=2,4,8" will set SLURM_ARRAY_TASK_COUNT=3).
 -- Add new sacctmgr commands: "shutdown" (shutdown the server), "list stats"
    (get server statistics) "clear stats" (clear server statistics).
 -- Restructure job accounting query to use 'id_job in (1, 2, .. )' format
    instead of logically equivalent 'id_job = 1 || id_job = 2 || ..' .
 -- Added start_delay field to jobcomp/elasticsearch.
 -- In order to support federated jobs, the MaxJobID configuration parameter
    default value has been reduced from 2,147,418,112 to 67,043,328 and its
    maximum value is now 67,108,863. Upon upgrading, any pre-existing jobs that
    have a job ID above the new range will continue to run and new jobs will get
    job IDs in the new range.
 -- Added infrastructure for setting up federations in database and establishing
    connections between federation clusters.

* Changes in Slurm 16.05.7
==========================
 -- Fix issue in the priority/multifactor plugin where on a slurmctld restart
    more time than should be allowed would be accounted for.
 -- cray/busrt_buffer - If total_space in a pool decreases, reset used_space
    rather than trying to account for buffer allocations in progress.
 -- cray/busrt_buffer - Fix for double counting of used_space at slurmctld
    startup.
 -- Fix regression in 16.05.6 where if you request multiple cpus per task (-c2)
    and request --ntasks-per-core=1 and only 1 task on the node
    the slurmd would abort on an infinite loop fatal.
 -- cray/busrt_buffer - Internally track both allocated and unusable space.
    The reported UsedSpace in a pool is now the allocated space (previously was
    unusable space). Base available space on whichever value leaves least free
    space.
 -- cray/burst_buffer - Preserve job ID and don't translate to job array ID.

* Changes in Slurm 16.05.6
==========================
 -- Docs - the correct default value for GroupUpdateForce is 0.
 -- mpi/pmix - improve point to point communication performance.
 -- SlurmDB - include pending jobs in search during 'sacctmgr show runawayjobs'.
 -- Add client side out-of-range checks to --nice flag.
 -- Fix support for sbatch "-W" option, previously eeded to use "--wait".
 -- node_features/knl_cray plugin and capmc_suspend/resume programs modified to
    sleep and retry capmc operations if the Cray State Manager is down. Added
    CapmcRetries configuration parameter to knl_cray.conf.
 -- node_features/knl_cray plugin: Remove any KNL MCDRAM or NUMA features from
    node's configuration if capmc does NOT report the node as being KNL.
 -- node_features/knl_cray plugin: drain any node not reported by
    "capmc node_status" on startup or reconfig.
 -- node_features/knl_cray plugin: Substantially streamline and speed up logic
    to load current node state on reconfigure failure or unexpected node boot.
 -- node_features/knl_cray plugin: Add separate thread to interact with capmc
    in response to unexpected node reboots.
 -- node_features plugin - Add "mode" argument to node_features_p_node_xlate()
    function to fix some bugs updating a node's features using the node update
    RPC.
 -- node_features/knl_cray plugin: If the reconfiguration of nodes for an
    interactive job fails, kill the job (it can't be requeued like a batch job).
 -- Testsuite - Added srun/salloc/sbatch tests with --use-min-nodes option.
 -- Fix typo when an error occurs when discovering pmix version on
    configure.
 -- Fix configuring pmix support when you have your lib dir symlinked to lib64.
 -- Fix waiting reason if a job is waiting for a specific limit instead of
    always just AccountingPolicy.
 -- Correct SchedulerParameters=bf_busy_nodes logic with respect to the job's
    minimum node count. Previous logic would not decremement counter in some
    locations and reject valid job request for not reaching minimum node count.
 -- Fix FreeBSD-11 build by using llabs() function in place of abs().
 -- Cray: The slurmd can manipulate the socket/core/thread values reported based
    upon the configuration. The logic failed to consider select/cray with
    SelectTypeParameters=other_cons_res as equivalent to select/cons_res.
 -- If a node's socket or core count are changed at registration time (e.g. a
    KNL node's NUMA mode is changed), change it's board count to match.
 -- Prevent possible divide by zero in select/cons_res if a node's board count
    is higher than it's socket count.
 -- Allow an advanced reservation to contain a license count of zero.
 -- Preserve non-KNL node features when updating the KNL node features for a
    multi-node job in which the non-KNL node features vary by node.
 -- task/affinity plugin: Honor a job's --ntasks-per-socket and
    --ntasks-per-core options in task binding.
 -- slurmd - do not print ClusterName when using 'slurmd -C'.
 -- Correct a bitmap test function (used only by the select/bluegene plugin).
 -- Do not propagate SLURM_UMASK environment variable to batch script.
 -- Added node_features/knl_generic plugin for KNL support on non-Cray systems.
 -- Cray: Prevent abort in backfill scheduling logic for requeued job that has
    been cancelled while NHC is running.
 -- Improve reported estimates of start and end times for pending jobs.
 -- pbsnodes: Show OS value as "unknown" for down nodes.
 -- BlueGene - correctly scale node counts when enforcing MaxNodes limit take 2.
 -- Fix "sbatch --hold" to set JobHeldUser correctly instead of JobHeldAdmin.
 -- Cray - print warning that task/cgroup is required, and must be after
    task/cray in the TaskPlugin settings.
 -- Document that node Weight takes precedence over load with LLN scheduling.
 -- Fix issue where gang scheduling could happen even with OverSubscribe=NO.
 -- Expose JOB_SHARED_* values to job_submit/lua plugin.
 -- Fix issue where number of nodes is not properly allocated when srun is
    requested with -n tasks < hosts from -w hostlist.
 -- Update srun documentation for -N, -w and -m arbitrary.
 -- Fix bug that was clearing MAINT mode on nodes scheduled for reboot (bug
    introduced in version 16.05.5 to address bug in overlapping reservations).
 -- Add logging of node reboot requests.
 -- Docs - remove recommendation for ReleaseAgent setting in cgroup.conf.
 -- Make sure a job cleans up completely if it has a node fail.  Mostly an
    issue with gang scheduling.

* Changes in Slurm 16.05.5
==========================
 -- Fix accounting for jobs requeued after the previous job was finished.
 -- slurmstepd modified to pre-load all relevant plugins at startup to avoid
    the possibility of modified plugins later resulting in inconsistent API
    or data structures and a failure of slurmstepd.
 -- Export functions from parse_time.c in libslurm.so.
 -- Export unit convert functions from slurm_protocol_api.c in libslurm.so.
 -- Fix scancel to allow multiple steps from a job to be cancelled at once.
 -- Update and expand upgrade guide (in Quick Start Administrator web page).
 -- burst_buffer/cray: Requeue, but do not hold a job which fails the pre_run
    operation.
 -- Insure reported expected job start time is not in the past for pending jobs.
 -- Add support for PMIx v2.
 -- mpi/pmix: support for passing TMPDIR path through info key
 -- Cray: update slurmconfgen_smw.py script to correctly identify service nodes
    versus compute nodes.
 -- FreeBSD - fix build issue in knl_cray plugin.
 -- Corrections to gres.conf parsing logic.
 -- Make partition State independent of EnforcePartLimits value.
 -- Fix multipart srun submission with EnforcePartLimits=NO and job violating
    the partition limits.
 -- Fix problem updating job state_reason.
 -- pmix - Provide HWLOC topology in the job-data if Slurm was configured
    with hwloc.
 -- Cray - Fix issue restoring jobs when blade count increases due to hardware
    reconfiguration.
 -- burst_buffer/cray - Hold job after 3 failed pre-run operations.
 -- sched/backfill - Check that a user's QOS is allowed to use a partition
    before trying to schedule resources on that partition for the job.
 -- sacctmgr - Fix displaying nodenames when printing out events or
    reservations.
 -- Fix mpiexec wrapper to accept task count with more than one digit.
 -- Add mpiexec man page to the script.
 -- Add salloc_wait_nodes option to the SchedulerParameters parameter in the
    slurm.conf file controlling when the salloc command returns in relation to
    when nodes are ready for use (i.e. booted).
 -- Handle case when slurmctld daemon restart while compute node reboot in
    progress. Return node to service rather than setting DOWN.
 -- Preserve node "RESERVATION" state when one of multiple overlapping
    reservations ends.
 -- Restructure srun command locking for task_exit processing logic for improved
    parallelism.
 -- Modify srun task completion handling to only build the task/node string for
    logging purposes if it is needed. Modified for performance purposes.
 -- Docs - update salloc/sbatch/srun man pages to mention corresponding
    environment variables for --mem/--mem-per-cpu and allowed suffixes.
 -- Silence srun warning when overriding the job ntasks-per-node count
    with a lower task count for the step.
 -- Docs - assorted spelling fixes.
 -- node_features/knl_cray: Fix bug where MCDRAM state could be taken from
    capmc rather than cnselect.
 -- node_features/knl_cray: If a node is rebooted outside of Slurm's direction,
    update it's active features with current MCDRAM and NUMA mode information.
 -- Restore ability to manually power down nodes, broken in 15.08.12.
 -- Don't log error for job end_time being zero if node health check is still
    running.
 -- When powering up a node to change it's state (e.g. KNL NUMA or MCDRAM mode)
    then pass to the ResumeProgram the job ID assigned to the nodes in the
    SLURM_JOB_ID environment variable.
 -- Allow a node's PowerUp state flag to be cleared using update_node RPC.
 -- capmc_suspend/resume - If a request modify NUMA or MCDRAM state on a set of
    nodes or reboot a set of nodes fails then just requeue the job and abort the
    entire operation rather than trying to operate on individual nodes.
 -- node_features/knl_cray plugin: Increase default CapmcTimeout parameter from
    10 to 60 seconds.
 -- Fix squeue filter by job license when a job has requested more than 1
    license of a certain type.
 -- Fix bug in PMIX_Ring in the pmi2 plugin so that it supports singleton mode.
    It also updates the testpmixring.c test program so it can be used to check
    singleton runs.
 -- Automically cleanup task/cgroup cpuset and devices cgroups after steps are
    done.
 -- Testsuite - Fix test1.83 to handle gaps in node names properly.
 -- BlueGene - correctly scale node counts when enforcing MaxNodes limit.
 -- Make sure no attempt is made to schedule a requeued job until all steps are
    cleaned (Node Health Check completes for all steps on a Cray).
 -- KNL: Correct task affinity logic for some NUMA modes.
 -- Add salloc/sbatch/srun --priority option of "TOP" to set job priority to
    the highest possible value. This option is only available to Slurm operators
    and administrators.
 -- Add salloc/sbatch/srun option --use-min-nodes to prefer smaller node counts
    when a range of node counts is specified (e.g. "-N 2-4").
 -- Validate salloc/sbatch --wait-all-nodes argument.
 -- Add "sbatch_wait_nodes" to SchedulerParameters to control default sbatch
    behaviour with respect to waiting for all allocated nodes to be ready for
    use. Job can override the configuration option using the --wait-all-nodes=#
    option.
 -- Prevent partition group access updates from resetting last_part_update when
    no changes have been made. Prevents backfill scheduler from restarting
    mid-cycle unnecessarily.
 -- Cray - add NHC_ABSOLUTELY_NO to never run NHC, even on certain edge cases
    that it would otherwise be run on with NHC_NO.
 -- Ignore GRES/QOS updates that maintain the same value as before.
 -- mpi/pmix - prepare temp directory for application.
 -- Fix display for the nice and priority values in sprio/scontrol/squeue.

* Changes in Slurm 16.05.4
==========================
 -- Fix potential deadlock if running with message aggregation.
 -- Streamline when schedule() is called when running with message aggregation
    on batch script completes.
 -- Fix incorrect casting when [un]packing derived_ec on slurmdb_job_rec_t.
 -- Document that persistent burst buffers can not be created or destroyed using
    the salloc or srun --bb options.
 -- Add support for setting the SLURM_JOB_ACCOUNT, SLURM_JOB_QOS and
    SLURM_JOB_RESERVAION environment variables are set for the salloc command.
    Document the same environment variables for the salloc, sbatch and srun
    commands in their man pages.
 -- Fix issue where sacctmgr load cluster.cfg wouldn't load associations
    that had a partition in them.
 -- Don't return the extern step from sstat by default.
 -- In sstat print 'extern' instead of 4294967295 for the extern step.
 -- Make advanced reservations work properly with core specialization.
 -- Fix race condition in the account_gather plugin that could result in job
    stuck in COMPLETING state.
 -- Regression test fixes if SelectTypePlugin not managing memory and no node
    memory size set (defaults to 1 MB per node).
 -- Add missing partition write locks to _slurm_rpc_dump_nodes/node_single to
    prevent a race condition leading to inconsistent sinfo results.
 -- Fix task:CPU binding logic for some processors. This bug was introduced
    in version 16.05.1 to address KNL bunding problem.
 -- Fix two minor memory leaks in slurmctld.
 -- Improve partition-specific limit logging from slurmctld daemon.
 -- Fix incorrect access check when using MaxNodes setting on the partition.
 -- Fix issue with sacctmgr when specifying a list of clusters to query.
 -- Fix issue when calculating future StartTime for a job.
 -- Make EnforcePartLimit support logic work with any ordering of partitions
    in job submit request.
 -- Prevent restoration of wrong CPU governor and frequency when using
    multiple task plugins.
 -- Prevent slurmd abort if hwloc library fails to populate the "children"
    arrays (observed with hwloc version "dev-333-g85ea6e4").
 -- burst_buffer/cray: Add "--groupid" to DataWarp "setup" command.
 -- Fix lustre profiling putting it in the Filesystem dataset instead of the
    Network dataset.
 -- Fix profiling documentation and code to match be consistent with
    Filesystem instead of Lustre.
 -- Correct the way watts is calculated in the rapl plugin when using a poll
    frequency other than AcctGatherNodeFreq.
 -- Don't about step launch if job reaches expected end time while node is
    configuring/booting (NOTE: The job end time will be adjusted after node
    becomes ready for use).
 -- Fix several print routines to respect a custom output delimiter when
    printing NO_VAL or INFINITE.
 -- Correct documented configurations where --ntasks-per-core and
    --ntasks-per-socket are supported.
 -- task/affinity plugin buffer allocated too small, can corrupt memory.

* Changes in Slurm 16.05.3
==========================
 -- Make it so the extern step uses a reverse tree when cleaning up.
 -- If extern step doesn't get added into the proctrack plugin make sure the
    sleep is killed.
 -- Fix areas the slurmctld can segfault if an extern step is in the system
    cleaning up on a restart.
 -- Prevent possible incorrect counting of GRES of a given type if a node has
    the multiple "types" of a given GRES "name", which could over-subscribe
    GRES of a given type.
 -- Add web links to Slurm Diamond Collectors (from Harvard University) and
    collectd (from EDF).
 -- Add job_submit plugin for the "reboot" field.
 -- Make some more Slurm constants (INFINITE, NO_VAL64, etc.) available to
    job_submit/lua plugins.
 -- Send in a -1 for a taskid into spank_task_post_fork for the extern_step.
 -- MYSQL - Sightly better logic if a job completion comes in with an end time
    of 0.
 -- task/cgroup plugin is configured with ConstrainRAMSpace=yes, then set soft
    memory limit to allocated memory limit (previously no soft limit was set).
 -- Document limitations in burst buffer use by the salloc command (possible
    access problems from a login node).
 -- Fix proctrack plugin to only add the pid of a process once
    (regression in 16.05.2).
 -- Fix for sstat to print correct info when requesting jobid.batch as part of
    a comma-separated list.
 -- CRAY - Fix issue if pid has already been added to another job container.
 -- CRAY - Fix add of extern step to AELD.
 -- burstbufer/cray: avoid batch submit error condition if waiting for stagein.
 -- CRAY - Fix for reporting steps lingering after they are already finished.
 -- Testsuite - fix test1.29 / 17.15 for limits with values above 32-bits.
 -- CRAY - Simplify when a NHC is called on a step that has unkillable
    processes.
 -- CRAY - If trying to kill a step and you have NHC_NO_STEPS set run NHC
    anyway to attempt to log the backtraces of the potential
    unkillable processes.
 -- Fix gang scheduling and license release logic if single node job killed on
    bad node.
 -- Make scontrol show steps show the extern step correctly.
 -- Do not scheduled powered down nodes in FAILED state.
 -- Do not start slurmctld power_save thread until partition information is read
    in order to prevent race condition that can result invalid pointer when
    trying to resolve configured SuspendExcParts.
 -- Add SLURM_PENDING_STEP id so it won't be confused with SLURM_EXTERN_CONT.
 -- Fix for core selection with job --gres-flags=enforce-binding option.
    Previous logic would in some cases allocate a job zero cores, resulting in
    slurmctld abort.
 -- Minimize preempted jobs for configurations with multiple jobs per node.
 -- Improve partition AllowGroups caching. Update the table of UIDs permitted to
    use a partition based upon it's AllowGroups configuration parameter as new
    valid UIDs are found rather than looking up that user's group information
    for every job they submit. If the user is now allowed to use the partition,
    then do not check that user's group access again for 5 seconds.
 -- Add routing queue information to Slurm FAQ web page.
 -- Do not select_g_step_finish() a SLURM_PENDING_STEP step, as nothing has
    been allocated for the step yet.
 -- Fixed race condition in PMIx Fence logic.
 -- Prevent slurmctld abort if job is killed or requeued while waiting for
    reboot of its allocated compute nodes.
 -- Treat invalid user ID in AllowUserBoot option of knl.conf file as error
    rather than fatal (log and do not exit).
 -- qsub - When doing the default output files for an array in qsub style
    make them using the master job ID instead of the normal job ID.
 -- Create the extern step while creating the job instead of waiting until the
    end of the job to do it.
 -- Always report a 0 exit code for the extern step instead of being canceled
    or failed based on the signal that would always be killing it.
 -- Fix to allow users to update QOS of pending jobs.
 -- CRAY - Fix minor memory leak in switch plugin.
 -- CRAY - Change slurmconfgen_smw.py to skip over disabled nodes.
 -- Fix eligible_time for elasticsearch as well as add queue_wait
    (difference between start of job and when it was eligible).


* Changes in Slurm 16.05.2
==========================
 -- CRAY - Fix issue where the proctrack plugin could hang if the container
    id wasn't able to be made.
 -- Move test for job wait reason value of BurstBufferResources and
    BurstBufferStageIn later in the scheduling logic.
 -- Document which srun options apply to only job, only step, or job and step
    allocations.
 -- Use more compatible function to get thread name (>= 2.6.11).
 -- Fix order of job then step id when noting cleaning flag being set.
 -- Make it so the extern step sends a message with accounting information
    back to the slurmctld.
 -- Make it so the extern step calls the select_g_step_start|finish functions.
 -- Don't print error when extern step is canceled because job is ending.
 -- Handle a few error codes when dealing with the extern step to make sure
    we have the pids added to the system correctly.
 -- Add support for job dependencies with job array expressions. Previous logic
    required listing each task of job array individually.
 -- Make sure tres_cnt is set before creating a slurmdb_assoc_usage_t.
 -- Prevent backfill scheduler from starting a second "singleton" job if another
    one started during a backfill sleep.
 -- Fix for invalid array pointer when creating advanced reservation when job
    allocations span heterogeneous nodes (differing core or socket counts).
 -- Fix hostlist_ranged_string_xmalloc_dims to correctly not put brackets on
    hostlists when brackets == 0.
 -- Make sure we don't get brackets when making a range of reserved ports
    for a step.
 -- Change fatal to an error if port ranges aren't correct when reading state
    for steps.

* Changes in Slurm 16.05.1
==========================
 -- Fix __cplusplus macro in spank.h to allow compilation with C++.
 -- Fix compile issue with older glibc < 2.12
 -- Fix for starting batch step with mpi/pmix plugin.
 -- Fix for "scontrol -dd show job" with respect to displaying the specific
    CPUs allocated to a job on each node. Prior logic would only display
    the CPU information for the first node in the job allocation.
 -- Print correct return code on failure to update active node features
    through sview.
 -- Allow QOS timelimit to override partition timelimit when EnforcePartLimits
    is set to all/any.
 -- Make it so qsub will do a "basename" on a wrapped command for the output
    and error files.
 -- Fix issue where slurmd could core when running the ipmi energy plugin.
 -- Documentation - clean up typos.
 -- Add logic so that slurmstepd can be launched under valgrind.
 -- Increase buffer size to read /proc/*/stat files.
 -- Fix for tracking job resource allocation when slurmctld is reconfigured
    while Cray Node Health Check (NHC) is running. Previous logic would fail to
    record the job's allocation then perform release operation upon NHC
    completion, resulting in underflow error messages.
 -- Make "scontrol show daemons" work with long node names.
 -- CRAY - Collect energy using a uint64_t instead of uint32_t.
 -- Fix incorrect if statements when determining if the user has a default
    account or wckey.
 -- Prevent job stuck in configuring state if slurmctld daemon restarted while
    PrologSlurmctld is running. Also re-issue burst_buffer/pre-load operation
    as needed.
 -- Correct task affinity support for FreeBSD.
 -- Fix for task affinity on KNL in SNC2/Flat mode.
 -- Recalculate a job's memory allocation after node reboot if job requests all
    of a node's memory and FastSchedule=0 is configured. Intel KNL memory size
    can change on reboot with various MCDRAM modes.
 -- Fix small memory leak when printing HealthCheckNodeState.
 -- Eliminate memory leaks when AuthInfo is configured.
 -- Improve sdiag output description in man page.
 -- Cray/capmc_resume script modify a node's features (as needed) when the
    reinit (reboot) command is issued rather than wait for the nodes to change
    to the "on" state.
 -- Correctly print ranges when using step values in job arrays.
 -- Allow from file names / paths over 256 characters when launching steps,
    as well as spaces in the executable name.
 -- job_submit.license.lua example modified to send message back to user.
 -- Document job --mem=0 option means all memory on a node.
 -- Set SLURM_JOB_QOS environment variable to QOS name instead of description.
 -- knl_cray.conf file option of CnselectPath added.
 -- node_features/knl_cray plugin modified to get current node NUMA and MCDRAM
    modes using cnselect command rather than capmc command.
 -- liblua - add SLES12 paths to runtime search list.
 -- Fix qsub default output and error files for task arrays.
 -- Fix qsub to set job_name correctly when wrapping a script (-b y)
 -- Cray - set EnforcePartLimits=any in slurm.conf template.

* Changes in Slurm 16.05.0
==========================
 -- Update seff to fix warnings with ncpus, and list slurm-perlapi dependency
    in spec file.
 -- Fix testsuite to consistent use /usr/bin/env {bash,expect} construct.
 -- Cray - Ensure that step completion messages get to the database.
 -- Fix step cpus_per_task calculation for heterogeneous job allocation.
 -- Fix --with-json= configure option to use specified path.
 -- Add back thread_id to "thread_id" LogTimeFormat to distinguish between
    mutliple threads with the same name. Now displays thread name and id.
 -- Change how Slurm determines the NUMA count of a node. Ignore KNL NUMA
    that only include memory.
 -- Cray - Fix node list parsing in capmc_suspend/resume programs.
 -- Fix sbatch #BSUB parsing for -W and -M options.
 -- Fix GRES task layout bug that could cause slurmctld to abort.
 -- Fix to --gres-flags=enforce-binding logic when multiple sockets needed.

* Changes in Slurm 16.05.0rc2
=============================
 -- Cray node shutdown/reboot scripts, perform operations on all nodes in one
    capmc command. Only if that fails, issue the operations in parallel on
    individual nodes. Required for scalability.
 -- Cleanup two minor Coverity warnings.
 -- Make it so the tres units in a job's formatted string are converted like
    they are in a step.
 -- Correct partition's MaxCPUsPerNode enforcement when nodes are shared by
    multiple partitions.
 -- node_feature/knl_cray - Prevent slurmctld GRES errors for "hbm" references.
 -- Display thread name instead of thread id and remove process name in stderr
    logging for "thread_id" LogTimeFormat.
 -- Log IP address of bad incomming message to slurmctld.
 -- If a user requests tasks, nodes and ntasks-per-node and
    tasks-per-node/nodes != tasks print warning and ignore ntasks-per-node.
 -- Release CPU "owner" file locks.
 -- Fix for job step memory allocation: Reject invalid step at submit time
    rather than leaving it queued.
 -- Whenever possible, avoid allocating nodes that require a reboot.

* Changes in Slurm 16.05.0rc1
==============================
 -- Remove the SchedulerParameters option of "assoc_limit_continue", making it
    the default value. Add option of "assoc_limit_stop". If "assoc_limit_stop"
    is set and a job cannot start due to association limits, then do not attempt
    to initiate any lower priority jobs in that partition. Setting this can
    decrease system throughput and utlization, but avoid potentially starving
    larger jobs by preventing them from launching indefinitely.
 -- Update a node's socket and cores per socket counts as needed after a node
    boot to reflect configuration changes which can occur on KNL processors.
    Note that the node's total core count must not change, only the distribution
    of cores across varying socket counts (KNL NUMA nodes treated as sockets by
    Slurm).
 -- Rename partition configuration from "Shared" to "OverSubscribe". Rename
    salloc, sbatch, srun option from "--shared" to "--oversubscribe". The old
    options will continue to function. Output field names also changed in
    scontrol, sinfo, squeue and sview.
 -- Add SLURM_UMASK environment variable to user job.
 -- knl_conf: Added new configuration parameter of CapmcPollFreq.
 -- squeue: remove errant spaces in column formats for "squeue -o %all".
 -- Add ARRAY_TASKS mail option to send emails to each task in a job array.
 -- Change default compression library for sbcast to lz4.
 -- select/cray - Initiate step node health check at start of step termination
    rather than after application completely ends so that NHC can capture
    information about hung (non-killable) processes.
 -- Add --units=[KMGTP] option to sacct to display values in specific unit type.
 -- Modify sacct and sacctmgr to display TRES values in converted units.
 -- Modify sacctmgr to accept TRES values with [KMGTP] suffixes.
 -- Replace hash function with more modern SipHash functions.
 -- Add "--with-cray_dir" build/configure option.
 -- BB- Only send stage_out email when stage_out is set in script.
 -- Add r/w locking to file_bcast receive functions in slurmd.
 -- Add TopologyParam option of "TopoOptional" to optimize network topology
    only for jobs requesting it.
 -- Fix build on FreeBSD.
 -- Configuration parameter "CpuFreqDef" used to set default governor for job
    step not specifying --cpu-freq (previously the parameter was unused).
 -- Fix sshare -o<format> to correctly display new lengths.
 -- Update documentation to rename Shared option to OverSubscribe.
 -- Update documentation to rename partition Priority option to PriorityTier.
 -- Prevent changing of QOS on running jobs.
 -- Update accounting when changing QOS on pending jobs.
 -- Add support to ntasks_per_socket in task/affinity.
 -- Generate init.d and systemd service scripts in etc/ through Make rather
    than at configure time to ensure all variable substitutions happen.
 -- Use TaskPluginParam for default task binding if no user specified CPU
    binding. User --cpu_bind option takes precident over default. No longer
    any error if user --cpu_bind option does not match TaskPluginParam.
 -- Make sacct and sattach work with older slurmd versions.
 -- Fix protocol handling between 15.08 and 16.05 for 'scontrol show config'.
 -- Enable prefixes (e.g. info, debug, etc.) in slurmstepd debugging.

* Changes in Slurm 16.05.0pre2
==============================
 -- Split partition's "Priority" field into "PriorityTier" (used to order
    partitions for scheduling and preemption) plus "PriorityJobFactor" (used by
    priority/multifactor plugin in calculating job priority, which is used to
    order jobs within a partition for scheduling).
 -- Revert call to getaddrinfo, restoring gethostbyaddr (introduced in Slurm
    16.05.0pre1) which was failing on some systems.
 -- knl_cray.conf - Added AllowMCDRAM, AllowNUMA and ALlowUserBoot
    configuration options.
 -- Add node_features_p_user_update() function to node_features plugin.
 -- Don't print Weight=1 lines in 'scontrol write config' (its the default).
 -- Remove PARAMS macro from slurm.h.
 -- Remove BEGIN_C_DECLS and END_C_DECLS macros.
 -- Check that PowerSave mode configured for node_features/knl_cray plugin.
    It is required to reconfigure and reboot nodes.
 -- Update documentation to reflect new cgroup default location change from
    /cgroup to /sys/fs/cgroup.
 -- If NodeHealthCheckProgram configured HealthCheckInterval is non-zero, then
    modify slurmd to run it before registering with slurmctld.
 -- Fix for tasks being packed onto cores when the requested --cpus-per-task is
    greater than the number of threads on a core and --ntasks-per-core is 1.
 -- Make it so jobs/steps track ':' named gres/tres, before hand gres/gpu:tesla
    would only track gres/gpu, now it will track both gres/gpu and
    gres/gpu:tesla as separate gres if configured like
    AccountingStorageTRES=gres/gpu,gres/gpu:tesla
 -- Added new job dependency type of "aftercorr" which will start a task of a
    job array after the corresponding task of another job array completes.
 -- Increase default MaxTasksPerNode configuration parameter from 128 to 512.
 -- Enable sbcast data compression logic (compress option previously ignored).
 -- Add --compress option to srun command for use with --bcast option.
 -- Add TCPTimeout option to slurm[dbd].conf. Decouples MessageTimeout from TCP
    connections.
 -- Don't call primary controller for every RPC when backup is in control.
 -- Add --gres-flags=enforce-binding option to salloc, sbatch and srun commands.
    If set, the only CPUs available to the job will be those bound to the
    selected GRES (i.e. the CPUs identifed in the gres.conf file will be
    strictly enforced rather than advisory).
 -- Change how a node's allocated CPU count is calculated to avoid double
    counting CPUs allocated to multiple jobs at the same time.
 -- Added SchedulingParameters option of "bf_min_prio_reserve". Jobs below
    the specified threshold will not have resources reserved for them.
 -- Added "sacctmgr show lostjobs" to report any orphaned jobs in the database.
 -- When a stepd is about to shutdown and send it's response to srun
    make the wait to return data only hit after 500 nodes and configurable
    based on the TcpTimeout value.
 -- Add functionality to reset the lft and rgt values of the association table
    with the slurmdbd.
 -- Add SchedulerParameter no_env_cache, if set no env cache will be use when
    launching a job, instead the job will fail and drain the node if the env
    isn't loaded normally.

* Changes in Slurm 16.05.0pre1
==============================
 -- Add sbatch "--wait" option that waits for job completion before exiting.
    Exit code will match that of spawned job.
 -- Modify advanced reservation save/restore logic for core reservations to
    support configuration changes (changes in configured nodes or cores counts).
 -- Allow ControlMachine, BackupController, DbdHost and DbdBackupHost to be
    either short or long hostname.
 -- Job output and error files can now contain "%" character by specifying
    a file name with two consecutive "%" characters. For example,
    "sbatch -o "slurm.%%.%j" for job ID 123 will generate an output file named
    "slurm.%.123".
 -- Pass user name in Prolog RPC from controller to slurmd when using
    PrologFlags=Alloc. Allows SLURM_JOB_USER env variable to be set when using
    Native Slurm on a Cray.
 -- Add "NumTasks" to job information visible to Slurm commands.
 -- Add mail wrapper script "smail" that will include job statistics in email
    notification messages.
 -- Remove vestigial "SICP" job option (inter-cluster job option). Completely
    different logic will be forthcoming.
 -- Fix case where the primary and backup dbds would both be performing rollup.
 -- Add an ack reply from slurmd to slurmstepd when job setup is done and the
    job is ready to be executed.
 -- Removed support for authd. authd has not been developed and supported since
    several years. 
 -- Introduce a new parameter requeue_setup_env_fail in SchedulerParameters.
    A job that fails to setup the environment will be requeued and the node
    drained.
 -- Add ValidateTimeout and OtherTimeout to "scontrol show burst" output.
 -- Increase default sbcast buffer size from 512KB to 8MB.
 -- Enable the hdf5 profiling of the batch step.
 -- Eliminate redundant environment and script files for job arrays.
 -- Stop searching sbatch scripts for #PBS directives after 100 lines of
    non-comments. Stop parsing #PBS or #SLURM directives after 1024 characters
    into a line. Required for decent perforamnce with huge scripts.
 -- Add debug flag for timing Cray portions of the code.
 -- Remove all *.la files from RPMs.
 -- Add Multi-Category Security (MCS) infrastructure to permit nodes to be bound
    to specific users or groups.
 -- Install the pmi2 unix sockets in slurmd spool directory instead of /tmp.
 -- Implement the getaddrinfo and getnameinfo instead of gethostbyaddr and
    gethostbyname.
 -- Finished PMIx implementation.
 -- Implemented the --without=package option for configure.
 -- Fix sshare to show each individual cluster with -M,--clusters option.
 -- Added --deadline option to salloc, sbatch and srun. Jobs which can not be
    completed by the user specified deadline will be terminated with a state of
    "Deadline" or "DL".
 -- Implemented and documented PMIX protocol which is used to bootstrap an
    MPI job. PMIX is an alternative to PMI and PMI2.
 -- Change default CgroupMountpoint (in cgroup.conf) from "/cgroup" to
    "/sys/fs/cgroup" to match current standard.
 -- Add #BSUB options to sbatch to read in from the batch script.
 -- HDF: Change group name of node from nodename to nodeid.
 -- The partition-specific SelectTypeParameters parameter can now be used to
    change the memory allocation tracking specification in the global
    SelectTypeParameters configuration parameter. Supported partition-specific
    values are CR_Core, CR_Core_Memory, CR_Socket and CR_Socket_Memory. If the
    global SelectTypeParameters value includes memory allocation management and
    the partition-specific value does not, then memory allocation management for
    that partition will NOT be supported (i.e. memory can be over-allocated).
    Likewise the global SelectTypeParameters might not include memory management
    while the partition-specific value does.
 -- Burst buffer/cray - Add support for multiple buffer pools including support
    for different resource granularity by pool.
 -- Burst buffer advanced reservation units treated as bytes (per documentation)
    rather than GB.
 -- Add an "scontrol top <jobid>" command to re-order the priorities of a user's
    pending jobs. May be disabled with the "disable_user_top" option in the
    SchedulerParameters configuration parameter.
 -- Modify sview to display negative job nice values.
 -- Increase job's nice value field from 16 to 32 bits.
 -- Remove deprecated job_submit/cnode plugin.
 -- Enhance slurm.conf option EnforcePartLimit to include options like "ANY" and
    "ALL".  "Any" is equivalent to "Yes" and "All" will check all partitions
    a job is submitted to and if any partition limit is violated the job will
    be rejected even if it could possibly run on another partition.
 -- Add "features_act" field (currently active features) to the node
    information. Output of scontrol, sinfo, and sview changed accordingly.
    The field previously displayed as "Features" is now "AvailableFeatures"
    while the new field is displayed as "ActiveFeatures".
 -- Remove Sun Constellation, IBM Federation Switches (replaced by NRT switch
    plugin) and long-defunct Quadrics Elan support.
 -- Add -M<clusters> option to sreport.
 -- Rework group caching to work better in environments with
    enumeration disabled. Removed CacheGroups config directive, group
    membership lists are now always cached, controlled by
    GroupUpdateTime parameter. GroupUpdateForce parameter default
    value changed to 1.
 -- Add reservation flag of "purge_comp" which will purge an advanced
    reservation once it has no more active (pending, suspended or running) jobs.
 -- Add new configuration parameter "KNLPlugins" and plugin infrastructure.
 -- Add optional job "features" to node reboot RPC.
 -- Add slurmd "-b" option to report node rebooted at daemon start time. Used
    for testing purposes.
 -- contribs/cray: Add framework for powering nodes up and down.
 -- For job constraint, convert comma separator to "&".
 -- Add Max*PerAccount options for QOS.
 -- Protect slurm_mutex_* calls with abort() on failure.

* Changes in Slurm 15.08.13
===========================
 -- Fix issue where slurmd could core when running the ipmi energy plugin.
 -- Print correct return code on failure to update node features through sview.
 -- Documentation - cleanup typos.
 -- Add logic so that slurmstepd can be launched under valgrind.
 -- Increase buffer size to read /proc/*/stat files.
 -- MYSQL - Handle ER_HOST_IS_BLOCKED better by failing when it occurs instead
    of continuously printing the message over and over as the problem will
    most likely not resolve itself.
 -- Add --disable-bluegene to configure.  This will make it so Slurm
    can work on a BGAS node.
 -- Prevent job stuck in configuring state if slurmctld daemon restarted while
    PrologSlurmctld is running.
 -- Handle association correctly if using FAIR_TREE as well as shares=Parent
 -- Fix race condition when setting priority of a job and the association
    doesn't have a parent.
 -- MYSQL - Fix issue with adding a reservation if the name has single quotes in
    it.
 -- Correctly print ranges when using step values in job arrays.
 -- Fix for invalid array pointer when creating advanced reservation when job
    allocations span heterogeneous nodes (differing core or socket counts).
 -- Fix for sstat to print correct info when requesting jobid.batch as part of
    a comma-separated list.
 -- Cray - Fix issue restoring jobs when blade count increases due to hardware
    reconfiguration.
 -- Ignore warnings about depricated functions. This is primarily there for
    new glibc 2.24+ that depricates readdir_r.

* Changes in Slurm 15.08.12
===========================
 -- Do not attempt to power down a node which has never responded if the
    slurmctld daemon restarts without state.
 -- Fix for possible slurmstepd segfault on invalid user ID.
 -- MySQL - Fix for possible race condition when archiving multiple clusters
    at the same time.
 -- Fix compile for when you don't have hwloc.
 -- Fix issue where daemons would only listen on specific address given in
    slurm.conf instead of all.  If looking for specific addresses use
    TopologyParam options No*InAddrAny.
 -- Cray - Better robustness when dealing with the aeld interface.
 -- job_submit.lua - add array_inx value for job arrays.
 -- Perlapi - Remove unneeded/undefined mutex.
 -- Fix issue when TopologyParam=NoInAddrAny is set the responses wouldn't
    make it to the slurmctld when using message aggregation.
 -- MySQL - Fix potential memory leak when rolling up data.
 -- Fix issue with clustername file when running on NFS with root_squash.
 -- Fix race condition with respects to cleaning up the profiling threads
    when in use.
 -- Fix issues when building on NetBSD.
 -- Fix jobcomp/elasticsearch build when libcurl is installed in a
    non-standard location.
 -- Fix MemSpecLimit to explicitly require TaskPlugin=task/cgroup and
    ConstrainRAMSpace set in cgroup.conf.
 -- MYSQL - Fix order of operations issue where if the database is locked up
    and the slurmctld doesn't wait long enough for the response it would give
    up leaving the connection open and create a situation where the next message
    sent could receive the response of the first one.
 -- Fix CFULL_BLOCK distribution type.
 -- Prevent sbatch from trying to enable debug messages when using job arrays.
 -- Prevent sbcast from enabling "--preserve" when specifying a jobid.
 -- Prevent wrong error message from spank plugin stack on GLOB_NOSPACE error.
 -- Fix proctrack/lua plugin to prevent possible deadlock.
 -- Prevent infinite loop in slurmstepd if execve fails.
 -- Prevent multiple responses to REQUEST_UPDATE_JOB_STEP message.
 -- Prevent possible deadlock in acct_gather_filesystem/lustre on error.
 -- Make it so --mail-type=NONE didn't throw an invalid error.
 -- If no default account is given for a user when creating (only a list of
    accounts) no default account is printed, previously NULL was printed.
 -- Fix for tracking a node's allocated CPUs with gang scheduling.
 -- Fix Hidden error during _rpc_forward_data call.
 -- Fix bug resulting from wrong order-of-operations in _connect_srun_cr(),
    and two others that cause incorrect debug messages.
 -- Fix backwards compatibility with sreport going to <= 14.11 coming from
    >= 15.08 for some reports.

* Changes in Slurm 15.08.11
===========================
 -- Fix for job "--contiguous" option that could cause job allocation/launch
    failure or slurmctld crash.
 -- Fix to setup logs for single-character program names correctly.
 -- Backfill scheduling performance enhancement with large number of running
    jobs.
 -- Reset job's prolog_running counter on slurmctld restart or reconfigure.
 -- burst_buffer/cray - Update job's prolog_running counter if pre_run fails.
 -- MYSQL - Make the error message more specific when removing a reservation
    and it doesn't meet basic requirements.
 -- burst_buffer/cray - Fix for script creating or deleting persistent buffer
    would fail "paths" operation and hold the job.
 -- power/cray - Prevent possible divide by zero.
 -- power/cray - Fix bug introduced in 15.08.10 preventin operation in many
    cases.
 -- Prevent deadlock for flow of data to the slurmdbd when sending reservation
    that wasn't set up correctly.
 -- burst_buffer/cray - Don't call Datawarp "paths" function if script includes
    only create or destroy of persistent burst buffer. Some versions of Datawarp
    software return an error for such scripts, causing the job to be held.
 -- Fix potential issue when adding and removing TRES which could result
    in the slurmdbd segfaulting.
 -- Add cast to memory limit calculation to prevent integer overflow for
    very large memory values.
 -- Bluegene - Fix issue with reservations resizing under the covers on a
    restart of the slurmctld.
 -- Avoid error message of "Requested cpu_bind option requires entire node to
    be allocated; disabling affinity" being generated in some cases where
    task/affinity and task/cgroup plugins used together.
 -- Fix version issue when packing GRES information between 2 different versions
    of Slurm.
 -- Fix for srun hanging with OpenMPI and PMIx
 -- Better initialization of node_ptr when dealing with protocol_version.
 -- Fix incorrect type when initializing header of a message.
 -- MYSQL - Fix incorrect usage of limit and union.
 -- MYSQL - Remove 'ignore' from alter ignore when updating a table.
 -- Documentation - update prolog_epilog page to reflect current behavior
    if the Prolog fails.
 -- Documentation - clarify behavior of 'srun --export=NONE' in man page.
 -- Fix potential gres underflow on restart of slurmctld.
 -- Fix sacctmgr to remove a user who has no associations.

* Changes in Slurm 15.08.10
===========================
 -- Fix issue where if a slurmdbd rollup lasted longer than 1 hour the
    rollup would effectively never run again.
 -- Make error message in the pmi2 code to debug as the issue can be expected
    and retries are done making the error message a little misleading.
 -- Power/cray: Don't specify NID list to Cray APIs. If any of those nodes are
    not in a ready state, the API returned an error for ALL nodes rather than
    valid data for nodes in ready state.
 -- Fix potential divide by zero when tree_width=1.
 -- checkpoint/blcr plugin: Fix memory leak.
 -- If using PrologFlags=contain: Don't launch the extern step if a job is
    cancelled while launching.
 -- Remove duplicates from AccountingStorageTRES
 -- Fix backfill scheduler race condition that could cause invalid pointer in
    select/cons_res plugin. Bug introduced in 15.08.9.
 -- Avoid double calculation on partition QOS if the job is using the same QOS.
 -- Do not change a job's time limit when updating unrelated field in a job.
 -- Fix situation on a heterogeneous memory cluster where the order of
    constraints mattered in a job.

* Changes in Slurm 15.08.9
==========================
 -- BurstBuffer/cray - Defer job cancellation or time limit while "pre-run"
    operation in progress to avoid inconsistent state due to multiple calls
    to job termination functions.
 -- Fix issue with resizing jobs and limits not be kept track of correctly.
 -- BGQ - Remove redeclaration of job_read_lock.
 -- BGQ - Tighter locks around structures when nodes/cables change state.
 -- Make it possible to change CPUsPerTask with scontrol.
 -- Make it so scontrol update part qos= will take away a partition QOS from
    a partition.
 -- Fix issue where SocketsPerBoard didn't translate to Sockets when CPUS=
    was also given.
 -- Add note to slurm.conf man page about setting "--cpu_bind=no" as part
    of SallocDefaultCommand if a TaskPlugin is in use.
 -- Set correct reason when a QOS' MaxTresMins is violated.
 -- Insure that a job is completely launched before trying to suspend it.
 -- Remove historical presentations and design notes. Only distribute
    maintained doc/html and doc/man directories.
 -- Remove duplicate xmalloc() in task/cgroup plugin.
 -- Backfill scheduler to validate correct job partition for job submitted to
    multiple partitions.
 -- Force close on exec on first 256 file descriptors when launching a
    slurmstepd to close potential open ones.
 -- Step GRES value changed from type "int" to "int64_t" to support larger
    values.
 -- Fix getting reservations to database when database is down.
 -- Fix issue with sbcast not doing a correct fanout.
 -- Fix issue where steps weren't always getting the gres/tres involved.
 -- Fixed double read lock on getting job's gres/tres.
 -- Fix display for RoutePlugin parameter to display the correct value.
 -- Fix route/topology plugin to prevent segfault in sbcast when in use.
 -- Fix Cray slurmconfgen_smw.py script to use nid as nid, not nic.
 -- Fix Cray NHC spawning on job requeue. Previous logic would leave nodes
    allocated to a requeued job as non-usable on job termination.
 -- burst_buffer/cray plugin: Prevent a requeued job from being restarted while
    file stage-out is still in progress. Previous logic could restart the job
    and not perform a new stage-in.
 -- Fix job array formatting to allow return [0-100:2] display for arrays with
    step functions rather than [0,2,4,6,8,...] .
 -- FreeBSD - replace Linux-specific set_oom_adj to avoid errors in slurmd log.
 -- Add option for TopologyParam=NoInAddrAnyCtld to make the slurmctld listen
    on only one port like TopologyParam=NoInAddrAny does for everything else.
 -- Fix burst buffer plugin to prevent corruption of the CPU TRES data when bb
    is not set as an AccountingStorageTRES type.
 -- Surpress error messages in acct_gather_energy/ipmi plugin after repeated
    failures.
 -- Change burst buffer use completion email message from
    "SLURM Job_id=1360353 Name=tmp Staged Out, StageOut time 00:01:47" to
    "SLURM Job_id=1360353 Name=tmp StageOut/Teardown time 00:01:47"
 -- Generate burst buffer use completion email immediately afer teardown
    completes rather than at job purge time (likely minutes later).
 -- Fix issue when adding a new TRES to AccountingStorageTRES for the first
    time.
 -- Update gang scheduling tables when job manually suspended or resumed. Prior
    logic could mess up job suspend/resume sequencing.
 -- Update gang scheduling data structures when job changes in size.
 -- Associations - prevent hash table corruption if uid initially unset for
    a user, which can cause slurmctld to crash if that user is deleted.
 -- Avoid possibly aborting srun on SIGSTOP while creating the job step due to
    threading bug.
 -- Fix deadlock issue with burst_buffer/cray when a newly created burst
    buffer is found.
 -- burst_buffer/cray: Set environment variables just before starting job rather
    than at job submission time to reflect persistent buffers created or
    modified while the job is pending.
 -- Fix check of per-user qos limits on the initial run by a user.
 -- Fix gang scheduling resource selection bug which could prevent multiple jobs
    from being allocated the same resources. Bug was introduced in 15.08.6.
 -- Don't print the Rgt value of an association from the cache as it isn't
    kept up to date.
 -- burst_buffer/cray - If the pre-run operation fails then don't issue
    duplicate job cancel/requeue unless the job is still in run state. Prevents
    jobs hung in COMPLETING state.
 -- task/cgroup - Fix bug in task binding to CPUs.

* Changes in Slurm 15.08.8
==========================
 -- Backfill scheduling properly synchronized with Cray Node Health Check.
    Prior logic could result in highest priority job getting improperly
    postponed.
 -- Make it so daemons also support TopologyParam=NoInAddrAny.
 -- If scancel is operating on large number of jobs and RPC responses from
    slurmctld daemon are slow then introduce a delay in sending the cancel job
    requests from scancel in order to reduce load on slurmctld.
 -- Remove redundant logic when updating a job's task count.