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 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.

* 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.
 -- MySQL - Fix querying jobs with reservations when the id's have rolled.
 -- Perl - Fix use of uninitialized variable in slurm_job_step_get_pids.
 -- Launch batch job requsting --reboot after the boot completes.
 -- Move debug messages like "not the right user" from association manager
    to debug3 when trying to find the correct association.
 -- Fix incorrect logic when querying assoc_mgr information.
 -- Move debug messages to debug3 notifying a gres_bit_alloc was NULL for
    gres types without a file.
 -- Sanity Check Patch to setup variables for RAPL if in a race for it.
 -- GRES - Fix minor typecast issues.
 -- burst_buffer/cray - Increase size of intermediate variable used to store
    buffer byte size read from DW instance from 32 to 64-bits to avoid overflow
    and reporting invalid buffer sizes.
 -- Allow an existing reservation with running jobs to be modified without
    Flags=IGNORE_JOBS.
 -- srun - don't attempt to execve() a directory with a name matching the
    requested command
 -- Do not automatically relocate an advanced reservation for individual cores
    that spans multiple nodes when nodes in that reservation go down (e.g.
    a 1 core reservation on node "tux1" will be moved if node "tux1" goes
    down, but a reservation containing 2 cores on node "tux1" and 3 cores on
    "tux2" will not be moved node "tux1" goes down). Advanced reservations for
    whole nodes will be moved by default for down nodes.
 -- Avoid possible double free of memory (and likely abort) for slurmctld in
    background mode.
 -- contribs/cray/csm/slurmconfgen_smw.py - avoid including repurposed compute
    nodes in configs.
 -- Support AuthInfo in slurmdbd.conf that is different from the value in
    slurm.conf.
 -- Fix build on FreeBSD 10.
 -- Fix hdf5 build on ppc64 by using correct fprintf formatting for types.
 -- Fix cosmetic printing of NO_VALs in scontrol show assoc_mgr.
 -- Fix perl api for newer perl versions.
 -- Fix for jobs requesting cpus-per-task (eg. -c3) that exceed the number of
    cpus on a core.
 -- Remove unneeded perl files from the .spec file.
 -- Flesh out filters for scontrol show assoc_mgr.
 -- Add function to remove assoc_mgr_info_request_t members without freeing
    structure.
 -- Fix build on some non-glibc systems by updating includes.
 -- Add new PowerParameters options of get_timeout and set_timeout. The default
    set_timeout was increased from 5 seconds to 30 seconds. Also re-read current
    power caps periodically or after any failed "set" operation.
 -- Fix slurmdbd segfault when listing users with blank user condition.
 -- Save the ClusterName to a file in SaveStateLocation, and use that to
    verify the state directory belongs to the given cluster at startup to avoid
    corruption from multiple clusters attempting to share a state directory.
 -- MYSQL - Fix issue when rerolling monthly data to work off correct time
    period.  This would only hit you if you rerolled a 15.08 prior to this
    commit.
 -- If FastSchedule=0 is used make sure TRES are set up correctly in accounting.
 -- Fix sreport's truncation of columns with large TRES and not using
    a parsing option.
 -- Make sure count of boards are restored when slurmctld has option -R.
 -- When determine if a job can fit into a TRES time limit after resources
    have been selected set the time limit appropriately if the job didn't
    request one.
 -- Fix inadequate locks when updating a partition's TRES.
 -- Add new assoc_limit_continue flag to SchedulerParameters.
 -- Avoid race in acct_gather_energy_cray if energy requested before available.
 -- MYSQL - Avoid having multiple default accounts when a user is added to
    a new account and making it a default all at once.

* Changes in Slurm 15.08.7
==========================
 -- sched/backfill: If a job can not be started within the configured
    backfill_window, set it's start time to 0 (unknown) rather than the end
    of the backfill_window.
 -- Remove the 1024-character limit on lines in batch scripts.
 -- burst_buffer/cray: Round up swap size by configured granularity.
 -- select/cray: Log repeated aeld reconnects.
 -- task/affinity: Disable core-level task binding if more CPUs required than
    available cores.
 -- Preemption/gang scheduling: If a job is suspended at slurmctld restart or
    reconfiguration time, then leave it suspended rather than resume+suspend.
 -- Don't use lower weight nodes for job allocation when topology/tree used.
 -- BGQ - If a cable goes into error state remove the under lying block on
    a dynamic system and mark the block in error on a static/overlap system.
 -- BGQ - Fix regression in 9cc4ae8add7f where blocks would be deleted on
    static/overlap systems when some hardware issue happens when restarting
    the slurmctld.
 -- Log if CLOUD node configured without a resume/suspend program or suspend
    time.
 -- MYSQL - Better locking around g_qos_count which was previously unprotected.
 -- Correct size of buffer used for jobid2str to avoid truncation.
 -- Fix allocation/distribution of tasks across multiple nodes when
    --hint=nomultithread is requested.
 -- If a reservation's nodes value is "all" then track the current nodes in the
    system, even if those nodes change.
 -- Fix formatting if using "tree" option with sreport.
 -- Make it so sreport prints out a line for non-existent TRES instead of
    error message.
 -- Set job's reason to "Priority" when higher priority job in that partition
    (or reservation) can not start rather than leaving the reason set to
    "Resources".
 -- Fix memory corruption when a new non-generic TRES is added to the
    DBD for the first time.  The corruption is only noticed at shutdown.
 -- burst_buffer/cray - Improve tracking of allocated resources to handle race
    condition when reading state while buffer allocation is in progress.
 -- If a job is submitted only with -c option and numcpus is updated before
    the job starts update the cpus_per_task appropriately.
 -- Update salloc/sbatch/srun documentation to mention time granularity.
 -- Fixed memory leak when freeing assoc_mgr_info_msg_t.
 -- Prevent possible use of empty reservation core bitmap, causing abort.
 -- Remove unneeded pack32's from qos_rec when qos_rec is NULL.
 -- Make sacctmgr print MaxJobsPerUser when adding/altering a QOS.
 -- Correct dependency formatting to print array task ids if set.
 -- Update sacctmgr help with current QOS options.
 -- Update slurmstepd to initialize authentication before task launch.
 -- burst_cray/cray: Eliminate need for dedicated nodes.
 -- If no MsgAggregationParams is set don't set the internal string to
    anything.  The slurmd will process things correctly after the fact.
 -- Fix output from api when printing job step not found.
 -- Don't allow user specified reservation names to disrupt the normal
    reservation sequeuece numbering scheme.
 -- Fix scontrol to be able to accept TRES as an option when creating
    a reservation.
 -- contrib/torque/qstat.pl - return exit code of zero even with no records
    printed for 'qstat -u'.
 -- When a reservation is created or updated, compress user provided node names
    using hostlist functions (e.g. translate user input of "Nodes=tux1,tux2"
    into "Nodes=tux[1-2]").
 -- Change output routines for scontrol show partition/reservation to handle
    unexpectedly large strings.
 -- Add more partition fields to "scontrol write config" output file.
 -- Backfill scheduling fix: If a job can't be started due to a "group" resource
    limit, rather than reserve resources for it when the next job ends, don't
    reserve any resources for it.
 -- Avoid slurmstepd abort if malloc fails during accounting gather operation.
 -- Fix nodes from being overallocated when allocation straddles multiple nodes.
 -- Fix memory leak in slurmctld job array logic.
 -- Prevent decrementing of TRESRunMins when AccountingStorageEnforce=limits is
    not set.
 -- Fix backfill scheduling bug which could postpone the scheduling of jobs due
    to avoidance of nodes in COMPLETING state.
 -- Properly account for memory, CPUs and GRES when slurmctld is reconfigured
    while there is a suspended job. Previous logic would add the CPUs, but not
    memory or GPUs. This would result in underflow/overflow errors in select
    cons_res plugin.
 -- Strip flags from a job state in qstat wrapper before evaluating.
 -- Add missing job states from the qstat wrapper.

* Changes in Slurm 15.08.6
==========================
 -- In slurmctld log file, log duplicate job ID found by slurmd. Previously was
    being logged as prolog/epilog failure.
 -- If a job is requeued while in the process of being launch, remove it's
    job ID from slurmd's record of active jobs in order to avoid generating a
    duplicate job ID error when launched for the second time (which would
    drain the node).
 -- Cleanup messages when handling job script and environment variables in
    older directory structure formats.
 -- Prevent triggering gang scheduling within a partition if configured with
    PreemptType=partition_prio and PreemptMode=suspend,gang.
 -- Decrease parallelism in job cancel request to prevent denial of service
    when cancelling huge numbers of jobs.
 -- If all ephemeral ports are in use, try using other port numbers.
 -- Revert way lib lua is handled when doing a dlopen, fixing a regression in
    15.08.5.
 -- Set the debug level of the rmdir message in xcgroup_delete() to debug2.
 -- Fix the qstat wrapper when user is removed from the system but still
    has running jobs.
 -- Log the request to terminate a job at info level if DebugFlags includes
    the Steps keyword.
 -- Fix potential memory corruption in _slurm_rpc_epilog_complete as well as
    _slurm_rpc_complete_job_allocation.
 -- Fix cosmetic display of AccountingStorageEnforce option "nosteps" when
    in use.
 -- If a job can never be started due to unsatisfied job dependencies, report
    the full original job dependency specification rather than the dependencies
    remaining to be satisfied (typically NULL).
 -- Refactor logic to synchronize active batch jobs and their script/environment
    files, reducing overhead dramatically for large numbers of active jobs.
 -- Avoid hard-link/copy of script/environment files for job arrays. Use the
    master job record file for all tasks of the job array.
    NOTE: Job arrays submitted to Slurm version 15.08.6 or later will fail if
    the slurmctld daemon is downgraded to an earlier version of Slurm.
 -- Move slurmctld mail handler to separate thread for improved performance.
 -- Fix containment of adopted processes from pam_slurm_adopt.
 -- If a pending job array has multiple reasons for being in a pending state,
    then print all reasons in a comma separated list.

* Changes in Slurm 15.08.5
==========================
 -- Prevent "scontrol update job" from updating jobs that have already finished.
 -- Show requested TRES in "squeue -O tres" when job is pending.
 -- Backfill scheduler: Test association and QOS node limits before reserving
    resources for pending job.
 -- burst_buffer/cray: If teardown operations fails, sleep and retry.
 -- Clean up the external pids when using the PrologFlags=Contain feature
    and the job finishes.
 -- burst_buffer/cray: Support file staging when job lacks job-specific buffer
    (i.e. only persistent burst buffers).
 -- Added srun option of --bcast to copy executable file to compute nodes.
 -- Fix for advanced reservation of burst buffer space.
 -- BurstBuffer/cray: Add logic to terminate dw_wlm_cli child processes at
    shutdown.
 -- If job can't be launch or requeued, then terminate it.
 -- BurstBuffer/cray: Enable clearing of burst buffer string on completed job
    as a means of recovering from a failure mode.
 -- Fix wrong memory free when parsing SrunPortRange=0-0 configuration.
 -- BurstBuffer/cray: Fix job record purging if cancelled from pending state.
 -- BGQ - Handle database throw correctly when syncing users on blocks.
 -- MySQL - Make sure we don't have a NULL string returned when not
    requesting any specific association.
 -- sched/backfill: If max_rpc_cnt is configured and the backlog of RPCs has
    not cleared after yielding locks, then continue to sleep.
 -- Preserve the job dependency description displayed in 'scontrol show job'
    even if the dependee jobs was terminated and cleaned causing the
    dependent to never run because of DependencyNeverSatisfied.
 -- Correct job task count calculation if only node count and ntasks-per-node
    options supplied.
 -- Make sure the association manager converts any string to be lower case
    as all the associations from the database will be lower case.
 -- Sanity check for xcgroup_delete() to verify incoming parameter is valid.
 -- Fix formatting for sacct with variables that switched from uint32_t to
    uint64_t.
 -- Fix a typo in sacct man page.
 -- Set up extern step to track any children of an ssh if it leaves anything
    else behind.
 -- Prevent slurmdbd divide by zero if no associations defined at rollup time.
 -- Multifactor - Add sanity check to make sure pending jobs are handled
    correctly when PriorityFlags=CALCULATE_RUNNING is set.
 -- Add slurmdb_find_tres_count_in_string() to slurm db perl api.
 -- Make lua dlopen() conditional on version found at build.
 -- sched/backfill - Delay backfill scheduler for completing jobs only if
    CompleteWait configuration parameter is set (make code match documentation).
 -- Release a job's allocated licenses only after epilog runs on all nodes
    rather than at start of termination process.
 -- Cray job NHC delayed until after burst buffer released and epilog completes
    on all allocated nodes.
 -- Fix abort of srun if using PrologFlags=NoHold
 -- Let devices step_extern cgroup inherit attributes of job cgroup.
 -- Add new hook to Task plugin to be able to put adopted processes in the
    step_extern cgroups.
 -- Fix AllowUsers documentation in burst_buffer.conf man page. Usernames are
    comma separated, not colon delimited.
 -- Fix issue with time limit not being set correctly from a QOS when a job
    requests no time limit.
 -- Various CLANG fixes.
 -- In both sched/basic and backfill: If a job can not be started due to some
    account/qos limit, then don't start other jobs which could delay jobs. The
    old logic would skip the job and start other jobs, which could delay the
    higher priority job.
 -- select/cray: Prevent NHC from running more than once per job or step.
 -- Fix fields not properly printed when adding an account through sacctmgr.
 -- Update LBNL Node Health Check (NHC) link on FAQ.
 -- Fix multifactor plugin to prevent slurmctld from getting segmentation fault
    should the tres_alloc_cnt be NULL.
 -- sbatch/salloc - Move nodelist logic before the time min_nodes is used
    so we can set it correctly before tasks are set.

* Changes in Slurm 15.08.4
==========================
 -- Fix typo for the "devices" cgroup subsystem in pam_slurm_adopt.c
 -- Fix TRES_MAX flag to work correctly.
 -- Improve the systemd startup files.
 -- Added burst_buffer.conf flag parameter of "TeardownFailure" which will
    teardown and remove a burst buffer after failed stage-in or stage-out.
    By default, the buffer will be preserved for analysis and manual teardown.
 -- Prevent a core dump in srun if the signal handler runs during the job
    allocation causing the step context to be NULL.
 -- Don't fail job if multiple prolog operations in progress at slurmctld
    restart time.
 -- Burst_buffer/cray: Fix to purge terminated jobs with burst buffer errors.
 -- Burst_buffer/cray: Don't stall scheduling of other jobs while a stage-in
    is in progress.
 -- Make it possible to query 'extern' step with sstat.
 -- Make 'extern' step show up in the database.
 -- MYSQL - Quote assoc table name in mysql query.
 -- Make SLURM_ARRAY_TASK_MIN, SLURM_ARRAY_TASK_MAX, and SLURM_ARRAY_TASK_STEP
    environment variables available to PrologSlurmctld and EpilogSlurmctld.
 -- Fix slurmctld bug in which a pending job array could be canceled
    by a user different from the owner or the administrator.
 -- Support taking node out of FUTURE state with "scontrol reconfig" command.
 -- Sched/backfill: Fix to properly enforce SchedulerParameters of
    bf_max_job_array_resv.
 -- Enable operator to reset sdiag data.
 -- jobcomp/elasticsearch plugin: Add array_job_id and array_task_id fields.
 -- Remove duplicate #define IS_NODE_POWER_UP.
 -- Added SchedulerParameters option of max_script_size.
 -- Add REQUEST_ADD_EXTERN_PID option to add pid to the slurmstepd's extern
    step.
 -- Add unique identifiers to anchor tags in HTML generated from the man pages.
 -- Add with_freeipmi option to spec file.
 -- Minor elasticsearch code improvements

* Changes in Slurm 15.08.3
==========================
 -- Correct Slurm's RPM build if Munge is not installed.
 -- Job array termination status email ExitCode based upon highest exit code
    from any task in the job array rather than the last task. Also change the
    state from "Ended" or "Failed" to "Mixed" where appropriate.
 -- Squeue recombines pending job array records only if their name and partition
    are identical.
 -- Fix some minor leaks in the job info and step info API.
 -- Export missing QOS id when filling in association with the association
    manager.
 -- Fix invalid reference if a lua job_submit plugin references a default qos
    when a user doesn't exist in the database.
 -- Use association enforcement in the lua plugin.
 -- Fix a few spots missing defines of accounting_enforce or acct_db_conn
    in the plugins.
 -- Show requested TRES in scontrol show jobs when job is pending.
 -- Improve sched/backfill support for job features, especially XOR construct.
 -- Correct scheduling logic for job features option with XOR construct that
    could delay a job's initiation.
 -- Remove unneeded frees when creating a tres string.
 -- Send a tres_alloc_str for the batch step
 -- Fix incorrect check for slurmdb_find_tres_count_in_string in various places,
    it needed to check for INFINITE64 instead of zero.
 -- Don't allow scontrol to create partitions with the name "DEFAULT".
 -- burst_buffer/cray: Change error from "invalid request" to "permssion denied"
    if a non-authorized user tries to create/destroy a persistent buffer.
 -- PrologFlags work: Setting a flag of "Contain" implicitly sets the "Alloc"
    flag. Fix code path which could prevent execution of the Prolog when the
    "Alloc" or "Contain" flag were set.
 -- Fix for acct_gather_energy/cray|ibmaem to work with missed enum.
 -- MYSQL - When inserting a job and begin_time is 0 do not set it to
    submit_time.  0 means the job isn't eligible yet so we need to treat it so.
 -- MYSQL - Don't display ineligible jobs when querying for a window of time.
 -- Fix creation of advanced reservation of cores on nodes which are DOWN.
 -- Return permission denied if regular user tries to release job held by an
    administrator.
 -- MYSQL - Fix rollups for multiple jobs running by the same association
    in an hour counting multiple times.
 -- Burstbuffer/Cray plugin - Fix for persistent burst buffer use.
    Don't call paths if no #DW options.
 -- Modifications to pam_slurm_adopt to work correctly for the "extern" step.
 -- Alphabetize debugflags when printing them out.
 -- Fix systemd's slurmd service from killing slurmstepds on shutdown.
 -- Fixed counter of not indexed jobs, error_cnt post-increment changed to
    pre-increment.

* Changes in Slurm 15.08.2
==========================
 -- Fix for tracking node state when jobs that have been allocated exclusive
    access to nodes (i.e. entire nodes) and later relinquish some nodes. Nodes
    would previously appear partly allocated and prevent use by other jobs.
 -- Correct some cgroup paths ("step_batch" vs. "step_4294967294", "step_exter"
    vs. "step_extern", and "step_extern" vs. "step_4294967295").
 -- Fix advanced reservation core selection logic with network topology.
 -- MYSQL - Remove restriction to have to be at least an operator to query TRES
    values.
 -- For pending jobs have sacct print 0 for nnodes instead of the bogus 2.
 -- Fix for tracking node state when jobs that have been allocated exclusive
    access to nodes (i.e. entire nodes) and later relinquish some nodes. Nodes
    would previously appear partly allocated and prevent use by other jobs.
 -- Fix updating job in db after extending job's timelimit past partition's
    timelimit.
 -- Fix srun -I<timeout> from flooding the controller with step create requests.
 -- Requeue/hold batch job launch request if job already running (possible if
    node went to DOWN state, but jobs remained active).
 -- If a job's CPUs/task ratio is increased due to configured MaxMemPerCPU,
    then increase it's allocated CPU count in order to enforce CPU limits.
 -- Don't mark powered down node as not responding. This could be triggered by
    race condition of the node suspend and ping logic, preventing use of the
    node.
 -- Don't requeue RPC going out from slurmctld to DOWN nodes (can generate
    repeating communication errors).
 -- Propagate sbatch "--dist=plane=#" option to srun.
 -- Add acct_gather_energy/ibmaem plugin for systems with IBM Systems Director
    Active Energy Manager.
 -- Fix spec file to look for mariadb or mysql devel packages for build
    requirements.
 -- MySQL - Improve the code with asking for jobs in a suspended state.
 -- Fix slurcmtld allowing root to see job steps using squeues -s.
 -- Do not send burst buffer stage out email unless the job uses burst buffers.
 -- Fix sacct to not return all jobs if the -j option is given with a trailing
    ','.
 -- Permit job_submit plugin to set a job's priority.
 -- Fix occasional srun segfault.
 -- Fix issue with sacct, printing 0_0 for array's that had finished in the
    database but the start record hadn't made it yet.
 -- sacctmgr - Don't allow default account associations to be removed
    from a user.
 -- Fix sacct -j, (nothing but a comma) to not return all jobs.
 -- Fixed slurmctld not sending cold-start messages correctly to the database
    when a cold-start (-c) happens to the slurmctld.
 -- Fix case where if the backup slurmdbd has existing connections when it gives
    up control that the it would be killed.
 -- Fix task/cgroup affinity to work correctly with multi-socket
    single-threaded cores.  A regression caused only 1 socket to be used on
    this kind of node instead of all that were available.
 -- MYSQL - Fix minor issue after an index was added to the database it would
    previously take 2 restarts of the slurmdbd to make it stick correctly.
 -- Add hv_to_qos_cond() and qos_rec_to_hv() functions to the Perl interface.
 -- Add new burst_buffer.conf parameters: ValidateTimeout and OtherTimeout.
    See man page for details.
 -- Fix burst_buffer/cray support for interactive allocations >4GB.
 -- Correct backfill scheduling logic for job with INFINITE time limit.
 -- Fix issue on a scontrol reconfig all available GRES/TRES would be zeroed
    out.
 -- Set SLURM_HINT environment variable when --hint is used with sbatch or
    salloc.
 -- Add scancel -f/--full option to signal all steps including batch script and
    all of its child processes.
 -- Fix salloc -I to accept an argument.
 -- Avoid reporting more allocated CPUs than exist on a node. This can be
    triggered by resuming a previosly suspended job, resulting in
    oversubscription of CPUs.
 -- Fix the pty window manager in slurmstepd not to retry IO operation with
    srun if it read EOF from the connection with it.
 -- sbatch --ntasks option to take precedence over --ntasks-per-node plus node
    count, as documented. Set SLURM_NTASKS/SLURM_NPROCS environment variables
    accordingly.
 -- MYSQL - Make sure suspended time is only subtracted from the CPU TRES
    as it is the only TRES that can be given to another job while suspended.
 -- Clarify how TRESBillingWeights operates on memory and burst buffers.

* Changes in Slurm 15.08.1
==========================
 -- Fix test21.30 and 21.34 to check grpwall better.
 -- Add time to the partition QOS the job is running on instead of just the
    job QOS.
 -- Print usage for GrpJobs, GrpSubmitJobs and GrpWall even if there is no
    limit.
 -- If AccountingEnforce=safe is set make sure a job can finish before going
    over the limit with grpwall on a QOS or association.
 -- burst_buffer/cray - Major updates based upon recent Cray changes.
 -- Improve clean up logic of pmi2 plugin.
 -- Improve job state reason string when required nodes not available.
 -- Fix missing else when packing an update partition message
 -- Fix srun from inheriting the SLURM_CPU_BIND and SLURM_MEM_BIND environment
    variables when running in an existing srun (e.g. an srun within an salloc).
 -- Fix missing else when packing an update partition message.
 -- Use more flexible mechnanism to find json installation.
 -- Make sure safe_limits was initialized before processing limits in the
    slurmctld.
 -- Fix for burst_buffer/cray to parse type option correctly.
 -- Fix memory error and version number in the nonstop plugin and reservation
    code.
 -- When requesting GRES in a step check for correct variable for the count.
 -- Fix issue with GRES in steps so that if you have multiple exclusive steps
    and you use all the GRES up instead of reporting the configuration isn't
    available you hold the requesting step until the GRES is available.
 -- MYSQL - Change debug to print out with DebugFlags=DB_Step instead of debug4
 -- Simplify code when user is selecting a job/step/array id and removed
    anomaly when only asking for 1 (task_id was never set to INFINITE).
 -- MYSQL - If user is requesting various task_ids only return requested steps.
 -- Fix issue when tres cnt for energy is 0 for total reported.
 -- Resolved scalability issues of power adaptive scheduling with layouts.
 -- Burst_buffer/cray bug - Fix teardown race condition that can result in
    infinite loop.
 -- Add support for --mail-type=NONE option.
 -- Job "--reboot" option automatically, set's exclusive node mode.
 -- Fix memory leak when using PrologFlags=Alloc.
 -- Fix truncation of job reason in squeue.
 -- If a node is in DOWN or DRAIN state, leave it unavailable for allocation
    when powered down.
 -- Update the slurm.conf man page documenting better nohold_on_prolog_fail
    variable.
 -- Don't trucate task ID information in "squeue --array/-r" or "sview".
 -- Fix a bug which caused scontrol to core dump when releasing or
    holding a job by name.
 -- Fix unit conversion bug in slurmd which caused wrong memory calculation
    for cgroups.
 -- Fix issue with GRES in steps so that if you have multiple exclusive steps
    and you use all the GRES up instead of reporting the configuration isn't
    available you hold the requesting step until the GRES is available.
 -- Fix slurmdbd backup to use DbdAddr when contacting the primary.
 -- Fix error in MPI documentation.
 -- Fix to handle arrays with respect to number of jobs submitted.  Previously
    only 1 job was accounted (against MaxSubmitJob) for when an array was
    submitted.
 -- Correct counting for job array limits, job count limit underflow possible
    when master cancellation of master job record.
 -- Combine 2 _valid_uid_gid functions into a single function to avoid
    diversion.
 -- Pending job array records will be combined into single line by default,
    even if started and requeued or modified.
 -- Fix sacct --format=nnodes to print out correct information for pending
    jobs.
 -- Make is so 'scontrol update job 1234 qos='' will set the qos back to
    the default qos for the association.
 -- Add [Alloc|Req]Nodes to sacct to be more like cpus.
 -- Fix sacct documentation about [Alloc|Req]TRES
 -- Put node count in TRES string for steps.
 -- Fix issue with wrong protocol version when using the srun --no-allocate
    option.
 -- Fix TRES counts on GRES on a clean start of the slurmctld.
 -- Add ability to change a job array's maximum running task count:
    "scontrol update jobid=# arraytaskthrottle=#"

* Changes in Slurm 15.08.0
==========================
 -- Fix issue with frontend systems (outside ALPs or BlueGene) where srun
    wouldn't get the correct protocol version to launch a step.
 -- Fix for message aggregation return rpcs where none of the messages are
    intended for the head of the tree.
 -- Fix segfault in sreport when there was no response from the dbd.
 -- ALPS - Fix compile to not link against -ljob and -lexpat with every lib
    or binary.
 -- Fix testing for CR_Memory when CR_Memory and CR_ONE_TASK_PER_CORE are used
    with select/linear.
 -- When restarting or reconfiging the slurmctld, if job is completing handle
    accounting correctly to avoid meaningless errors about overflow.
 -- Add AccountingStorageTRES to scontrol show config
 -- MySQL - Fix minor memory leak if a connection ever goes away whist using it.
 -- ALPS - Make it so srun --hint=nomultithread works correctly.
 -- Make MaxTRESPerUser work in sacctmgr.
 -- Fix handling of requeued jobs with steps that are still finishing.
 -- Cleaner copy for PriorityWeightTRES, it also fixes a core dump when trying
    to free it otherwise.
 -- Add environment variables SLURM_ARRAY_TASK_MAX, SLURM_ARRAY_TASK_MIN,
    SLURM_ARRAY_TASK_STEP for job arrays.
 -- Fix srun to use the NoInAddrAny TopologyParam option.
 -- Change QOS flag name from PartitionQOS to OverPartQOS to be a better
    description.
 -- Fix rpmbuild issue on Centos7.

* Changes in Slurm 15.08.0rc1
==============================
 -- Added power_cpufreq layout.
 -- Make complete_batch_script RPC work with message aggregation.
 -- Do not count slurmctld threads waiting in a "throttle" lock against the
    daemon's thread limit as they are not contending for resources.
 -- Modify slurmctld outgoing RPC logic to support more parallel tasks (up to
    85 RPCs and 256 pthreads; the old logic supported up to 21 RPCs and 256
    threads). This change can dramatically improve performance for RPCs
    operating on small node counts.
 -- Increase total backfill scheduler run time in stats_info_response_msg data
    structure from 32 to 64 bits in order to prevent overflow.
 -- Add NoInAddrAny option to TopologyParam in the slurm.conf which allows to
    bind to the interface of return of gethostname instead of any address on
    the node which avoid RSIP issues in Cray systems.  This is most likely
    useful in other systems as well.
 -- Fix memory leak in Slurm::load_jobs perl api call.
 -- Added --noconvert option to sacct, sstat, squeue and sinfo which allows
    values to be displayed in their original unit types (e.g. 2048M won't be
    converted to 2G).
 -- Fix spelling of node_rescrs to node_resrcs in Perl API.
 -- Fix node state race condition, UNKNOWN->IDLE without configuration info.
 -- Cray: Disable LDAP references from slurmstepd on job launch due for
    improved scalability.
 -- Remove srun "read header error" due to application termination race
    condition.
 -- Optimize sacct queries with additional db indexes.
 -- Add SLURM_TOPO_LEN env variable for scontrol show topology.
 -- Add free_mem to node information.
 -- Fix abort of batch launch if prolog is running, wait for prolog instead.
 -- Fix case where job would get the wrong cpu count when using
    --ntasks-per-core and --cpus-per-task together.
 -- Add TRESBillingWeights to partitions in slurm.conf which allows taking into
    consideration any TRES Type when calculating the usage of a job.
 -- Add PriorityWeightTRES slurm.conf option to be able to configure priority
    factors for TRES types.

* Changes in Slurm 15.08.0pre6
==============================
 -- Add scontrol options to view and modify layouts tables.
 -- Add MsgAggregationParams which controls a reverse tree to the slurmctld
    which can be used to aggregate messages to the slurmctld into a single
    message to reduce communication to the slurmctld.  Currently only epilog
    complete messages and node registration messages use this logic.
 -- Add sacct and squeue options to print trackable resources.
 -- Add sacctmgr option to display trackable resources.
 -- If an salloc or srun command is executed on a "front-end" configuration,
    that job will be assigned a slurmd shepherd daemon on the same host as used
    to execute the command when possible rather than an slurmd daemon on an
    arbitrary front-end node.
 -- Add srun --accel-bind option to control how tasks are bound to GPUs and NIC
    Generic RESources (GRES).
 -- gres/nic plugin modified to set OMPI_MCA_btl_openib_if_include environment
    variable based upon allocated devices (usable with OpenMPI and Melanox).
 -- Make it so info options for srun/salloc/sbatch print with just 1 -v instead
    of 4.
 -- Add "no_backup_scheduling" SchedulerParameter to prevent jobs from being
    scheduled when the backup takes over. Jobs can be submitted, modified and
    cancelled while the backup is in control.
 -- Enable native Slurm backup controller to reside on an external Cray node
    when the "no_backup_scheduling" SchedulerParameter is used.
 -- Removed TICKET_BASED fairshare. Consider using the FAIR_TREE algorithm.
 -- Disable advanced reservation "REPLACE" option on IBM Bluegene systems.
 -- Add support for control distribution of tasks across cores (in addition
    to existing support for nodes and sockets, (e.g. "block", "cyclic" or
    "fcyclic" task distribution at 3 levels in the hardware rather than 2).
 -- Create db index on <cluster>_assoc_table.acct. Deleting accounts that didn't
    have jobs in the job table could take a long time.
 -- The performance of Profiling with HDF5 is improved. In addition, internal
    structures are changed to make it easier to add new profile types,
    particularly energy sensors. sh5util will continue to work with either
    format.
 -- Add partition information to sshare output if the --partition option
    is specified on the sshare command line.
 -- Add sreport -T/--tres option to identify Trackable RESources (TRES) to
    report.
 -- Display job in sacct when single step's cpus are different from the job
    allocation.
 -- Add association usage information to "scontrol show cache" command output.
 -- MPI/MVAPICH plugin now requires Munge for authentication.
 -- job_submit/lua: Add default_qos fields. Add job record qos.  Add partition
    record allow_qos and qos_char fields.

* Changes in Slurm 15.08.0pre5
==============================
 -- Add jobcomp/elasticsearch plugin. Libcurl is required for build. Configure
    the server as follows: "JobCompLoc=http://YOUR_ELASTICSEARCH_SERVER:9200".
 -- Scancel logic large re-written to better support job arrays.
 -- Added a slurm.conf parameter PrologEpilogTimeout to control how long
    prolog/epilog can run.
 -- Added TRES (Trackable resources) to track Mem, GRES, license, etc
    utilization.
 -- Add re-entrant versions of glibc time functions (e.g. localtime) to Slurm
    in order to eliminate rare deadlock of slurmstepd fork and exec calls.
 -- Constrain kernel memory (if available) in cgroups.
 -- Add PrologFlags option of "Contain" to create a proctrack container at
    job resource allocation time.
 -- Disable the OOM Killer in slurmd and slurmstepd's memory cgroup when using
    MemSpecLimit.

* Changes in Slurm 15.08.0pre4
==============================
 -- Burst_buffer/cray - Convert logic to use new commands/API names (e.g.
    "dws_setup" rather than "bbs_setup").
 -- Remove the MinJobAge size limitation. It can now exceed 65533 as it
    is represented using an unsigned integer.
 -- Verify that all plugin version numbers are identical to the component
    attempting to load them. Without this verification, the plugin can reference
    Slurm functions in the caller which differ (e.g. the underlying function's
    arguments could have changed between Slurm versions).
    NOTE: All plugins (except SPANK) must be built against the identical
    version of Slurm in order to be used by any Slurm command or daemon. This
    should eliminate some very difficult to diagnose problems due to use of old
    plugins.
 -- Increase the MAX_PACK_MEM_LEN define to avoid PMI2 failure when fencing
    with large amount of ranks (to 1GB).
 -- Requests by normal user to reset a job priority (even to lower it) will
    result in an error saying to change the job's nice value instead.
 -- SPANK naming changes: For environment variables set using the
    spank_job_control_setenv() function, the values were available in the
    slurm_spank_job_prolog() and slurm_spank_job_epilog() functions using
    getenv where the name was given a prefix of "SPANK_". That prefix has
    been removed for consistency with the environment variables available in
    the Prolog and Epilog scripts.
 -- Major additions to the layouts framework code.
 -- Add "TopologyParam" configuration parameter. Optional value of "dragonfly"
    is supported.
 -- Optimize resource allocation for systems with dragonfly networks.
 -- Add "--thread-spec" option to salloc, sbatch and srun commands. This is
    the count of threads reserved for system use per node.
 -- job_submit/lua: Enable reading and writing job environment variables.
    For example: if (job_desc.environment.LANGUAGE == "en_US") then ...
 -- Added two new APIs slurm_job_cpus_allocated_str_on_node_id()
    and slurm_job_cpus_allocated_str_on_node() to print the CPUs id
    allocated to a job.
 -- Specialized memory (a node's MemSpecLimit configuration parameter) is not
    available for allocation to jobs.
 -- Modify scontrol update job to allow jobid specification without
    the = sign. 'scontrol update job=123 ...' and 'scontrol update job 123 ...'
    are both valid syntax.
 -- Archive a month at a time when there are lots of records to archive.
 -- Introduce new sbatch option '--kill-on-invalid-dep=yes|no' which allows
    users to specify which behavior they want if a job dependency is not
    satisfied.
 -- Add Slurmdb::qos_get() interface to perl api.
 -- If a job fails to start set the requeue reason to be:
    job requeued in held state.
 -- Implemented a new MPI key,value PMIX_RING() exchange algorithm as
    an alternative to PMI2.
 -- Remove possible deadlocks in the slurmctld when the slurmdbd is busy
    archiving/purging.
 -- Add DB_ARCHIVE debug flag for filtering out debug messages in the slurmdbd
    when the slurmdbd is archiving/purging.
 -- Fix some power_save mode issues: Parsing of SuspendTime in slurm.conf was
    bad, powered down nodes would get set non-responding if there was an
    in-flight message, and permit nodes to be powered down from any state.
 -- Initialize variables in consumable resource plugin to prevent core dump.

* Changes in Slurm 15.08.0pre3
==============================
 -- CRAY - addition of acct_gather_energy/cray plugin.
 -- Add job credential to "Run Prolog" RPC used with a configuration of
    PrologFlags=alloc. This allows the Prolog to be passed identification of
    GPUs allocated to the job.
 -- Add SLURM_JOB_CONSTAINTS to environment variables available to the Prolog.
 -- Added "--mail=stage_out" option to job submission commands to notify user
    when burst buffer state out is complete.
 -- Require a "Reason" when using scontrol to set a node state to DOWN.
 -- Mail notifications on job BEGIN, END and FAIL now apply to a job array as a
    whole rather than generating individual email messages for each task in the
    job array.
 -- task/affinity - Fix memory binding to NUMA with cpusets.
 -- Display job's estimated NodeCount based off of partition's configured
    resources rather than the whole system's.
 -- Add AuthInfo option of "cred_expire=#" to specify the lifetime of a job
    step credential. The default value was changed from 1200 to 120 seconds.
 -- Set the delay time for job requeue to the job credential lifetime (120
    seconds by default). This insures that prolog runs on every node when a
    job is requeued. (This change will slow down launch of re-queued jobs).
 -- Add AuthInfo option of "cred_expire=#" to specify the lifetime of a job
    step credential.
 -- Remove srun --max-launch-time option. The option has not been functional
    since Slurm version 2.0.
 -- Add sockets and cores to TaskPluginParams' autobind option.
 -- Added LaunchParameters configuration parameter. Have srun command test
    locally for the executable file if LaunchParameters=test_exec or the
    environment variable SLURM_TEST_EXEC is set. Without this an invalid
    command will generate one error message per task launched.
 -- Fix the slurm /etc/init.d script to return 0 upon stopping the
    daemons and return 1 in case of failure.
 -- Add the ability for a compute node to be allocated to multiple jobs, but
    restricted to a single user. Added "--exclusive=user" option to salloc,
    sbatch and srun commands. Added "owner" field to node record, visible using
    the scontrol and sview commands. Added new partition configuration parameter
    "ExclusiveUser=yes|no".

* Changes in Slurm 15.08.0pre2
==============================
 -- Add the environment variables SLURM_JOB_ACCOUNT, SLURM_JOB_QOS
    and SLURM_JOB_RESERVATION in the batch/srun jobs.
 -- Add sview burst buffer display.
 -- Properly enforce partition Shared=YES option. Previously oversubscribing
    resources required gang scheduling to be configured.
 -- Enable per-partition gang scheduling resource resolution (e.g. the partition
    can have SelectTypeParameters=CR_CORE, while the global value is CR_SOCKET).
 -- Make it so a newer version of a slurmstepd can talk to an older srun.
    allocation. Nodes could have been added while waiting for an allocation.
 -- Expanded --cpu-freq parameters to include min-max:governor specifications.
    --cpu-freq now supported on salloc and sbatch.
 -- Add support for optimized job allocations with respect to SGI Hypercube
    topology.
    NOTE: Only supported with select/linear plugin.
    NOTE: The program contribs/sgi/netloc_to_topology can be used to build
    Slurm's topology.conf file.
 -- Remove 64k validation of incoming RPC nodelist size. Validated at 64MB
    when unpacking.
 -- In slurmstepd() add the user primary group if it is not part of the
    groups sent from the client.
 -- Added BurstBuffer field to advanced reservations.
 -- For advanced reservation, replace flag "License_only" with flag "Any_Nodes".
    It can be used to indicate the an advanced reservation resources (licenses
    and/or burst buffers) can be used with any compute nodes.
 -- Allow users to specify the srun --resv-ports as 0 in which case no ports
    will be reserved. The default behaviour is to allocate one port per task.
 -- Interpret a partition configuration of "Nodes=ALL" in slurm.conf as
    including all nodes defined in the cluster.
 -- Added new configuration parameters PowerParameters and PowerPlugin.
 -- Added power management plugin infrastructure.
 -- If job already exceeded one of its QOS/Accounting limits do not
    return error if user modifies QOS unrelated job settings.
 -- Added DebugFlags value of "Power".
 -- When caching user ids of AllowGroups use both getgrnam_r() and getgrent_r()
    then remove eventual duplicate entries.
 -- Remove rpm dependency between slurm-pam and slurm-devel.
 -- Remove support for the XCPU (cluster management) package.
 -- Add Slurmdb::jobs_get() interface to perl api.
 -- Performance improvement when sending data from srun to stepds when
    processing fencing.
 -- Add the feature to specify arbitrary field separator when running
    sacct -p or sacct -P. The command line option is --separator.
 -- Introduce slurm.conf parameter to use Proportional Set Size (PSS) instead
    of RSS to determinate the memory footprint of a job.
    Add an slurm.conf option not to kill jobs that is over memory limit.
 -- Add job submission command options: --sicp (available for inter-cluster
    dependencies) and --power (specify power management options) to salloc,
    sbatch, and srun commands.
 -- Add DebugFlags option of SICP (inter-cluster option logging).
 -- In order to support inter-cluster job dependencies, the MaxJobID
    configuration parameter default value has been reduced from 4,294,901,760
    to 2,147,418,112 and it's maximum value is now 2,147,463,647.
    ANY JOBS WITH A JOB ID ABOVE 2,147,463,647 WILL BE PURGED WHEN SLURM IS
    UPGRADED FROM AN OLDER VERSION!
 -- Add QOS name to the output of a partition in squeue/scontrol/sview/smap.

* Changes in Slurm 15.08.0pre1
==============================
 -- Add sbcast support for file transfer to resources allocated to a job step
    rather than a job allocation.
 -- Change structures with association in them to assoc to save space.
 -- Add support for job dependencies jointed with OR operator (e.g.
    "--depend=afterok:123?afternotok:124").
 -- Add "--bb" (burst buffer specification) option to salloc, sbatch, and srun.
 -- Added configuration parameters BurstBufferParameters and BurstBufferType.
 -- Added burst_buffer plugin infrastructure (needs many more functions).
 -- Make it so when the fanout logic comes across a node that is down we abandon
    the tree to avoid worst case scenarios when the entire branch is down and
    we have to try each serially.
 -- Add better error reporting of invalid partitions at submission time.
 -- Move will-run test for multiple clusters from the sbatch code into the API
    so that it can be used with DRMAA.
 -- If a non-exclusive allocation requests --hint=nomultithread on a
    CR_CORE/SOCKET system lay out tasks correctly.
 -- Avoid including unused CPUs in a job's allocation when cores or sockets are
    allocated.
 -- Added new job state of STOPPED indicating processes have been stopped with a
    SIGSTOP (using scancel or sview), but retain its allocated CPUs. Job state
    returns to RUNNING when SIGCONT is sent (also using scancel or sview).
 -- Added EioTimeout parameter to slurm.conf. It is the number of seconds srun
    waits for slurmstepd to close the TCP/IP connection used to relay data
    between the user application and srun when the user application terminates.
 -- Remove slurmctld/dynalloc plugin as the work was never completed, so it is
    not worth the effort of continued support at this time.
 -- Remove DynAllocPort configuration parameter.
 -- Add advance reservation flag of "replace" that causes allocated resources
    to be replaced with idle resources. This maintains a pool of available
    resources that maintains a constant size (to the extent possible).
 -- Added SchedulerParameters option of "bf_busy_nodes". When selecting
    resources for pending jobs to reserve for future execution (i.e. the job
    can not be started immediately), then preferentially select nodes that are
    in use. This will tend to leave currently idle resources available for
    backfilling longer running jobs, but may result in allocations having less
    than optimal network topology. This option is currently only supported by
    the select/cons_res plugin.
 -- Permit "SuspendTime=NONE" as slurm.conf value rather than only a numeric
    value to match "scontrol show config" output.
 -- Add the 'scontrol show cache' command which displays the associations
    in slurmctld.
 -- Test more frequently for node boot completion before starting a job.
    Provides better responsiveness.
 -- Fix PMI2 singleton initialization.
 -- Permit PreemptType=qos and PreemptMode=suspend,gang to be used together.
    A high-priority QOS job will now oversubscribe resources and gang schedule,
    but only if there are insufficient resources for the job to be started
    without preemption. NOTE: That with PreemptType=qos, the partition's
    Shared=FORCE:# configuration option will permit one job more per resource
    to be run than than specified, but only if started by preemption.
 -- Remove the CR_ALLOCATE_FULL_SOCKET configuration option.  It is now the
    default.
 -- Fix a race condition in PMI2 when fencing counters can be out of sync.
 -- Increase the MAX_PACK_MEM_LEN define to avoid PMI2 failure when fencing
    with large amount of ranks.
 -- Add QOS option to a partition.  This will allow a partition to have
    all the limits a QOS has.  If a limit is set in both QOS the partition
    QOS will override the job's QOS unless the job's QOS has the
    OverPartQOS flag set.
 -- The task_dist_states variable has been split into "flags" and "base"
    components. Added SLURM_DIST_PACK_NODES and SLURM_DIST_NO_PACK_NODES values
    to give user greater control over task distribution. The srun --dist options
    has been modified to accept a "Pack" and "NoPack" option. These options can
    be used to override the CR_PACK_NODE configuration option.

* Changes in Slurm 14.11.12
===========================
 -- Correct dependency formatting to print array task ids if set.
 -- Fix for configuration of "AuthType=munge" and "AuthInfo=socket=..." with
    alternate munge socket path.
 -- BGQ - Remove redeclaration of job_read_lock.
 -- BGQ - Tighter locks around structures when nodes/cables change state.
 -- Fix job array formatting to allow return [0-100:2] display for arrays with
    step functions rather than [0,2,4,6,8,...] .
 -- Associations - prevent hash table corruption if uid initially unset for
    a user, which can cause slurmctld to crash if that user is deleted.

* Changes in Slurm 14.11.11
===========================
 -- Fix systemd's slurmd service from killing slurmstepds on shutdown.
 -- Fix the qstat wrapper when user is removed from the system but still
    has running jobs.
 -- Log the request to terminate a job at info level if DebugFlags includes
    the Steps keyword.
 -- Fix potential memory corruption in _slurm_rpc_epilog_complete as well as
    _slurm_rpc_complete_job_allocation.
 -- Fix incorrectly sized buffer used by jobid2str which will cause buffer
    overflow in slurmctld. (Bug 2295.)

* Changes in Slurm 14.11.10
===========================
 -- Fix truncation of job reason in squeue.
 -- If a node is in DOWN or DRAIN state, leave it unavailable for allocation
    when powered down.
 -- Update the slurm.conf man page documenting better nohold_on_prolog_fail
    variable.
 -- Don't trucate task ID information in "squeue --array/-r" or "sview".
 -- Fix a bug which caused scontrol to core dump when releasing or
    holding a job by name.
 -- Fix unit conversion bug in slurmd which caused wrong memory calculation
    for cgroups.
 -- Fix issue with GRES in steps so that if you have multiple exclusive steps
    and you use all the GRES up instead of reporting the configuration isn't
    available you hold the requesting step until the GRES is available.
 -- Fix slurmdbd backup to use DbdAddr when contacting the primary.
 -- Fix error in MPI documentation.
 -- Fix to handle arrays with respect to number of jobs submitted.  Previously
    only 1 job was accounted (against MaxSubmitJob) for when an array was
    submitted.
 -- Correct counting for job array limits, job count limit underflow possible
    when master cancellation of master job record.
 -- For pending jobs have sacct print 0 for nnodes instead of the bogus 2.
 -- Fix for tracking node state when jobs that have been allocated exclusive
    access to nodes (i.e. entire nodes) and later relinquish some nodes. Nodes
    would previously appear partly allocated and prevent use by other jobs.
 -- Fix updating job in db after extending job's timelimit past partition's
    timelimit.
 -- Fix srun -I<timeout> from flooding the controller with step create requests.
 -- Requeue/hold batch job launch request if job already running (possible if
    node went to DOWN state, but jobs remained active).
 -- If a job's CPUs/task ratio is increased due to configured MaxMemPerCPU,
    then increase it's allocated CPU count in order to enforce CPU limits.
 -- Don't mark powered down node as not responding. This could be triggered by
    race condition of the node suspend and ping logic.
 -- Don't requeue RPC going out from slurmctld to DOWN nodes (can generate
    repeating communication errors).