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 19.05.4
==========================
 -- Don't allow empty string as a reservation name; generate a name if empty
    string is provided.
 -- Fix salloc segfault when using --no-shell option.
 -- Fix divide by zero when normalizing partition priorities.
 -- Restore ability to set JobPriorityFactor to 0 on a partition.
 -- Fix multi-partition non-normalized job priorities.
 -- Adjust precedence between --mem-per-cpu and --mem-per-node to enforce
    them as mutually exclusive. Specifying either on the command line will
    now explicitly override any value inherited through the environment.
 -- Always print node's version, if it exists, in scontrol show nodes.
 -- sbatch - ensure SLURM_NTASKS_PER_NODE is exported when --ntasks-per-node
    is set.
 -- slurmctld - fix memory leak when using DebugFlags=Reservation.
 -- Reset --mem and --mem-per-cpu options correctly when using --mem-per-gpu.

* Changes in Slurm 19.05.3-2
============================
 -- Fix missing include for Cray Aries systems.

* Changes in Slurm 19.05.3
==========================
 -- Fix missing check from conversion of cray -> cray_aries.
 -- Improve job state reason string when required nodes are not available by
    not including those that don't belong to the job partition.
 -- Set a more appropriate ESLURM_RESERVATION_MAINT job state reason for jobs
    requesting feature(s) and required nodes are in a maintenance reservation.
 -- Fix logic to better handle maintenance reservations.
 -- Add spank options to cache in remote callback.
 -- Enforce the use of spank_option_getopt().
 -- Fix select plugins' will run test under-allocating nodes usage for
    completing jobs.
 -- Nodes in COMPLETING state treated as being currently available for job
    will-run test.
 -- Cray - fix contribs slurm.conf.j2 with updated cray_aries plugin names.
 -- job_submit/lua - fix problem where nil was expected for min_mem_per_cpu.
 -- Fix extra, unaccounted TRESRunMins usage created by heterogeneous jobs when
    running with the priority/multifactor plugin.
 -- Detach threads once they are done to avoid having to join them
    in track scripts code.
 -- Handle situation where a slurmctld tries to communicate with slurmdbd more
    than once at the same time.
 -- Fix XOR/XAND features like cpu&fastio&[knl|westmere] to be resolved
    correctly.
 -- Don't update [min|max]_exit_code on job array task requeue.
 -- Don't assume the first node of a job is the batch host when testing if the
    job's allocated nodes are booted/ready.
 -- Make --batch=<feature> requests wait for all nodes to be booted so that it
    can choose the batch host after the nodes have been booted -- possibly with
    different features.
 -- Fix talking to batch host on it's protocol version when using --batch.
 -- gres/mic plugin - add missing fini() function to clean up plugin state.
 -- Move _validate_node_choice() before prolog/epilog check.
 -- Look forward one week while create new reservation.
 -- Set mising resv_desc.flags before call _select_nodes().
 -- Use correct start_time for TIME_FLOAT reservation in _job_overlap().
 -- Properly enforce a job's mem-per-cpu option when allocate the node
    exclusively to that job.
 -- sched/backfill - clear estimated sched_nodes as done for start_time.
 -- Have safe_[read|write] handle EAGAIN and EINTR.
 -- Fix checking for flag with logical AND.
 -- Correct "extern" definition of variable if compiling with __APPLE__.
 -- Deprecate FastSchedule. FastSchedule will be removed in 20.02.
    The FastSchedule=2 functionality (used for testing and development) has
    been retained as the new SlurmdParameters=config_overrides option.
 -- Fix preemption issue when picking nodes for a feature job request.
 -- Fix race condition preventing held array job from getting a db_index.
 -- Fix select/cons_tres gres code infinite loop leaving slurmctld unresponsive.
 -- Remove redefinition of global variable in gres.c
 -- Fix issue where GPU devices are denied access when MPS is enabled.
 -- Fix uninitialized errors when compiling with CFLAGS="--coverage".
 -- Fix scancel --full for proctrack/cgroups.
 -- Fix sdiag backfill last and mean queue length stats.
 -- Do not remove batch host when resizing/shrinking a batch job.
 -- nss_slurm - fix file descriptor leaks.
 -- Fix preemption for jobs using complex feature requests
    (e.g. -C "[rack1*2&rack2*4]").
 -- Fix memory leaks in preemption when jobs request multiple features.
 -- Allow Operator users to show/fix runaways.
 -- Disallow coordinators to show/fix runaways.
 -- mpi/pmi2 - increase array len to avoid buffer size exceeded error.
 -- Preserve rebooting node's nextstate when updating state with scontrol.
 -- Fully merge slurm.conf and gres.conf before node_config_load().
 -- Remove FastSchedule dependence from gres.conf's AutoDetect=nvml.
 -- Forbid mix of typed and untyped GRES of same name in slurm.conf.
 -- cons_tres: Prevent creating a job without CPUs.
 -- Prevent underflow when filtering cores with gres.
 -- proctrack/cray_aries: use current pid instead of thread if we're in a fork.
 -- Fix missing check for prolog launch credential creation failure that can
    lead to segfaults.

* Changes in Slurm 19.05.2
==========================
 -- Wrap END_TIMER{,2,3} macro definition in "do {} while (0)" block.
 -- Allow account coordinators to add users who don't already have an
    association with any account.
 -- If only allowing particular alloc nodes in a partition, deny any request
    coming from an alloc node of NULL.
 -- Prevent partial-load of plugins which can leave certain interfaces in
    an inconsistent state.
 -- Remove stray __USE_GNU macro definitions from source.
 -- Fix loading fed state by backup on subsequent takeovers.
 -- Add missing job read lock when loading fed job state.
 -- Add missing fed_job_info jobs if fed state is lost.
 -- Do not build cgroup plugins on FreeBSD or NetBSD, and use proctrack/pgid
    by default instead.
 -- Do not build switch/cray_aries plugin on FreeBSD, NetBSD, or macOS.
 -- Fix build on FreeBSD.
 -- Fix race condition in route/topology plugin.
 -- In munge decode set the alloc_node field to the text representation of an
    IP address if the reverse lookup fails.
 -- Fix infinite loop in slurmstepd handling for nss_slurm REQUEST_GETGR RPC.
 -- Fix slurmstepd early assertion fail which prevented batch job launch or
    tasks launch on non-Linux systems.
 -- Fix regression with SLURM_STEP_GPUS env var being renamed SLURM_STEP_GRES.
 -- Fix pmix v3 linking if no rpath is allowed on build.
 -- Fix sacctmgr error handling when removing associations and users.
 -- Allow sacctmgr to add users to WCKeys without having TrackWCKey set in the
    slurm.conf.
 -- Allow sacctmgr to delete WCKeys from users.
 -- Change GRES type set by gpu/gpu_nvml plugin to be more specific - based
    on device name instead of brand name.
 -- cli_filter - fix logic error with option lookup functions.
 -- Fix bad testing of NodeFeatures debug flag in contribs/cray.
 -- Cleanup track_script code to avoid race conditions and invalid memory
    access.
 -- Fix jobs being killed after being requeued by preemption.
 -- Make register nodes verify correctly when using cons_tres.
 -- Fix srun --mem-per-cpu being ignored.
 -- Fix segfault in _update_job() under certain conditions.
 -- job_submit/lua - restore slurm.FAILURE as a synonym for slurm.ERROR.

* Changes in Slurm 19.05.1-2
============================
 -- Fix mistake in QOS time limit calculations for UsageFactor != 0 with any
    combination of flags set.

* Changes in Slurm 19.05.1
==========================
 -- accounting_storage/mysql - fix incorrect function names in error messages.
 -- accounting_storage/slurmdbd - trigger an fsync() on the dbd.messages state
    file to ensure it is committed to disk properly.
 -- Avoid JobHeldUser state reason from being updated at allocation time.
 -- Fix dump/load of rejected heterogeneous jobs.
 -- For heterogeneous jobs, do not count the each component against the QOS or
    association job limit multiple times.
 -- Comment out documentation for the incomplete and currently unusable
    burst_buffer/generic plugin.
 -- Add new error ESLURM_INVALID_TIME_MIN_LIMIT to make note when a time_min
    limit is invalid based on timelimit.
 -- Correct slurmdb cluster record pack with NULL pointer input.
 -- Clearer error message for ESLURM_INVALID_TIME_MIN_LIMIT.
 -- Fix SchedulerParameter bf_min_prio_reserve error when not the last parameter
 -- When fixing runaway jobs, change to reroll from earliest submit time, and
    never reroll from Unix epoch.
 -- Display submit time when running sacctmgr show runawayjobs and add format
    option to display eligible time.
 -- jobcomp/elasticsearch - fix minor race related to JobCompLoc setup.
 -- For HetJobs, ensure SLURM_PACK_JOB_ID is set regardless of whether
    PrologFlags=Alloc is enabled.
 -- Fix PriorityFlags regression with the mutation of FAIR_TREE to NO_FAIR_TREE.
 -- select/cons_res - fix debug flag SelectType handling in select_p_job_test.
 -- Fix sacctmgr archive dump commit confirmation.
 -- Prevent extra resources from being allocated when combining certain flags.
 -- Cray - fix template generator with update cray_aries plugin names.
 -- accounting_storage/slurmdbd - provide additional detail in several error
    messages.
 -- Backfill - If a job has a time_limit guess the end time of a job better
    if OverTimeLimit is Unlimited.
 -- Remove premature call to get system gpus before querying fake gpus that
    should override the real.
 -- Fix segfault in epilog_set_env() when gres_devices is NULL.
 -- Fix (un)supported states in sacct.
 -- Adjust build system to no longer use the AC_FUNC_MALLOC autoconf macro.
 -- srun - restore the --cpu_bind option to srun.
 -- Add UsageFactorSafe QOS flag to control applying UsageFactor at
    submission/scheduling time.
 -- Create missing reservations on DBD_MODIFY_RESV.
 -- Add error message when attempting to update association manager and object
    doesn't exist.
 -- Fix security issue in accounting_storage/mysql plugin on archive file loads
    by always escaping strings within the slurmdbd. CVE-2019-12838.

* Changes in Slurm 19.05.0
==========================
 -- Fix deprecated group by clause to use order by.
 -- NVML - Git rid of unneeded * when passing nvmlDevice_t to functions.
 -- NVML - Fix clang warning about unneeded variable initialization.
 -- NVML - remove unneeded {}.
 -- Add timers to new site_factor plugin APIs to warn of slow-running plugins,
    which can lead to issues with throughput and responsiveness.
 -- X11 forwarding - ignore screen value for local DISPLAY.
 -- Add missing locks protecting slurmctld_config.server_thread_count access.
 -- Fix jobs stuck from FedJobLock when requeueing in a federation
 -- Fix requeueing job in a federation of clusters with differing associations
 -- sacctmgr - free memory before exiting in 'sacctmgr show runaway'.
 -- Fix seff showing memory overflow when steps tres mem usage is 0.
 -- Fix memory leaks in 'sacctmgr show runawayjobs'.
 -- Fix potential deadlock in nss_slurm.
 -- Fix memory leaks due to incomplete slurmdb_cluster_cond_t destructor.
 -- Alter reservation flags column in slurmdbd to use uint64_t instead of
    uint16_t to ensure all current flags are saved correctly. Older releases
    unfortunately could not store details for newer flags (using bits 17-32)
    due to this field being silently truncated.
 -- Modify task layout with --overcommit option plus a heterogeneous job
    allocation so that a cyclic task distribution can start happening before
    all CPUs on all nodes are fully allocated. The number of tasks per node
    will be unchanged from the previous algorithm, but tasks will be distributed
    in a cyclic fashion first and then extra tasks placed on nodes with more
    CPUs. Previously all CPUs would be fully allocated in a cyclic fashion,
    then excess tasks distributed evenly across all allocated nodes.
 -- In select/cons_tres: Only allocate 1 CPU per node with the --overcommit
    option.
 -- In select/cons_res: Only allocate 1 CPU per node with the --overcommit and
    --nodelist options.
 -- Fix DefMemPer[CPU|Node] assignment on multi-partition job requests.
 -- Fix wrongly setting start_time to 0 for multi-part jobs.
 -- Upon archive file name collision, create new archive file instead of
    overwriting the old one to prevent lost records.
 -- Limit archive files to 50000 records per file so that archiving large
    databases will succeed.
 -- Remove stray newlines in SPANK plugin error messages.
 -- Fix archive loading events.
 -- In select/cons_res: Only allocate 1 CPU per node with the --overcommit and
    --nodelist options.
 -- Fix main scheduler from potentially not running through whole queue.
 -- Fix variable initiation to avoid slurmctld abort.
 -- In partition preemption, sort preemptor jobs only if they overlap a
    preemtable partition.
 -- cons_tres/dist_tasks - fix variable usage in cyclic distribution.
 -- cons_res/job_test - prevent a job from overallocating a node memory.
 -- cons_res/job_test - fix to consider a node's current allocated memory when
    testing a job's memory request.
 -- Fix issue where multi-node job steps on cloud nodes wouldn't finish cleaning
    up until the end of the job (rather than the end of the step).
 -- Fix packing pack_jobid in an sbcast.
 -- Fix GCC 9 compiler warnings.
 -- Add new job bit_flags of JOB_DEPENDENT.
 -- Make it so dependent jobs reset the AccrueTime and do not count against any
    AccrueTime limits.
 -- Fix sacctmgr --parsable2 output for reservations and tres.
 -- In multi-node systems make sure GRES are found on node when not bound to
    specific sockets.
 -- Fix gres-per-task logic for gres not bound to sockets.
 -- Fix issue when --gpus plus --cpus-per-gres was forcing socket binding
    unnecessarily.
 -- Change event table's state column to handle 32bits.
 -- Prevent slurmctld from potential segfault after job_start_data() called
    for completing job.
 -- Fix jobs getting on nodes with "scontrol reboot asap".
 -- Record node reboot events to database.
 -- Fix node reboot failure message getting to event table.
 -- Don't write "(null)" to event table when no event reason exists.
 -- Fix invalid memory read in cons_tres.
 -- Fix minor memory leak when clearing runaway jobs.
 -- Avoid flooding slurmctld and logging when prolog complete RPC errors occur.
 -- Fix slurmctld node_scheduler's feature_bitmap memory leak.
 -- Fatal when reading config if Alloc flag configured on FrontEnd mode.
 -- Modifications needed to run Federations with clusters running
    different select/switch plugins.
 -- Fix Clang errors for zero initializing struct with nested arrays.
 -- Fix minor memory leak in pmi2.
 -- MySQL - Fix minor memory leak when quering suspended jobs fails.
 -- Fix seff human readable memory string for values below a megabyte.
 -- Avoid slurmctld abort if GRES defined in gres.conf, but not in the node
    configuration of slurm.conf.
 -- Calculate task count for job with --gpus-per-task option, but no explicit
    task count.

* Changes in Slurm 19.05.0rc1
=============================
 -- Set CUDA_VISIBLE_DEVICES environment variable in Prolog and Epilog for jobs
    requesting gres/gpu.
 -- Remove '-U' argument - which was deprecated when '-A' was made the single
    character option before the Slurm 2.1 release - as an alternative to
    '--account' for salloc/sbatch/srun.
 -- Remove direct BLCR support and srun_cr.
 -- Make slurm_print_node_table only print a node's slurmd version if it is
    different to the one reported by slurm_load_ctl_conf.
 -- Call gres plugin environment setup even if gres not requested in job.
 -- Do not set CUDA_VISIBLE_DEVICES=NoDevFiles when no gres requested.
 -- If GRES configuration data is unavailable from gres.conf, then use the
    node's "Gres=" information slurm.conf. This will eliminate or minimize the
    gres.conf file in many situations.
 -- Fix checking IPMI XCC raw command response length.
 -- jobacct_gather/common - improve lightweight process identification.
 -- Cloud/PowerSave Improvements:
    - Better repsonsiveness to resuming and suspending.
    - Powering down nodes not eligible to be allocated until after
      SuspendTimeout.
    - Powering down nodes put in "Powering Down / %" state until after
      SuspendTimeout.
 -- Add idle_on_node_suspend SlurmctldParameter to make nodes idle regardless
    of state when suspended.
 -- Add PowerSave DebugFlag for Suspend/Resume debugging.
 -- Changed "scontrol reboot" to not default to ALL nodes.
 -- Changed "scontrol completing" to include two new fields - EndTime and
    CompletingTime.
 -- select/cons_tres - prevent job from overallocating a node memory.
 -- Refactor CLI option parsing for salloc/sbatch/srun into a central set of
    functions in src/common/slurm_opt.c. Note that this new option parsing can
    be stricter in a few specific situations - places that used to ignore
    invalid options and still submit/launch a job or job step may return an
    error() and refuse to proceed instead.
 -- Add preempt_send_user_signal SlurmctldParameter option to send user
    signal (e.g. --signal=<SIG_NUM>) at preemption if it hasn't already been
    sent.
 -- Add PreemptExemptTime parameter to slurm.conf and QOS to guarantee a
    minimum runtime before preemption.
 -- Set job's preempt time for non-grace time preemptions.
 -- Add sinfo format option to show used gres.
 -- Add reboot_from_controller SlurmctldParameter to allow RebootProgram to be
    run from the controller instead of the slurmds.
 -- Fix increasing of job size when extern steps exist.
 -- Reset GPU-related arguments to salloc/sbatch/srun for each separate
    heterogeneous job component.
 -- Do not set "(null)" for SLURM_JOB_CONSTRAINTS when no constraints are set
    in PrologSlurmctld/EpilogSlurmctld.
 -- Add SRUN_EXPORT_ENV as an input environment variable to srun.
 -- Return an error for invalid #SBATCH directives, and do not submit the job.
 -- Add S_JOB_ARRAY_ID and S_JOB_ARRAY_TASK_ID to spank_get_item().
 -- Change container_{g,p}_add_pid() to container_{g,p}_join() and remove the
    'pid_t pid' argument.
 -- Add new site_factor plugin type to permit sites to build plugins to set
    and modify the site priority factor value both initially on job submission,
    and periodically every PriorityCalcPeriod.
 -- Rename Cray plugins cray_aries in preperation for Cray/Shasta.
 -- Allow Het Jobs to work on a Cray.
 -- Add new cli_filter plugin type to permit sites to build plugins to log,
    modify, or reject CLI options within the salloc/sbatch/srun commands
    themselves.
 -- Allocate nodes that are booting. Previously, nodes that were being booted
    were off limits for allocation. This caused more nodes to be booted than
    needed in a cloud environment.
 -- pam_slurm_adopt - inject SLURM_JOB_ID environment variable into adopted
    processes.
 -- PMIx - use the Tree-based collective for empty fence operations.
 -- PMIx - replace use of the non-standard PMIX_VAL_SET macro with the
    standardized PMIX_VALUE_LOAD macro.
 -- slurm.spec - change --without cray option to set configure option of
    --enable-really-no-cray.
 -- slurm.spec - add new --with slurmsmwd option.
 -- pmi2: add mutex locking to all API calls to ensure thread-safety.
 -- Fix QOS usage factor to apply to TRES time limits and usage.
 -- Fix multi-cluster srun's with Select/Cray and other_cons_res.

* Changes in Slurm 19.05.0pre3
==============================
 -- Fix RPM packaging for accounting_storage/mysql.

* Changes in Slurm 19.05.0pre2
==============================
 -- Removed select/serial plugin.
 -- Remove 512-character line length limit in slurm_print_topo_record().
    (Used by "scontrol show topology".)
 -- Removed crypto/openssl plugin.
 -- Tweak the sdiag gettimeofday() line format for greater clarity.
 -- Add support for SALLOC/SBATCH/SLURM_NO_KILL environment variables.
    Add salloc/sbatch/srun support for optional "--no-kill=off" option to
    disable the environment variables.
 -- Fix salloc and missing SLURM_NTASKS.
 -- Alter the backfill scheduler behavior to prevent it from scheduling lower
    priority jobs on resources that become available during the backfill
    scheduling cycle when bf_continue is enabled. This behavior was available
    as the bf_ignore_newly_avail_nodes option in 18.08.4+, but is now enabled
    by default. (The SchedulerParameters option of bf_ignore_newly_avail_nodes
    is also now removed, although harmless if still set.)
 -- Make LaunchParameters=send_gids the default introducing the reverse option
    "disable_send_gids to go back to the original behavior.
 -- Limit pam_slurm_adopt to run only in the sshd context by default, for
    security reasons. A new module option 'service=<name>' can be used to
    allow a different PAM applications to work. The option 'service=*' can be
    used to restore the old behavior of always performing the adopt logic
    regardless of the PAM application context.
 -- pam_slurm_adopt: Use uid to determine whether root is logging.
 -- Remove sbatch --x11 option. Slurm's internal X11 forwarding is now only
    supported from salloc, or an allocating srun command.
 -- Suppressed printing of job id in sbatch when quiet flag is set.
 -- Changed sreport 'SizesByAccount' and 'SizesByAccountAndWckey' default
    behavior and added new 'AcctAsParent' option.
 -- Add ave watts to api and sview.
 -- Added printf attribute to setenvf() and corrected related warnings.
 -- Kill running/pending job is allocated GRES and that GRES has a "File"
    configuration, and the GRES count changes.
 -- Add new DebugFlag=Accrue for accrue accounting debugging purposes.
 -- Change CryptoType option to CredType, and rename crypto/munge plugin to
    cred/munge.
 -- Add slurmd -G option to print GRES configuration and exit. This is useful
    for testing and debugging.
 -- Support GRES types that include numbers (e.g. "--gres=gpu:123g:2").
 -- Remove MemLimitEnforce parameter and move functionality into
    JobAcctGatherParam=OverMemoryKill.
 -- sview - disable admin mode option (which would not work anyways) if the
    user is not an admin in SlurmDBD.
 -- Remove joules reporting from sview and scontrol.
 -- Change the default fair share algorithm to "fair tree". The new
    PriorityFlags option of NO_FAIR_TREE can be used to revert to "classic"
    fair share scheduling instead.
 -- libslurmdb has been merged into libslurm.
 -- Added -b as a short option for --begin and removed the -b option which
    was a left over artifact from the Moab compatibility work.
 -- Add ArrayTaskThrottle to "scontrol show job" output.
 -- Added SPRIO_FORMAT env variable to the sprio command.
 -- Add batch step at the beginning of a batch job so that squeue, sstat, and
    sacct will show the batch step.
 -- Deprecated 32-bit builds.
 -- Make -l and -o mutually exclusive in saccct, squeue, sinfo, and sprio
 -- Disable running job expansion by default. A new SchedulerParameter of
    permit_job_expansion has been added for sites that wish to re-enable it.
 -- Permit changing a job array's ArrayTaskThrottle value even if the job is
    terminated (for job requeue).
 -- Add scontrol requeue option of "Incomplete" which will requeue jobs only if
    they failed to complete with an exit code of zero.
 -- Modify GrpNodes limit to apply to unique nodes allocated (avoid double
    counting nodes allocated to multiple jobs in the same QOS or association).
 -- If a job submit does NOT include --cpus-per-task option, then report the
    value as "N/A" rather than always mapping the value to 1.
 -- X11 forwarding - use the raw value from gethostname() with xauth to avoid
    authentication issues when Slurm has internally stripped off the domain
    portion.
 -- Change how slurmd fills in the registration message version string from
    PACKAGE_VERSION to SLURM_VERSION_STRING, affecting how the version is
    displayed with sview, sinfo, scontrol and through the API.
 -- Remove autogen.sh script. Please use the autoreconf command instead.
 -- Disable a configuration of SelectTypeParameters=CR_ONE_TASK_PER_CORE with
    SelectType=select/cons_tres. This will be addressed later.
 -- job_submit/lua - expose more fields off the partition record.
 -- task/cgroup - prevent setting a memory.soft_limit_in_bytes higher than the
    memory.limit_in_bytes since the hard limit will take precedence anyway.
 -- If a GrpNodes limit is configurated in an association, partition QOS or
    job QOS then favor use of nodes already allocated to that entity. This
    will result in the configured node "Weight" being incremented by one for
    nodes which are not prefered. Consider adjusting configured node "Weight"
    values to achieve the desired node preferences.
 -- Add full node state debug2 output to slurmdbd node up/down update
 -- Set CUDA_VISIBLE_DEVICES and CUDA_MPS_ACTIVE_THREAD_PERCENTAGE environment
    variables in Prolog and Epilog for jobs requesting gres/mps.
 -- Added thresholds for backfill parameters.
 -- Fix for backfill sleep overflow when large values are set.
 -- Execute Epilog on nodes reliquished from job (i.e. job resized).
 -- Rename burst_buffer/cray plugin to burst_buffer/datawarp.
 -- X11 Forwarding - reimplement using new internal network forwarding RPCs.
 -- Remove slurm_jobcomp_get_errno and slurm_jobcomp_strerror from jobcomp
    plugin API.
 -- Optimize backfill for checking max jobs per assoc, partition, user, etc.

* Changes in Slurm 19.05.0pre1
==============================
 -- Run epilog and clean up allocation when a job is resized to zero and its
    resources transferred to another job (--depend=expand).
 -- If GRES are associated with specific sockets, identify those sockets in the
    output of "scontrol show node". For example if all 4 GPUs on a node are
    all associated with socket zero, then "Gres=gpu:4(S:0)". If associated
    with sockets 0 and 1 then "Gres=gpu:4(S:0-1)". The information of which
    specific GPUs are associated with specific GPUs is not reported, but only
    available by parsing the gres.conf file.
 -- Add configuration parameter "GpuFreqDef" to control a job's default GPU
    frequency.
 -- Add job flags to the database.  Currently used to determine which scheduler
    scheduled the job.
 -- Add constraints/features to the database.
 -- Add last reason job didn't run before resources/priority to the database.
 -- Make it so we set the alloc_node in a resource allocation based on the auth
    plugin instead of the rpc call.

* Changes in Slurm 18.08.9
==========================
 -- Wrap END_TIMER{,2,3} macro definition in "do {} while (0)" block.

* Changes in Slurm 18.08.8
==========================
 -- Update "xauth list" to use the same 10000ms timeout as the other xauth
    commands.
 -- Fix issue in gres code to handle a gres cnt of 0.
 -- Don't purge jobs if backfill is running.
 -- Verify job is pending add/removing accrual time.
 -- Don't abort when the job doesn't have an association that was removed
    before the job was able to make it to the database.
 -- Set state_reason if select_nodes() fails job for QOS or Account.
 -- Avoid seg_fault on referencing association without a valid_qos bitmap.
 -- If Association/QOS is removed on a pending job set that job as ineligible.
 -- When changing a jobs account/qos always make sure you remove the old limits.
 -- Don't reset a FAIL_QOS or FAIL_ACCOUNT job reason until the qos or
    account changed.
 -- Restore "sreport -T ALL" functionality.
 -- Correctly typecast signals being sent through the api.
 -- Properly initialize structures throughout Slurm.
 -- Sync "numtask" squeue format option for jobs and steps to "numtasks".
 -- Fix sacct -PD to avoid CA before start jobs.
 -- Fix potential deadlock with backup slurmctld.
 -- Fixed issue with jobs not appearing in sacct after dependency satisfied.
 -- Fix showing non-eligible jobs when asking with -j and not -s.
 -- Fix issue with backfill scheduler scheduling tasks of an array
    when not the head job.
 -- accounting_storage/mysql - fix SIGABRT in the archive load logic.
 -- accounting_storage/mysql - fix memory leak in the archive load logic.
 -- Limit records per single SQL statement when loading archived data.
 -- Fix unnecessary reloading of job submit plugins.
 -- Allow job submit plugins to be turned on/off with a reconfigure.
 -- Fix segfault when loading/unloading Lua job submit plugin multiple times.
 -- Fix printing duplicate error messages of jobs rejected by job submit plugin.
 -- Fix printing of job submit plugin messages of het jobs without pack id.
 -- Fix memory leak in group_cache.c
 -- Fix jobs stuck from FedJobLock when requeueing in a federation
 -- Fix requeueing job in a federation of clusters with differing associations
 -- sacctmgr - free memory before exiting in 'sacctmgr show runaway'.
 -- Fix seff showing memory overflow when steps tres mem usage is 0.
 -- Upon archive file name collision, create new archive file instead of
    overwriting the old one to prevent lost records.
 -- Limit archive files to 50000 records per file so that archiving large
    databases will succeed.
 -- Remove stray newlines in SPANK plugin error messages.
 -- Fix archive loading events.
 -- In select/cons_res: Only allocate 1 CPU per node with the --overcommit and
    --nodelist options.
 -- Fix main scheduler from potentially not running through whole queue.
 -- cons_res/job_test - prevent a job from overallocating a node memory.
 -- cons_res/job_test - fix to consider a node's current allocated memory when
    testing a job's memory request.
 -- Fix issue where multi-node job steps on cloud nodes wouldn't finish cleaning
    up until the end of the job (rather than the end of the step).
 -- Fix issue with a 17.11 sbcast call to a 18.08 daemon.
 -- Add new job bit_flags of JOB_DEPENDENT.
 -- Make it so dependent jobs reset the AccrueTime and do not count against any
    AccrueTime limits.
 -- Fix sacctmgr --parsable2 output for reservations and tres.
 -- Prevent slurmctld from potential segfault after job_start_data() called
    for completing job.
 -- Fix jobs getting on nodes with "scontrol reboot asap".
 -- Record node reboot events to database.
 -- Fix node reboot failure message getting to event table.
 -- Don't write "(null)" to event table when no event reason exists.
 -- Fix minor memory leak when clearing runaway jobs.
 -- Avoid flooding slurmctld and logging when prolog complete RPC errors occur.
 -- Fix GCC 9 compiler warnings.
 -- Fix seff human readable memory string for values below a megabyte.
 -- Fix dump/load of rejected heterogeneous jobs.
 -- For heterogeneous jobs, do not count the each component against the QOS or
    association job limit multiple times.
 -- slurmdbd - avoid reservation flag column corruption with the use of newer
    flags, instead preserve the older flag fields that we can still fit in the
    smallint field, and discard the rest.
 -- Fix security issue in accounting_storage/mysql plugin on archive file loads
    by always escaping strings within the slurmdbd. CVE-2019-12838.

* Changes in Slurm 18.08.7
==========================
 -- Set debug statement to debug2 to avoid benign error messages.
 -- Add SchedulerParameters option of bf_hetjob_immediate to attempt to start
    a heterogeneous job as soon as all of its components are determined able to
    do so.
 -- Fix underflow causing decay thread to exit.
 -- Fix main scheduler not considering hetjobs when building the job queue.
 -- Fix regression for sacct to display old jobs without a start time.
 -- Fix setting correct number of gres topology bits.
 -- Update hetjobs pending state reason when appropriate.
 -- Fix accounting_storage/filetxt's understanding of TRES.
 -- Set Accrue time when not enforcing limits.
 -- Fix srun segfault when requesting a hetjob with test_exec or bcast options.
 -- Hide multipart priorities log message behind Priority debug flag.
 -- sched/backfill - Make hetjobs sensitive to bf_max_job_start.
 -- Fix slurmctld segfault due to job's partition pointer NULL dereference.
 -- Fix issue with OR'ed job dependencies.
 -- Add new job's bit_flags of INVALID_DEPEND to prevent rebuilding a job's
    dependency string when it has at least one invalid and purged dependency.
 -- Promote federation unsynced siblings log message from debug to info.
 -- burst_buffer/cray - fix slurmctld SIGABRT due to illegal read/writes.
 -- burst_buffer/cray - fix memory leak due to unfreed job script content.
 -- node_features/knl_cray - fix script_argv use-after-free.
 -- burst_buffer/cray - fix script_argv use-after-free.
 -- Fix invalid reads of size 1 due to non null-terminated string reads.
 -- Add extra debug2 logs to identify why BadConstraints reason is set.

* Changes in Slurm 18.08.6-2
============================
 -- Remove deadlock situation when logging and --enable-debug is used.
 -- Fix RPM packaging for accounting_storage/mysql.

* Changes in Slurm 18.08.6
==========================
 -- Added parsing of -H flag with scancel.
 -- Fix slurmsmwd build on 32-bit systems.
 -- acct_gather_filesystem/lustre - add support for Lustre 2.12 client.
 -- Fix per-partition TRES factors/priority
 -- Fix per-partition NICE priority
 -- Fix partition access check validation for multi-partition job submissions.
 -- Prevent segfault on empty response in 'scontrol show dwstat'.
 -- node_features/knl_cray plugin - Preserve node's active features if it has
    already booted when slurmctld daemon is reconfigured.
 -- Detect missing burst buffer script and reject job.
 -- GRES: Properly reset the topo_gres_cnt_alloc counter on slurmctld restart
    to prevent underflow.
 -- Avoid errors from packing accounting_storage_mysql.so when RPM is built
    with out mysql support.
 -- Remove deprecated -t option from slurmctld --help.
 -- acct_gather_filesystem/lustre - fix stats gathering.
 -- Enforce documented default usage start and end times when querying jobs from
    the database.
 -- Fix issues when querying running jobs from the database.
 -- Deny sacct request where start time is later than the end time requested.
 -- Fix sacct verbose about time and states queried.
 -- burst_buffer/cray - allow 'scancel --hurry <jobid>' to tear down a burst
    buffer that is currently staging data out.
 -- X11 forwarding - allow setup if the DISPLAY environment variable lacks
    a screen number. (Permit both "localhost:10.0" and "localhost:10".)
 -- docs - change HTML title to include the page title or man page name.
 -- X11 forwarding - fix an unnecessary error message when using the
    local_xauthority X11Parameters option.
 -- Add use_raw_hostname to X11Parameters.
 -- Fix smail so it passes job arrays to seff correctly.
 -- Don't check InactiveLimit for salloc --no-shell jobs.
 -- Add SALLOC_GRES and SBATCH_GRES as input to salloc/sbatch.
 -- Remove drain state when node doesn't reboot by ResumeTimeout.
 -- Fix considering "resuming" nodes in scheduling.
 -- Do not kill suspended jobs due to exceeding time limit.
 -- Add NoAddrCache CommunicationParameter.
 -- Don't ping powering up cloud nodes.
 -- Add cloud_dns SlurmctldParameter.
 -- Consider --sbindir configure option as the default path to find slurmstepd.
 -- Fix node state printing of DRAINED$
 -- Fix spamming dbd of down/drained nodes in maintenance reservation.
 -- Avoid buffer overflow in time_str2secs.
 -- Calculate suspended time for suspended steps.
 -- Add null check for step_ptr->step_node_bitmap in _pick_step_nodes.
 -- Fix multi-cluster srun issue after 'scontrol reconfigure' was called.
 -- Fix accessing response_cluster_rec outside of write locks.
 -- Fix Lua user messages not showing up on rejected submissions.
 -- Fix printing multi-line error messages on rejected submissions.

* Changes in Slurm 18.08.5-2
============================
 -- Fix Perl build for 32-bit systems.

* Changes in Slurm 18.08.5
==========================
 -- Backfill - If a job has a time_limit guess the end time of a job better
    if OverTimeLimit is Unlimited.
 -- Fix "sacctmgr show events event=cluster"
 -- Fix sacctmgr show runawayjobs from sibling cluster
 -- Avoid bit offset of -1 in call to bit_nclear().
 -- Insure that "hbm" is a configured GresType on knl systems.
 -- Fix NodeFeaturesPlugins=node_features/knl_generic to allow other gres
    other than knl.
 -- cons_res: Prevent overflow on multiply.
 -- Better debug for bad values in gres.conf.
 -- Fix double accounting of energy at end of job.
 -- Read gres.conf for cloud nodes on slurmctld.
 -- Don't assume the first node of a job is the batch host when purging jobs
    from a node.
 -- Better debugging when a job doesn't have a job_resrcs ptr.
 -- Store ave watts in energy plugins.
 -- Add XCC plugin for reading Lenovo Power.
 -- Fix minor memory leak when scheduling rebootable nodes.
 -- Fix debug2 prefix for sched log.
 -- Fix printing correct SLURM_JOB_ACCOUNT_PACK_GROUP_* in env for a Het Job.
 -- sbatch - search current working directory first for job script.
 -- Make it so held jobs reset the AccrueTime and do not count against any
    AccrueTime limits.
 -- Add SchedulerParameters option of bf_hetjob_prio=[min|avg|max] to alter the
    job sorting algorithm for scheduling heterogeneous jobs.
 -- Fix initialization of assoc_mgr_locks and slurmctld_locks lock structures.
 -- Fix segfault with job arrays using X11 forwarding.
 -- Revert regression caused by e0ee1c7054 which caused negative values and
    values starting with a decimal to be invalid for PriorityWeightTRES and
    TRESBillingWeight.
 -- Fix possibility to update a job's reservation to none.
 -- Suppress connection errors to primary slurmdbd when backup dbd is active.
 -- Suppress connection errors to primary db when backup db kicks in
 -- Add missing fields for sacct --completion when using jobcomp/filetxt.
 -- Fix incorrect values set for UserCPU, SystemCPU, and TotalCPU sacct fields
    when JobAcctGatherType=jobacct_gather/cgroup.
 -- Fixed srun from double printing invalid option msg twice.
 -- Remove unused -b flag from getopt call in sbatch.
 -- Disable reporting of node TRES in sreport.
 -- Re-enabling features combined by OR within parenthesis for non-knl setups.
 -- Prevent sending duplicate requests to reboot a node before ResumeTimeout.
 -- Down nodes that don't reboot by ResumeTimeout.
 -- Update seff to reflect API change from rss_max to tres_usage_in_max.
 -- Add missing TRES constants from perl API.
 -- Fix issue where sacct would return incorrect array tasks when querying
    specific tasks.
 -- Add missing variables to slurmdb_stats_t in the perlapi.
 -- Fix nodes not getting reboot RPC when job requires reboot of nodes.
 -- Fix failing update the partition list of a job.
 -- Use slurm.conf gres ids instead of gres.conf names to get a gres type name.
 -- Add mitigation for a potential heap overflow on 32-bit systems in xmalloc.
    CVE-2019-6438.

* Changes in Slurm 18.08.4
==========================
 -- burst_buffer/cray - avoid launching a job that would be immediately
    cancelled due to a DataWarp failure.
 -- Fix message sent to user to display preempted instead of time limit when
    a job is preempted.
 -- Fix memory leak when a failure happens processing a nodes gres config.
 -- Improve error message when failures happen processing a nodes gres config.
 -- When building rpms ignore redundant standard rpaths and insecure relative
    rpaths, for RHEL based distros which use "check-rpaths" tool.
 -- Don't skip jobs in scontrol hold.
 -- Avoid locking the job_list when unneeded.
 -- Allow --cpu-bind=verbose to be used with SLURM_HINT environment variable.
 -- Make it so fixing runaway jobs will not alter the same job requeued
    when not runaway.
 -- Avoid checking state when searching for runaway jobs.
 -- Remove redundant check for end time of job when searching for runaway jobs.
 -- Make sure that we properly check for runawayjobs where another job might
    have the same id (for example, if a job was requeued) by also checking the
    submit time.
 -- Add scontrol update job ResetAccrueTime to clear a job's time
    previously accrued for priority.
 -- cons_res: Delay exiting cr_job_test until after cores/cpus are calculated
    and distributed.
 -- Fix bug where binary in cwd would trump binary in PATH with test_exec.
 -- Fix check to test printf("%s\n", NULL); to not require
    -Wno-format-truncation CFLAG.
 -- Fix JobAcctGatherParams=UsePss to report the correct usage.
 -- Fix minor memory leak in pmix plugin.
 -- Fix minor memory leak in slurmctld when reading configuration.
 -- Handle return codes correctly from pthread_* functions.
 -- Fix minor memory leak when a slurmd is unable to contact a slurmctld
    when trying to register.
 -- Fix sreport sizesbyaccount report when using Flatview and accounts.
 -- Fix incorrect shift when dealing with node weights and scheduling.
 -- libslurm/perl - Fix segfault caused by incorrect hv_to_slurm_ctl_conf.
 -- Add qos and assoc options to confirmation dialogs.
 -- Handle updating identical license or partition information correctly.
 -- Makes sure accounts and QOS' are all lower case to match documentation
    when read in from the slurm.conf file.
 -- Don't consider partitions without enough nodes in reservation,
    main scheduler.
 -- Set SLURM_NTASKS correctly if having to determine from other options.
 -- Removed GCP scripts from contribs. Now located at:
    https://github.com/SchedMD/slurm-gcp.
 -- Don't check existence of srun --prolog or --epilog executables when set to
    "none" and SLURM_TEST_EXEC is used.
 -- Add "P" suffix support to job and step tres specifications.
 -- When doing a reconfigure handle QOS' GrpJobsAccrue correctly.
 -- Remove unneeded extra parentheses from sh5util.
 -- Fix jobacct_gather/cgroup to work correctly when more than one task is
    started on a node.
 -- If requesting --ntasks-per-node with no tasks set tasks correctly.
 -- Accept modifiers for TRES originally added in 6f0342e0358.
 -- Don't remove reservation on slurmctld restart if nodes are removed from
    configuration.
 -- Fix bad xfree in task/cgroup.
 -- Fix removing counters if a job array isn't subject to limits and is
    canceled while pending.
 -- Make sure SLURM_NTASKS_PER_NODE is set correctly when env is overwritten
    by the command line.
 -- Clean up step on a failed node correctly.
 -- mpi/pmix: Fixed the logging of collective state.
 -- mpi/pmix: Make multi-slurmd work correctly when using ring communication.
 -- mpi/pmix: Fix double invocation of the PMIx lib fence callback.
 -- mpi/pmix: Remove unneeded libpmix callback drop in tree-based coll.
 -- Fix race condition in route/topology when the slurmctld is reconfigured.
 -- In route/topology validate the slurmctld doesn't try to initialize the
    node system.
 -- Fix issue when requesting invalid gres.
 -- Validate job_ptr in backfill before restoring preempt state.
 -- Fix issue when job's environment is minimal and only contains variables
    Slurm is going to replace internally.
 -- When handling runaway jobs remove all usage before rollup to remove any
    time that wasn't existent instead of just updating lines that have time
    with a lesser time.
 -- salloc - set SLURM_NTASKS_PER_CORE and SLURM_NTASKS_PER_SOCKET in the
    environment if the corresponding command line options are used.
 -- slurmd - fix handling of the -f flag to specify alternate config file
    locations.
 -- Fix scheduling logic to avoid using nodes that require a reboot for KNL
    node change when possible.
 -- Fix scheduling logic bug. There should have been a test for _not_
    NODE_SET_REBOOT to continue.
 -- Fix a scheuling logic bug with respect to XOR operation support when there
    are down nodes.
 -- If there is a constraint construct of the form "[...&...]"
    then an error is generated if more than one of those specifications
    contains KNL NUMA or MCDRAM modes.
 -- Fix stepd segfault race if slurmctld hasn't registered with the launching
    slurmd yet delivering it's TRES list.
 -- Add SchedulerParameters option of bf_ignore_newly_avail_nodes to avoid
    scheduling lower priority jobs on resources that become available during
    the backfill scheduling cycle when bf_continue is enabled.
 -- Decrement message_connections in stepd code on error path correctly.
 -- Decrease an error message to be debug.
 -- Fix missing suffixes in squeue.
 -- pam_slurm_adopt - send an error message to the user if no Slurm jobs
    can be located on the node.
 -- Run SlurmctldPrimaryOffProg when the primary slurmctld process shuts down.
 -- job_submit/lua: Add several slurmctld return codes.
 -- job_submit/lua: Add user/group info to jobs.
 -- Fix formatting issues when printing uint64_t.
 -- Bump RLIMIT_NOFILE for daemons in systemd services.
 -- Expand %x in job name in 'scontrol show job'.
 -- salloc/sbatch/srun - print warning if mutually exclusive options of --mem
    and --mem-per-cpu are both set.

* Changes in Slurm 18.08.3
==========================
 -- Fix regression in 18.08.1 that caused dbd messages to not be queued up
    when the dbd was down.
 -- Fix regression in 18.08.1 that can cause a slurmctld crash when splitting
    job array elements.

* Changes in Slurm 18.08.2
==========================
 -- Correctly initialize variable in env_array_user_default().
 -- Remove race condition when signaling starting step.
 -- Fix issue where 17.11 job's using GRES in didn't initialize new 18.08
    structures after unpack.
 -- Stop removing nodes once the minimum CPU or node count for the job is
    reached in the cons_res plugin.
 -- Process any changes to MinJobAge and SlurmdTimeout in the slurmctld when
    it is reconfigured to determine changes in its background timers.
 -- Use previous SlurmdTimeout in the slurmctld after a reconfigure to
    determine the time a node has been down.
 -- Fix multi-cluster srun between clusters with different SelectType plugins.
 -- Fix removing job licenses on reconfig/restart when configured license
    counts are 0.
 -- If a job requested multiple licenses and one license was removed then on
    a reconfigure/restart all of the licenses -- including the valid ones
    would be removed.
 -- Fix issue where job's license string wasn't updated after a restart when
    licenses were removed or added.
 -- Add allow_zero_lic to SchedulerParameters.
 -- Avoid scheduling tasks in excess of ArrayTaskThrottle when canceling tasks
    of an array.
 -- Fix jobs that request memory per node and task count that can't be
    scheduled right away.
 -- Avoid infinite loop with jobacct_gather/linux when pids wrap around
    /proc/sys/kernel/pid_max.
 -- Fix --parsable2 output for sacct and sstat commands to remove a stray
    trailing delimiter.
 -- When modifying a user's name in sacctmgr enforce PreserveCaseUser.
 -- When adding a coordinator or user that was once deleted enforce
    PreserveCaseUser.
 -- Correctly handle scenarios where a partitions MaxMemPerCPU is less than
    a jobs --mem-per-cpu and also -c is greater than 1.
 -- Set AccrueTime correctly when MaxJobsAccrue is disabled and BeginTime has
    not been established.
 -- Correctly account for job arrays for new {Max/Grp}JobsAccrue limits.

* Changes in Slurm 18.08.1
==========================
 -- Remove commented-out parts of man pages related to cons_tres work in 19.05,
    as these were showing up on the web version due to a syntax error.
 -- Prevent slurmctld performance issues in main background loop if multiple
    backup controllers are unavailable.
 -- Add missing user read association lock in burst_buffer/cray during init().
 -- Fix incorrect spacing for PartitionName lines in 'scontrol write config'.
 -- Fix creation of step hwloc xml file for after cpuset cgroup has been
    created.
 -- Add userspace as a valid default governor.
 -- Add timers to group_cache_lookup so if going slow advise
    LaunchParameters=send_gids.
 -- Fix SLURM_STEP_GRES=none to work correctly.
 -- Fix potential memory leak when a failure happens unpacking a ctld_multi_msg.
 -- Fix potential double free when a faulure happens when unpacking a
    node_registration_status_msg.
 -- Fix sacctmgr show runaways.
 -- Removed non-POSIX append operator from configure script for non-bash
    support.
 -- Fix incorrect spacing for PartitionName lines in 'scontrol write config'.
 -- Fix sacct to not print huge reserve times when the job was never eligible.
 -- burst_buffer/cray - Add missing locks around assoc_mgr when timing out a
    burst buffer.
 -- burst_buffer/cray - Update burst buffers when an association or qos
    is removed from the system.
 -- Remove documentation for deprecated Cray/ALPS systems. Please switch to
    Native Cray mode instead.
 -- Completely copy features when copying the list in the slurmctld.
 -- PMIX - Fix issue with packing processes when using an arbitrary task
    distribution.
 -- Fix hostlists to be able to handle nodenames with '-' in them surrounded
    by integers.
 -- Added sort option to sprio output.
 -- Fix correct job CPU count allocated.
 -- Fix sacctmgr setting GrpJobs limit when setting GrpJobsAccrue limit.
 -- Change the defaults to MemLimitEnforce=no and NoOverMemoryKill
    (See RELEASE_NOTES).
 -- Prevent abort when using Cray node features plugin on non-knl.
 -- Add ability to reboot down nodes with scontrol reboot_nodes.
 -- Protect against sending to the slurmdbd if the connection has gone away.
 -- Fix invalid read when not using backup slurmctlds.
 -- Prevent acct coordinators from changing default acct on add user.
 -- Don't allow scontrol top do modify job priorities when priority == 1.
 -- slurmsmwd - change parsing code to handle systems with the svid or inst
    fields set in xtconsumer output.
 -- Fix infinite loop in slurmctld if GRES is specified without a count.
 -- sacct: Print error when unknown arguments are found.
 -- Fix checking missing return codes when unpacking structures.
 -- Fix slurm.spec-legacy including slurmsmwd
 -- More explicit error message when cgroup oom-kill events detected.
 -- When updating an association and are unable to find parent association
    initialize old fairshare association pointer correctly.
 -- Wrap slurm_cond_signal() calls with mutexes where needed.
 -- Fix correct timeout with resends in slurm_send_only_node_msg.
 -- Fix pam_slurm_adopt to honor action_adopt_failure.
 -- Have the slurmd recreate the hwloc xml file for the full system on restart.
 -- sdiag - correct the units for the gettimeofday() stat to microseconds.
 -- Set SLURM_CLUSTER_NAME environment variable in MailProg to the ClusterName.
 -- smail - use SLURM_CLUSTER_NAME environment variable.
 -- job_submit/lua - expose argc/argv options through lua interface.
 -- slurmdbd - prevent false-positive warning about innodb settings having
    been set too low if they're actually set over 2GB.

* Changes in Slurm 18.08.0
==========================
 -- Fix segfault on job arrays when starting controller without dbd up.
 -- Fix pmi2 to build with gcc 8.0+.
 -- Remove the development snapshot of select/cons_tres plugin.
 -- Fix slurmd -C to not print benign error from xcpuinfo.
 -- Fix potential double locks in the assoc_mgr.
 -- Fix sacct truncate flag behavior Truncated pending jobs will always
    return a start and end time set to the window end time, so elapsed
    time is 0.
 -- Fix extern step hanging forever when canceled right after creation.
 -- sdiag - add slurmctld agent count.
 -- Remove requirement to have cgroup_allowed_devices_file.conf in order to
    constrain devices. By default all devices are allowed and GRES, that are
    associated with a device file, that are not requested are restricted.
 -- Fix proper alignment of clauses when determining if more nodes are needed
    for an allocation.
 -- Fix race condition when canceling a federation job that just started
    running.
 -- Prevent extra resources from being allocated when combining certain flags.
 -- Fix problem in task/affinity plugin that can lead to slurmd fatal()'ing
    when using --hint=nomultithread.
 -- Fix left over socket file when step is ending and using pmi2 with
    %n or %h in the spool dir.
 -- Don't remove hwloc full system xml file when shutting down the slurmd.
 -- Fix segfault that could happen with a het job when it was canceled while
    starting.
 -- Fix scan-build false-positive warning about invalid memory access in the
    _ping_controller() function.
 -- Add control_inx value to trigger_info_msg_t to permit future work in the
    trigger management code to distinguish which of multiple backup controllers
    has changed state.

* Changes in Slurm 18.08.0rc1
==============================
 -- Add TimelimitRaw sacct output field to display timelimit numbers.
 -- Fix job array preemption during backfill scheduling.
 -- Fix scontrol -o show assoc output.
 -- Add support for sacct --whole-hetjob=[yes|no] option.
 -- Make salloc handle node requests the same as sbatch.
 -- Add shutdown_on_reboot SlurmdParameter to control whether the Slurmd will
    shutdown itself down or not when a reboot request is received.
 -- Add cancel_reboot scontrol option to cancel pending reboot of nodes.
 -- Make Users case insensitive in the database based on
    Parameters=PreserveCaseUser in the slurmdbd.conf.
 -- Improve scheduling when dealing with node_features that could have a
    boot delay.
 -- Fix issue if a step launch fails we don't get a bunch of '(null)' strings
    in the step record for usage.
 -- Changed the default AuthType for slurmdbd to auth/munge.
 -- Make it so libpmi.so doesn't link to libslurm.so.$apiversion.
 -- Added 'remote-fs.target' to After directive of slurmd.service file.
 -- Fix filetxt plugin to handle it when you aren't running a jobacct_gather
    plugin.
 -- Remove drain on node when reboot nextstate used.
 -- Speed up pack of job's qos.
 -- Fix race condition when trying to update reservation in the database.
 -- For the PrologFlags slurm.conf option, make NoHold mutually exclusive with
    Contain and/or X11 options.
 -- Revise the handling of SlurmctldSyslogLevel and SlurmdSyslogLevel options
    in slurm.conf and DebugLevelSyslog in slurmdbd.conf.
 -- Gate reading the cgroup.conf file.
 -- Gate reading the acct_gather_* plugins.
 -- Add sacctmgr options to prevent/manage job queue stuffing:
    - GrpJobsAccrue=<max_jobs>
      Maximum number of pending jobs in aggregate able to accrue age priority
      for this association and all associations which are children of this
      association. To clear a previously set value use the modify command with
      a new value of -1.
    - MaxJobsAccrue=<max_jobs>
      Maximum number of pending jobs able to accrue age priority at any given
      time for the given association. This is overridden if set directly on a
      user. Default is the cluster's limit. To clear a previously set value use
      the modify command with a new value of -1.
    - MinPrioThreshold
      Minimum priority required to reserve resources when scheduling.

* Changes in Slurm 18.08.0pre2
==============================
 -- Remove support for "ChosLoc" configuration parameter.
 -- Configuration parameters "ControlMachine", "ControlAddr", "BackupController"
    and "BackupAddr" replaced by an ordered list of "SlurmctldHost" records
    with the optional address appended to the name enclosed in parenthesis.
    For example: "SlurmctldHost=head(12.34.56.78)". An arbitrary number of
    backup servers can be configured.
 -- When a pending job's state includes "UnavailableNodes" do not include the
    nodes in FUTURE state.
 -- Remove --immediate option from sbatch.
 -- Add infrastructure for per-job and per-step TRES parameters: tres-per-job,
    tres-per-node, tres-per-socket, tres-per-task, cpus-per-tres, mem-per-tres,
    tres-bind and tres-freq. These new parameters are not currently used, but