NEWS

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

* Changes in SLURM 2.2.1
========================
 -- Fix setting derived exit code correctly for jobs that happen to have the
    same jobid.
 -- Better checking for time overflow when rolling up in accounting.
 -- Add scancel --reservation option to cancel all jobs associated with a
    specific reservation.
 -- Treat reservation with no nodes like one that starts later (let jobs of any
    size get queued and do not block any pending jobs).
 -- Fix bug in gang scheduling logic that would temporarily resume to many jobs
    after a job completed.
 -- Change srun message about job step being deferred due to SlurmctldProlog
    running to be more clear and only print when --verbose option is used.
 -- Made it so you could remove the hold on jobs with sview by setting the
    priority to infinite.
 -- BLUEGENE - better checking small blocks in dynamic mode whether a full
    midplane job could run or not.
 -- Decrease the maximum sleep time between srun job step creation retry
    attempts from 60 seconds to 29 seconds. This should eliminate a possible
    synchronization problem with gang scheduling that could result in job
    step creation requests only occuring when a job is suspended.
 -- Fix to prevent changing a held job's state from HELD to DEPENDENCY
    until the job is released. Patch from Rod Schultz, Bull.
 -- Fixed sprio -M to reflect PriorityWeight values from remote cluster.
 -- Fix bug in sview when trying to update arbitrary field on more than one
    job. Formerly would display information about one job, but update next
    selected job.
 -- Made it so QOS with UsageFactor set to 0 would make it so jobs running
    under that QOS wouldn't add time to fairshare or association/qos
    limits.
 -- Fixed issue where QOS priority wasn't re-normalized until a slurmctld
    restart when a QOS priority was changed.
 -- Fix sprio to use calculated numbers from slurmctld instead of
    calulating it own numbers.
 -- BLUEGENE - fixed race condition with preemption where if the wind blows the
    right way the slurmctld could lock up when preempting jobs to run others.
 -- BLUEGENE - fixed epilog to wait until MMCS job is totally complete before
    finishing.
 -- BLUEGENE - more robust checking for states when freeing blocks.
 -- Added correct files to the slurm.spec file for correct perl api rpm
    creation.

* Changes in SLURM 2.2.0
========================
 -- Change format of Duration field in "scontrol show reservation" output from
    an integer number of minutes to "[days-]hours:minutes:seconds".
 -- Add support for changing the reservation of pending or running jobs.
 -- On Cray systems only, salloc sends SIGKILL to spawned process group when
    job allocation is revoked. Patch from Gerrit Renker, CSCS.
 -- Fix for sacctmgr to work correctly when modifying user associations where
    all the associations contain a partition.
 -- Minor mods to salloc signal handling logic: forwards more signals and
    releases allocation on real-time signals. Patch from Gerrit Renker, CSCS.
 -- Add salloc logic to preserve tty attributes after abnormal exit. Patch
    from Mark Grondona, LLNL.
 -- BLUEGENE - Fix for issue in dynamic mode when trying to create a block
    overlapping a block with no job running on it but in configuring state.
 -- BLUEGENE - Speedup by skipping blocks that are deallocating for other jobs
    when starting overlapping jobs in dynamic mode.
 -- Fix for sacct --state to work correctly when not specifying a start time.
 -- Fix upgrade process in accounting from 2.1 for clusters named "cluster".
 -- Export more jobacct_common symbols needed for the slurm api on some systems.

* Changes in SLURM 2.2.0.rc4
============================
 -- Correction in logic to spread out over time highly parallel messages to
    minimize lost messages. Effects slurmd epilog complete messages and PMI
    key-pair transmissions. Patch from Gerrit Renker, CSCS.
 -- Fixed issue where if a system has unset messages to the dbd in 2.1 and
    upgrades to 2.2.  Messages are now processed correctly now.
 -- Fixed issue where assoc_mgr cache wasn't always loaded correctly if the
    slurmdbd wasn't running when the slurmctld was started.
 -- Make sure on a pthread create in step launch that the error code is looked
    at. Improves fault-tolerance of slurmd.
 -- Fix setting up default acct/wckey when upgrading from 2.1 to 2.2.
 -- Fix issue with associations attached to a specific partition with no other
    association, and requesting a different partition.
 -- Added perlapi to the slurmdb to the slurm.spec.
 -- In sched/backfill, correct handling of CompleteWait parameter to avoid
    backfill scheduling while a job is completing. Patch from Gerrit Renker,
    CSCS.
 -- Send message back to user when trying to launch job on computing lacking
    that user ID. Patch from Hongjia Cao, NUDT.
 -- BLUEGENE - Fix it so 1 midplane clusters will run small block jobs.
 -- Add Command and WorkDir to the output of "scontrol show job" for job
    allocations created using srun (not just sbatch).
 -- Fixed sacctmgr to not add blank defaultqos' when doing a cluster dump.
 -- Correct processing of memory and disk space specifications in the salloc,
    sbatch, and srun commands to work properly with a suffix of "MB", "GB",
    etc. and not only with a single letter (e.g. "M", "G", etc.).
 -- Prevent nodes with suspended jobs from being powered down by SLURM.
 -- Normalized the way pidfile are created by the slurm daemons.
 -- Fixed modifying the root association to no read in it's last value
    when clearing a limit being set.
 -- Revert some resent signal handling logic from salloc so that SIGHUP sent
    after the job allocation will properly release the allocation and cause
    salloc to exit.
 -- BLUEGENE - Fix for recreating a block in a ready state.
 -- Fix debug flags for incorrect logic when dealing with DEBUG_FLAG_WIKI.
 -- Report reservation's Nodes as a hostlist expression of all nodes rather
    than using "ALL".
 -- Fix reporting of nodes in BlueGene reservation (was reporting CPU count
    rather than cnode count in scontrol output for NodeCnt field).

* Changes in SLURM 2.2.0.rc3
============================
 -- Modify sacctmgr command to accept plural versions of options (e.g. "Users"
    in addition to "User"). Patch from Don Albert, BULL.
 -- BLUEGENE - make it so reset of boot counter happens only on state change
    and not when a new job comes along.
 -- Modify srun and salloc signal handling so they can be interrupted while
    waiting for an allocation. This was broken in version 2.2.0.rc2.
 -- Fix NULL pointer reference in sview. Patch from Gerrit Renker, CSCS.
 -- Fix file descriptor leak in slurmstepd on spank_task_post_fork() failure.
    Patch from Gerrit Renker, CSCS.
 -- Fix bug in preserving job state information when upgrading from SLURM
    version 2.1. Bug introduced in version 2.2.0-pre10. Patch from Par
    Andersson, NSC.
 -- Fix bug where if using the slurmdbd if a job wasn't able to start right
    away some accounting information may be lost.
 -- BLUEGENE - when a prolog failure happens the offending block is put in
    an error state.
 -- Changed the last column heading of the sshare output from "FS Usage" to
    "FairShare" and added more detail to the sshare man page.
 -- Fix bug in enforcement of reservation by account name. Used wrong index
    into an array. Patch from Gerrit Renker, CSCS.
 -- Modify job_submit/lua plugin to treat any non-zero return code from the
    job_submit and job_modify functions as an error and the user request should
    be aborted.
 -- Fix bug which would permit pending job to be started on completing node
    when job preemption is configured.

* Changes in SLURM 2.2.0.rc2
============================
 -- Fix memory leak in job step allocation logic. Patch from Hongjia Cao, NUDT.
 -- If a preempted job was submitted with the --no-requeue option then cancel
    rather than requeue it.
 -- Fix for problems when adding a user for the first time to a new cluster
    with a 2.1 sacctmgr without specifying a default account.
 -- Resend TERMINATE_JOB message only to nodes that the job still has not
    terminated on. Patch from Hongjia Cao, NUDT.
 -- Treat time limit specification of "0:300" as a request for 300 seconds
    (5 minutes) instead of one minute.
 -- Modify sched/backfill plugin logic to continue working its way down the
    queue of jobs rather than restarting at the top if there are no changes in
    job, node, or partition state between runs. Patch from Hongjia Cao, NUDT.
 -- Improve scalability of select/cons_res logic. Patch from Matthieu Hautreux,
    CEA.
 -- Fix for possible deadlock in the slurmstepd when cancelling a job that is
    also writing a large amount of data to stderr.
 -- Fix in select/cons_res to eliminate "mem underflow" error when the
    slurmctld is reconfigured while a job is in completing state.
 -- Send a message to the a user's job when it's real or virual memory limit
    is exceeded. :
 -- Apply rlimits right before execing the users task so to lower the risk of
    the task exiting because the slurmstepd ran over a limit (log file size,
    etc.)
 -- Add scontrol command of "uhold <job_id>" so that an administrator can hold
    a job and let the job's owner release it. The scontrol command of
    "hold <job_id>" when executed by a SLURM administrator can only be released
    by a SLURM administrator and not the job owner.
 -- Change atoi to slurm_atoul in mysql plugin, needed for running on 32-bit
    systems in some cases.
 -- If a batch job is found to be missing from a node, make its termination
    state be NODE_FAIL rather than CANCELLED.
 -- Fatal error put back if running a bluegene or cray plugin from a controller
    not of that type.
 -- Make sure jobacct_gather plugin is not shutdown before messing with the
    proccess list.
 -- Modify signal handling in srun and salloc commands to avoid deadlock if the
    malloc function is interupted and called again. The malloc function is
    thread safe, but not reentrant, which is a problem when signal handling if
    the malloc function itself has a lock. Problem fixed by moving signal
    handling in those commands to a new pthread.
 -- In srun set job abort flag on completion to handle the case when a user
    cancels a job while the node is not responding but slurmctld has not yet
    the node down. Patch from Hongjia Cao, NUDT.
 -- Streamline the PMI logic if no duplicate keys are included in the key-pairs
    managed. Substantially improves performance for large numbers of tasks.
    Adds support for SLURM_PMI_KVS_NO_DUP_KEYS environment variable. Patch
    from Hongjia Cao, NUDT.
 -- Fix issues with sview dealing with older versions of sview and saving
    defaults.
 -- Remove references to --mincores, --minsockets, and --minthreads from the
    salloc, sbatch and srun man pages. These options are defunct, Patch from
    Rod Schultz, Bull.
 -- Made openssl not be required to build RPMs, it is not required anymore
    since munge is the default crypto plugin.
 -- sacctmgr now has smarts to figure out if a qos is a default qos when
    modifing a user/acct or removing a qos.
 -- For reservations on BlueGene systems, set and report c-node counts rather
    than midplane counts.

* Changes in SLURM 2.2.0.rc1
============================
 -- Add show_flags parameter to the slurm_load_block_info() function.
 -- perlapi has been brought up to speed courtesy of Hongjia Coa. (make sure to