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 2.2.0.pre9
=============================
 -- sbatch can now submit jobs to multiple clusters and run on the earliest
    available.
 -- Fix bug introduced in pre8 that prevented job dependencies and job
    triggers from working without the --enable-debug configure option.
 -- Replaced slurm_addr with slurm_addr_t
 -- Replaced slurm_fd with slurm_fd_t
 -- Skeleton code added for BlueGeneQ.
 -- Jobs can now be submitted to multiple partitions (job queues) and use the
    one permitting earliest start time.
 -- Change slurmdb_coord_table back to acct_coord_table to keep consistant
    with < 2.1.
 -- Introduced locking system similar to that in the slurmctld for the
    assoc_mgr.
 -- Added ability to change a users name in accounting.
 -- Restore squeue support for "%G" format (group id) accidentally removed in
    2.2.0.pre7.
 -- Added preempt_mode option to QOS.
 -- Added a grouping=individual for sreport size reports.
 -- Added remove_qos logic to jobs running under a QOS that was removed.
 -- scancel now exits with a 1 if any job is non-existant when canceling.
 -- Better handling of select plugins that don't exist on various systems for
    cross cluster communication.  Slurmctld, slurmd, and slurmstepd now only
    load the default select plugin as well.
 -- Better error handling when loading plugins.
 -- Prevent scontrol from aborting if getlogin() returns NULL.
 -- Prevent scontrol segfault when there are hidden nodes.
 -- Prevent srun segfault after task launch failure.
 -- Added job_submit/lua plugin.
 -- Fixed sinfo on a bluegene system to print correctly the output for:
    sinfo -e -o "%9P %6m %.4c %.22F %f"
 -- Add scontrol commands "hold" and "release" to simplify setting a job's
    priority to 0 or 1. Also tests that the job is in pending state.
 -- Increase maximum node list size (for incoming RPC) from 1024 bytes to 64k.
 -- In the backup slurmctld, purge triggers before recovering trigger state to
    avoid duplicate entries.
 -- Fix bug in sacct processing of --fields= option.
 -- Fix bug in checkpoint/blcr for jobs spanning multiple nodes introduced when
    changing some variable names in version 2.2.0.pre5.
 -- Removed the vestigal set_max_cluster_usage() function from the Priority
    Plugin API.
 -- Modify the output of "scontrol show job" for the field ReqS:C:T=. Fields
    not specified by the user will be reported as "*" instead of 65534.
 -- Added DefaultQOS option for an association.
 -- BLUEGENE - Added -B option to the slurmctld to clear created blocks from
    the system on start.
 -- BLUEGENE - Added option to scontrol & sview to recreate existing blocks.

* Changes in SLURM 2.2.0.pre8
=============================
 -- Add DebugFlags parameter of "Backfill" for sched/backfill detailed logging.
 -- Add DebugFlags parameter of "Gang" for detailed logging of gang scheduling
    activities.
 -- Add DebugFlags parameter of "Priority" for detailed logging of priority
    multifactor activities.
 -- Add DebugFlags parameter of "Reservation" for detailed logging of advanced
    reservations.
 -- Add run time to mail message upon job termination and queue time for mail
    message upon job begin.
 -- Add email notification option for job requeue.
 -- Generate a fatal error if the srun --relative option is used when not
    within an existing job allocation.
 -- Modify the meaning of InactiveLimit slightly. It will now cancel the job
    allocation created using the salloc or srun command if those commands
    cease responding for the InactiveLimit regardless of any running job steps.
    This parameter will no longer effect jobs spawned using sbatch.
 -- Remove AccountingStoragePass and JobCompPass from configuration RPC and
    scontrol show config command output. The use of SlurmDBD is still strongly
    recommended as SLURM will have limited database functionality or protection
    otherwise.
 -- Add sbatch options of --export and SBATCH_EXPORT to control which
    environment variables (if any) get propagated to the spawned job. This is
    particularly important for jobs that are submitted on one cluster and run
    on a different cluster.
 -- Fix bug in select/linear when used with gang scheduling and there are
    preempted jobs at the time slurmctld restarts that can result in over-
    subscribing resources.
 -- Added keeping track of the qos a job is running with in accounting.
 -- Fix for handling correctly jobs that resize, and also reporting correct
    stats on a job after it finishes.
 -- Modify gang scheduler so with SelectTypeParameter=CR_CPUS and task
    affinity is enabled, keep track of the individual CPUs allocated to jobs
    rather than just the count of CPUs allocated (which could overcommit
    specific CPUs for running jobs).
 -- Modify select/linear plugin data structures to eliminate underflow errors
    for the exclusive_cnt and tot_job_cnt variables (previously happened when
    slurmctld reconfigured while the job was in completing state).
 -- Change slurmd's working directory (and location of core files) to match
    that of the slurmctld daemon: the same directory used for log files,
    SlurmdLogFile (if specified with an absolute pathname) otherwise the
    directory used to save state, SlurmdSpoolDir.
 -- Add sattach support for the --pty option.
 -- Modify slurmctld communications logic to accept incoming messages on more
    than one port for improved scalability.
 -- Add SchedulerParameters option of "defer" to avoid trying to schedule a
    job at submission time, but to attempt scheduling many jobs at once for
    improved performance under heavy load.
 -- Correct logic controlling slurmctld thread limit eliminating check of
    RLIMIT_STACK.
 -- Make slurmctld's trigger logic more robust in the event that job records
    get purged before their trigger can be processed (e.g. MinJobAge=1).
 -- Add support for users to hold/release their own jobs (submit the job with
    srun/sbatch --hold/-H option or use "scontrol update jobid=# priority=0"
    to hold and "scontrol update jobid=# priority=1" to release).
 -- Added ability for sacct to query jobs by qos and a range of timelimits.
 -- Added ability for sstat to query pids of steps running.
 -- Support time specification in UTS format with a prefix of "uts" (e.g.
    "sbatch --begin=uts458389988 my.script").

* Changes in SLURM 2.2.0.pre7
=============================
 -- Fixed issue with sacctmgr if querying against non-existent cluster it
    works the same way as 2.1.
 -- Added infrastructure to support allocation of generic node resources (gres).
    -Modified select/linear and select/cons_res plugins to allocate resources
     at the level of a job without oversubcription.
    -Get sched/backfill operating with gres allocations.
    -Get gres configuration changes (reconfiguration) working.
    -Have job steps allocate resources.
    -Modified job step credential to include the job's and step's gres
     allocation details.
    -Integrate with HWLOC library to identify GPUs and NICs configured on each
     node.
 -- SLURM commands (squeue, sinfo, etc...) can now go cross-cluster on like
    linux systems.  Cross-cluster for bluegene to linux and such should
    work fine, even sview.
 -- Added the ability to configure PreemptMode on a per-partition basis.
 -- Change slurmctld's default thread limit count to 1024, but adjust that down
    as needed based upon the process's resource limits.
 -- Removed the non-functional "SystemCPU" and "TotalCPU" reporting fields from
    sstat and updated man page
 -- Correct location of apbasil command on Cray XT systems.
 -- Fixed bug in MinCPU and AveCPU calculations in sstat command
 -- Send message to srun when the Prolog takes too long (MessageTimeout) to
    complete.
 -- Change timeout for socket connect() to be half of configured MessageTimeout.
 -- Added high-throughput computing web page with configuration guidance.
 -- Use more srun sockets to process incoming PMI (MPICH2) connections for
    better scalability.
 -- Added DebugFlags for the select/bluegene plugin: DEBUG_FLAG_BG_PICK,
    DEBUG_FLAG_BG_WIRES, DEBUG_FLAG_BG_ALGO, and DEBUG_FLAG_BG_ALGO_DEEP.
 -- Remove vestigial job record field "kill_on_step_done" (internal to the
    slurmctld daemon only).
 -- For MPICH2 jobs: Clear PMI state between job steps.

* Changes in SLURM 2.2.0.pre6
=============================
 -- sview - added ability to see database configuration.
 -- sview - added ability to add/remove visible tabs.
 -- sview - change way grid highlighting takes place on selected objects.
 -- Added infrastructure to support allocation of generic node resources.
    -Added node configuration parameter of Gres=.
    -Added ability to view/modify a node's gres using scontrol, sinfo and sview.
    -Added salloc, sbatch and srun --gres option.
    -Added ability to view a job or job step's gres using scontrol, squeue and
     sview.
    -Added new configuration parameter GresPlugins to define plugins used to
     manage generic resources.
    -Added framework for gres plugins.
    -Added DebugFlags option of "gres" for detailed debugging of gres actions.
 -- Slurmd modified to log slow slurmstepd startup and note possible file system
    problem.
 -- sview - There is now a .slurm/sviewrc created when running sview.
    Defaults are put in there as to how sview looks when first launched.
    You can set these by Ctrl-S or Options->Set Default Settings.
 -- Add scontrol "wait_job <job_id>" option to wait for nodes to boot as needed.
    Useful for batch jobs (in Prolog, PrologSlurmctld or the script) if powering
    down idle nodes.
 -- Added salloc and sbatch option --wait-for-nodes. If set non-zero, job 
    initiation will be delayed until all allocated nodes have booted. Salloc
    will log the delay with the messages "Waiting for nodes to boot" and "Nodes
    are ready for use". 
 -- The Priority/mulitfactor plugin now takes into consideration size of job
    in cpus as well as size in nodes when looking at the job size factor.
    Previously only nodes were considered.
 -- When using the SlurmDBD messages waiting to be sent will be combined
    and sent in one message.
 -- Remove srun's --core option. Move the logic to an optional SPANK plugin
    (currently in the contribs directory, but plan to distribute through
    http://code.google.com/p/slurm-spank-plugins/).
 -- Patch for adding CR_CORE_DEFAULT_DIST_BLOCK as a select option to layout
    jobs using block layout across cores within each node instead of cyclic
    which was previously the default.
 -- Accounting - When removing associations if jobs are running, those jobs
    must be killed before proceeding.  Before the jobs were killed
    automatically thus causing user confusion on what is most likely an
    admin's mistake.
 -- sview - color column keeps reference color when highlighting.
 -- Configuration parameter MaxJobCount changed from 16-bit to 32-bit field.
    The default MaxJobCount was changed from 5,000 to 10,000.
 -- SLURM commands (squeue, sinfo, etc...) can now go cross-cluster on like
    linux systems.  Cross-cluster for bluegene to linux and such does not
    currently work.  You can submit jobs with sbatch.  Salloc and srun are not
    cross-cluster compatible, and given their nature to talk to actual compute
    nodes these will likely never be.
 -- salloc modified to forward SIGTERM to the spawned program.
 -- In sched/wiki2 (for Moab support) - Add GRES and WCKEY fields to MODIFYJOBS
    and GETJOBS commands. Add GRES field to GETNODES command.
 -- In struct job_descriptor and struct job_info: rename min_sockets to
    sockets_per_node, min_cores to cores_per_socket, and min_threads to
    threads_per_core (the values are not minimum, but represent the target
    values).
 -- Fixed bug in clearing a partition's DisableRootJobs value reported by
    Hongjia Cao.
 -- Purge (or ignore) terminated jobs in a more timely fashion based upon the
    MinJobAge configuration parameter. Small values for MinJobAge should improve
    responsiveness for high job throughput.

* Changes in SLURM 2.2.0.pre5
=============================
 -- Modify commands to accept time format with one or two digit hour value
    (e.g. 8:00 or 08:00 or 8:00:00 or 08:00:00).
 -- Modify time parsing logic to accept "minute", "hour", "day", and "week" in
    addition to the currently accepted "minutes", "hours", etc.
 -- Add slurmd option of "-C" to print actual hardware configuration and exit.
 -- Pass EnforcePartLimits configuration parameter from slurmctld for user
    commands to see the correct value instead of always "NO".
 -- Modify partition data structures to replace the default_part,
    disable_root_jobs, hidden and root_only fields with a single field called
    "flags" populated with the flags PART_FLAG_DEFAULT, PART_FLAG_NO_ROOT
    PART_FLAG_HIDDEN and/or PART_FLAG_ROOT_ONLY. This is a more flexible
    solution besides making for smaller data structures.
 -- Add node state flag of JOB_RESIZING. This will only exist when a job's
    accounting record is being written immediately before or after it changes
    size. This permits job accounting records to be written for a job at each
    size.
 -- Make calls to jobcomp and accounting_storage plugins before and after a job
    changes size (with the job state being JOB_RESIZING). All plugins write a
    record for the job at each size with intermediate job states being
    JOB_RESIZING.
 -- When changing a job size using scontrol, generate a script that can be
    executed by the user to reset SLURM environment variables.
 -- Modify select/linear and select/cons_res to use resources released by job
    resizing.
 -- Added to contribs foundation for Perl extension for slurmdb library.
 -- Add new configuration parameter JobSubmitPlugins which provides a mechanism
    to set default job parameters or perform other site-configurable actions at
    job submit time.
 -- Better postgres support for accounting, still beta.
 -- Speed up job start when using the slurmdbd.
 -- Forward step failure reason back to slurmd before in some cases it would
    just be SLURM_FAILURE returned.
 -- Changed squeue to fail when passed invalid -o <output_format> or
    -S <sort_list> specifications.

* Changes in SLURM 2.2.0.pre4
=============================
 -- Add support for a PropagatePrioProcess configuration parameter value of 2
    to restrict spawned task nice values to that of the slurmd daemon plus 1.
    This insures that the slurmd daemon always have a higher scheduling
    priority than spawned tasks.
 -- Add support in slurmctld, slurmd and slurmdbd for option of "-n <value>" to
    reset the daemon's nice value.
 -- Fixed slurm_load_slurmd_status and slurm_pid2jobid to work correctly when
    multiple slurmds are in use.
 -- Altered srun to set max_nodes to min_nodes if not set when doing an
    allocation to mimic that which salloc and sbatch do.  If running a step if
    the max isn't set it remains unset.
 -- Applied patch from David Egolf (David.Egolf@Bull.com). Added the ability
    to purge/archive accounting data on a day or hour basis, previously
    it was only available on a monthly basis.
 -- Add support for maximum node count in job step request.
 -- Fix bug in CPU count logic for job step allocation (used count of CPUS per
    node rather than CPUs allocated to the job).
 -- Add new configuration parameters GroupUpdateForce and GroupUpdateTime.
    See "man slurm.conf" for details about how these control when slurmctld
    updates its information of which users are in the groups allowed to use
    partitions.
 -- Added sacctmgr list events which will list events that have happened on
    clusters in accounting.
 -- Permit a running job to shrink in size using a command of
    "scontrol update JobId=# NumNodes=#" or
    "scontrol update JobId=# NodeList=<names>". Subsequent job steps must
    explicitly specify an appropriate node count to work properly.
 -- Added resize_time field to job record noting the time of the latest job
    size change (to be used for accounting purposes).
 -- sview/smap now hides hidden partitions and their jobs by default, with an
    option to display them.

* Changes in SLURM 2.2.0.pre3
=============================
 -- Refine support for TotalView partial attach. Add parameter to configure
    program of "--enable-partial-attach".
 -- In select/cons_res, the count of CPUs on required nodes was formerly
    ignored in enforcing the maximum CPU limit. Also enforce maximum CPU
    limit when the topology/tree plugin is configured (previously ignored).
 -- In select/cons_res, allocate cores for a job using a best-fit approach.
 -- In select/cons_res, for jobs that can run on a single node, use a best-fit
    packing approach.
 -- Add support for new partition states of DRAIN and INACTIVE and new partition
    option of "Alternate" (alternate partition to use for jobs submitted to 
    partitions that are currently in a state of DRAIN or INACTIVE).
 -- Add group membership cache. This can substantially speed up slurmctld
    startup or reconfiguration if many partitions have AllowGroups configured.
 -- Added slurmdb api for accessing slurm DB information.
 -- In select/linear: Modify data structures for better performance and to 
    avoid underflow error messages when slurmctld restarts while jobs are
    in completing state.
 -- Added hash for slurm.conf so when nodes check in to the controller it can
    verify the slurm.conf is the same as the one it is running.  If not an
    error message is displayed.  To silence this message add NO_CONF_HASH
    to DebugFlags in your slurm.conf.
 -- Added error code ESLURM_CIRCULAR_DEPENDENCY and prevent circular job
    dependencies (e.g. job 12 dependent upon job 11 AND job 11 is dependent
    upon job 12).
 -- Add BootTime and SlurmdStartTime to available node information.
 -- Fixed moab_2_slurmdb to work correctly under new database schema.
 -- Slurmd will drain a compute node when the SlurmdSpoolDir is full.

* Changes in SLURM 2.2.0.pre2
=============================
 -- Add support for spank_get_item() to get S_STEP_ALLOC_CORES and 
    S_STEP_ALLOC_MEM. Support will remain for S_JOB_ALLOC_CORES and 
    S_JOB_ALLOC_MEM. 
 -- Kill individual job steps that exceed their memory limit rather than 
    killing an entire job if one step exceeds its memory limit.
 -- Added configuration parameter VSizeFactor to enforce virtual memory limits 
    for jobs and job steps as a percentage of their real memory allocation.
 -- Add scontrol ability to update job step's time limits.
 -- Add scontrol ability to update job's NumCPUs count.
 -- Add --time-min options to salloc, sbatch and srun. The scontrol command 
    has been modified to display and modify the new field. sched/backfill
    plugin has been changed to alter time limits of jobs with the 
    --time-min option if doing so permits earlier job initiation.
 -- Add support for TotalView symbol MPIR_partial_attach_ok with srun support
    to release processes which TotalView does not attach to.
 -- Add new option for SelectTypeParameters of CR_ONE_TASK_PER_CORE. This 
    option will allocate one task per core by default. Without this option, 
    by default one task will be allocated per thread on nodes with more than 
    one ThreadsPerCore configured.
 -- Avoid accounting separately for a current pid corresponds to a Light Weight
    Process (Thread POSIX) appearing in the /proc directory. Only account for
    the original process (pid==tgid) to avoid accounting for memory use more 
    than once.
 -- Add proctrack/cgroup plugin which uses Linux control groups (aka cgroup)
    to track processes on Linux systems having this feature enabled (kernel
    >= 2.6.24).
 -- Add logging of license transations including job_id.
 -- Add configuration parameters SlurmSchedLogFile and SlurmSchedLogLevel to
    support writing scheduling events to a separate log file.
 -- Added contribs/web_apps/chart_stats.cgi, a web app that invokes sreport to
    retrieve from the accounting storage db a user's request for job usage or
    machine utilization statistics and charts the results to a browser.
 -- Massive change to the schema in the storage_accounting/mysql plugin.  When
    starting the slurmdbd the process of conversion may take a few minutes.
    You might also see some errors such as 'error: mysql_query failed: 1206
    The total number of locks exceeds the lock table size'.  If you get this,
    do not worry, it is because your setting of innodb_buffer_pool_size in
    your my.cnf file is not set or set too low.  A decent value there should
    be 64M or higher depending on the system you are running on.  See
    RELEASE_NOTES for more information.  But setting this and then
    restarting the mysqld and slurmdbd will put things right.  After this
    change we have noticed 50-75% increase in performance with sreport and
    sacct.
 -- Fix for MaxCPUs to honor partitions of 1 node that have more than the
    maxcpus for a job.
 -- Add support for "scontrol notify <message>" to work for batch jobs.

* Changes in SLURM 2.2.0.pre1
=============================
 -- Added RunTime field to scontrol show job report
 -- Added SLURM_VERSION_NUMBER and removed SLURM_API_VERSION from 
    slurm/slurm.h.
 -- Added support to handle communication with SLURM 2.1 clusters.  Job's
    should not be lost in the future when upgrading to higher versions of 
    SLURM.
 -- Added withdeleted options for listing clusters, users, and accounts
 -- Remove PLPA task affinity functions due to that package being deprecated.
 -- Preserve current partition state information and node Feature and Weight 
    information rather than use contents of slurm.conf file after slurmctld 
    restart with -R option or SIGHUP. Replace information with contents of 
    slurm.conf after slurmctld restart without -R or "scontrol reconfigure".
    See RELEASE_NOTES file fore more details.
 -- Modify SLURM's PMI library (for MPICH2) to properly execute an executable
    program stand-alone (single MPI task launched without srun).
 -- Made GrpCPUs and MaxCPUs limits work for select/cons_res.
 -- Moved all SQL dependant plugins into a seperate rpm slurm-sql.  This
    should be needed only where a connection to a database is needed (i.e.
    where the slurmdbd is running)
 -- Add command line option "no_sys_info" to PAM module to supress system 
    logging of "access granted for user ...", access denied and other errors
    will still be logged.
 -- sinfo -R now has the user and timestamp in separate fields from the reason.
 -- Much functionality has been added to account_storage/pgsql.  The plugin
    is still in a very beta state.  It is still highly advised to use the
    mysql plugin, but if you feel like living on the edge or just really
    like postgres over mysql for some reason here you go. (Work done
    primarily by Hongjia Cao, NUDT.)

* Changes in SLURM 2.1.11
=========================
 -- BLUEGENE - fix sinfo to not get duplicate entries when running command
    sinfo -e -o "%9P %6m %.4c %.22F %f"
 -- Fix bug that caused segv when deleting a partition with pending jobs.
 -- Better error message for when trying to modify an account's name with
    sacctmgr.
 -- Added back removal of #include "src/common/slurm_xlator.h" from
    select/cons_res.
 -- Fix incorrect logic in global_accounting in regression tests for
    setting QOS.
 -- BLUEGENE - Fixed issue where removing a small block in dynamic mode,
    and other blocks also in that midplane needed to be removed and were in
    and error state.  They all weren't removed correctly in accounting.
 -- Prevent scontrol segv with "scontrol show node <name>" command with nodes
    in a hidden partition.
 -- Fixed sizing of popup grids in sview.
 -- Fixed sacct when querying against a jobid the start time is not set.
 -- Fix configure to get correct version of pkg-config if both 32bit and 64bit
    libs are installed.

* Changes in SLURM 2.1.10
=========================
 -- Fix memory leak in sched/builtin plugin.
 -- Fixed sbatch to work correctly when no nodes are specified, but
    --ntasks-per-node is.
 -- Make sure account and wckey for a job are lower case before inserting into
    accounting.
 -- Added note to squeue documentation about --jobs option displaying jobs
    even if they are on hidden partitions.
 -- Fix srun to work correctly with --uid when getting an allocation
    and creating a step.
 -- Fix for when removing a limit from a users association inside the
    fairshare tree the parents limit is now inherited automatically in
    the slurmctld.  Previously the slurmctld would have to be restarted.
    This problem only exists when setting a users association limit to -1.
 -- Patch from Matthieu Hautreux (CEA) dealing with possible overflows that
    could come up with the select/cons_res plugin with uint32_t's being treated
    as uint16_t's.
 -- Correct logic for creating a reservation with a Duration=Infinite (used to
    set reservation end time in the past).
 -- Correct logic for creating a reservation that properly handles the OVERLAP
    and IGNORE_JOBS flags (flags were ignored under some conditions).
 -- Fixed a fair-share calculation bug in the priority/multifactor plugin.
 -- Make sure a user entry in the database that was previously deleted is
    restored clean when added back, i.e. remove admin privileges previously
    given.
 -- BLUEGENE - Future start time is set correctly when eligible time for a job
    is in the future, but the job can physically run earlier.
 -- Updated Documentation for sacctmgr for Wall and CPUMin options stating when
    the limit is reached running jobs will be killed.
 -- Fix deadlock issue in the slurmctld when lowering limits in accounting to
    lower than that of pending jobs.
 -- Fix bug in salloc, sbatch and srun that could under some conditions process
    the --threads-per-core, --cores-per-socket and --sockets-per-node options
    improperly.
 -- Fix bug in select/cons_res with memory management plus job preemption with
    job removal (e.g. requeue) which under some conditions failed to preempt
    jobs.
 -- Fix deadlock potential when using qos and associations in the slurmctld.
 -- Update documentation to state --ntasks-per-* is for a maximum value
    instead of an absolute.
 -- Get ReturnToService=2 working for front-end configurations (e.g. Cray or
    BlueGene).
 -- Do not make a non-responding node available for use after running
    "scontrol update nodename=<name> state=resume". Wait for node to respond
    before use.
 -- Added slurm_xlator.h to jobacct_gather plugins so they resolve symbols
    correctly when linking to the slurm api.
 -- You can now update a jobs QOS from scontrol.  Previously you could only do
    this from sview.
 -- BLUEGENE - Fixed bug where if running in non-dynamic mode sometimes the
    start time returned for a job when using test-only would not be correct.

* Changes in SLURM 2.1.9
========================
 -- In select/linear - Fix logic to prevent over-subscribing memory with shared
    nodes (Shared=YES or Shared=FORCE).
 -- Fix for handling -N and --ntasks-per-node without specifying -n with
    salloc and sbatch.
 -- Fix jobacct_gather/linux if not polling on tasks to give tasks time to
    start before doing initial gather.
 -- When changing priority with the multifactor plugin we make sure we update
    the last_job_update variable.
 -- Fixed sview for gtk < 2.10 to display correct debug level at first.
 -- Fixed sview to not select too fast when using a mouse right click.
 -- Fixed sacct to display correct timelimits for jobs from accounting.
 -- Fixed sacct when running as root by default query all users as documented.
 -- In proctrack/linuxproc, skip over files in /proc that are not really user
    processes (e.g. "/proc/bus").
 -- Fix documentation bug for slurmdbd.conf
 -- Fix slurmctld to update qos preempt list without restart.
 -- Fix bug in select/cons_res that in some cases would prevent a preempting job
    from using of resources already allocated to a preemptable running job.
 -- Fix for sreport in interactive mode to honor parsable/2 options.
 -- Fixed minor bugs in sacct and sstat commands
 -- BLUEGENE - Fixed issue if the slurmd becomes unresponsive and you have
    blocks in an error state accounting is correct when the slurmd comes
    back up.
 -- Corrected documentation for -n option in srun/salloc/sbatch
 -- BLUEGENE - when running a willrun test along with preemption the bluegene
    plugin now does the correct thing.
 -- Fix possible memory corruption issue which can cause slurmctld to abort.
 -- BLUEGENE - fixed small memory leak when setting up env.
 -- Fixed deadlock if using accounting and cluster changes size in the
    database.  This can happen if you mistakenly have multiple primary
    slurmctld's running for a single cluster, which should rarely if ever
    happen.
 -- Fixed sacct -c option.
 -- Critical bug fix in sched/backfill plugin that caused memory corruption.

* Changes in SLURM 2.1.8
========================
 -- Update BUILD_NOTES for AIX and bgp systems on how to get sview to
    build correctly.
 -- Update man page for scontrol when nodes are in the "MIXED" state.
 -- Better error messages for sacctmgr.
 -- Fix bug in allocation of CPUs with select/cons_res and --cpus-per-task
    option.
 -- Fix bug in dependency support for afterok and afternotok options to insure
    that the job's exit status gets checked for dependent jobs prior to puring
    completed job records.
 -- Fix bug in sched/backfill that could set an incorrect expected start time
    for a job.
 -- BLUEGENE - Fix for systems that have midplanes defined in the database
    that don't exist.
 -- Accounting, fixed bug where if removing an object a rollback wasn't
    possible.
 -- Fix possible scontrol stack corruption when listing jobs with very a long
    job or working directory name (over 511 characters).
 -- Insure that SPANK environment variables set by salloc or sbatch get
    propagated to the Prolog on all nodes by setting SLURM_SPANK_* environment
    variables for srun's use.
 -- In sched/wiki2 - Add support for the MODIFYJOB command to alter a job's
    comment field
 -- When a cluster first registers with the SlurmDBD only send nodes in an
    non-usable state.  Before all nodes were sent.
 -- Alter sacct to be able to query jobs by association id.
 -- Edit documentation for scontrol stating ExitCode as something not alterable.
 -- Update documentation about ReturnToService and silently rebooting nodes.
 -- When combining --ntasks-per-node and --exclusive in an allocation request
    the correct thing, giving the allocation the entire node but only
    ntasks-per-node, happens.
 -- Fix accounting transaction logs when deleting associations to put the
    ids instead of the lfts which could change over time.
 -- Fix support for salloc, sbatch and srun's --hint option to avoid allocating
    a job more sockets per node or more cores per socket than desired. Also
    when --hint=compute_bound or --hint=memory_bound then avoid allocating more
    than one task per hyperthread (a change in behavior, but almost certainly
    a preferable mode of operation).

* Changes in SLURM 2.1.7
========================
 -- Modify srun, salloc and sbatch parsing for the --signal option to accept
    either a signal name in addition to the previously supported signal
    numbers (e.g. "--signal=USR2@200").
 -- BLUEGENE - Fixed sinfo --long --Node output for cpus on a single cnode.
 -- In sched/wiki2 - Fix another logic bug in support of Moab being able to
    identify preemptable jobs.
 -- In sched/wiki2 - For BlueGene systems only: Fix bug preventing Moab from
    being able to correctly change the node count of pending jobs.
 -- In select/cons_res - Fix bug preventing job preemption with a configuration
    of Shared=FORCE:1 and PreemptMode=GANG,SUSPEND.
 -- In the TaskProlog, add support for an "unset" option to clear environment
    variables for the user application. Also add support for embedded white-
    space in the environment variables exported to the user application
    (everything after the equal sign to the end of the line is included without
    alteration).
 -- Do not install /etc/init.d/slurm or /etc/init.d/slurmdbd on AIX systems.
 -- BLUEGENE - fixed check for small blocks if a node card of a midplane is
    in an error state other jobs can still run on the midplane on other
    nodecards.
 -- BLUEGENE - Check to make sure job killing is in the active job table in
    DB2 when killing the job.
 -- Correct logic to support ResvOverRun configuration parameter.
 -- Get --acctg-freq option working for srun and salloc commands.
 -- Fix sinfo display of drained nodes correctly with the summarize flag.
 -- Fix minor memory leaks in slurmd and slurmstepd.
 -- Better error messages for failed step launch.
 -- Modify srun to insure compatability of the --relative option with the node
    count requested.

* Changes in SLURM 2.1.6-2
==========================
 -- In sched/wiki2 - Fix logic in support of Moab being able to identify
    preemptable jobs.
 -- Applied fixes to a debug4 message in priority_multifactor.c sent in by
    Per Lundqvist
 -- BLUEGENE - Fixed issue where incorrect nodecards could be picked when
    looking at combining small blocks to make a larger small block.

* Changes in SLURM 2.1.6
========================
 -- For newly submitted jobs, report expected start time in squeue --start as
    "N/A" rather than current time.
 -- Correct sched/backfill logic so that it runs in a more timely fashion.
 -- Fixed issue if running on accounting cache and priority/multifactor to
    initialize the root association when the database comes back up.
 -- Emulated BLUEGENE - fixed issue where blocks weren't always created
    correctly when loading from state.  This does not apply to a real
    bluegene system, only emulated.
 -- Fixed bug when job is completing and its cpu_cnt would be calculated
    incorrectly, possibly resulting in an underflow being logged.
 -- Fixed bug where if there are pending jobs in a partition which was
    updated to have no nodes in it the slurmctld would dump core.
 -- Fixed smap and sview to display partitions with no nodes in them.
 -- Improve configure script's logic to detect LUA libraries.
 -- Fix bug that could cause slurmctld to abort if select/cons_res is used AND a
    job is submitted using the --no-kill option AND one of the job's nodes goes
    DOWN AND slurmctld restarts while that job is still running.
 -- In jobcomp plugins, job time limit was sometimes recorded improperly if not
    set by user (recorded huge number rather than partition's time limit).

* Changes in SLURM 2.1.5
========================
 -- BLUEGENE - Fixed display of draining nodes for sinfo -R.
 -- Fixes to scontrol and sview when setting a job to an impossible start time.
 -- Added -h to srun for help.
 -- Fix for sacctmgr man page to remove erroneous 'with' statements.
 -- Fix for unpacking jobs with accounting statistics, previously it appears
    only steps were unpacked correctly, for the most case sacct would only
    display this information making this fix a very minor one.
 -- Changed scontrol and sview output for jobs with unknown end times from
    'NONE' to 'Unknown'.
 -- Fixed mysql plugin to reset classification when adding a
    previously deleted cluster.
 -- Permit a batch script to reset umask and have that propagate to tasks
    spawed by subsequent srun. Previously the umask in effect when sbatch was
    executed was propagated to tasks spawed by srun.
 -- Modify slurm_job_cpus_allocated_on_node_id() and 
    slurm_job_cpus_allocated_on_node() functions to not write explanation of 
    failures to stderr. Only return -1 and set errno.
 -- Correction in configurator.html script. Prolog and Epilog were reversed.
 -- BLUEGENE - Fixed race condition where if a nodecard has an error on an
    un-booted block when a job comes to use it before the state checking
    thread notices it which could cause the slurmctld to lock up on a
    non-dynamic system.
 -- In select/cons_res with FastSchedule=0 and Procs=# defined for the node, 
    but no specific socket/core/thread count configured, avoid fatal error if 
    the number of cores on a node is less than the number of Procs configured.
 -- Added ability for the perlapi to utilize opaque data types returned from
    the C api.
 -- BLUEGENE - made the perlapi get correct values for cpus per node,
    Previously it would give the number of cpus per cnode instead of midplane.
 -- BLEUGENE - Fixed issue where if a block being selected for a job to use
    and during the process a hardware failure happens, previously the block
    would still be allowed to be used which would fail or requeue the job
    depending on the configuration.
 -- For SPANK job environment, avoid duplicate "SPANK_" prefix for environment
    set by sbatch jobs.
 -- Make squeue select jobs on hidden partitions when requesting more than one.
 -- Avoid automatically cancelling job steps when all of the tasks on some node
    have gracefully terminated.

* Changes in SLURM 2.1.4
========================
 -- Fix for purge script in accounting to use correct options.
 -- If SelectType=select/linear and SelectTypeParameters=CR_Memory fix bug that
    would fail to release memory reserved for a job if "scontrol reconfigure" 
    is executed while the job is in completing state.
 -- Fix bug in handling event trigger for job time limit while job is still 
    in pending state.
 -- Fixed display of Ave/MaxCPU in sacct for jobs. Steps were printed
    correctly.
 -- When node current features differs from slurm.conf, log the node names
    using a hostlist expression rather than listing individual node names.
 -- Improve ability of srun to abort job step for some task launch failures.
 -- Fix mvapich plugin logic to release the created job allocation on 
    initialization failure (previously the failures would cancel job step, 
    but retain job allocation).
 -- Fix bug in srun for task count so large that it overflows int data type.
 -- Fix important bug in select/cons_res handling of ntasks-per-core parameter
    that was uncovered by a bug fixed in v2.1.3. Bug produced fatal error for
    slurmctld: "cons_res: cpus computation error".
 -- Fix bug in select/cons_res handling of partitions configured with 
    Shared=YES. Prior logic failed to support running multiple jobs per node.

* Changes in SLURM 2.1.3-2
==========================
 -- Modified spec file to obsolete pam_slurm when installing
    the slurm-pam_slurm rpm.

* Changes in SLURM 2.1.3-1
==========================
 -- BLUEGENE - Fix issues on static/overlap systems where if a midplane
    was drained you would not be able to create new blocks on it.
 -- In sched/wiki2 (for Moab): Add excluded host list to job information
    using new keyword "EXCLUDE_HOSTLIST".
 -- Correct slurmd reporting of incorrect socket/core/thread counts.  
 -- For sched/wiki2 (Moab): Do not extend a job's end time for suspend/resume
    or startup delay due to node boot time. A job's end time will always be
    its start time plus time limit.
 -- Added build-time option (to configure program) of --with-pam_dir to 
    specify the directory into which PAM modules get installed, although it
    should pick the proper directory by default. "make install" and "rpmbuild"
    should now put the pam_slurm.so file in the proper directory.
 -- Modify PAM module to link against SLURM API shared library and use exported
    slurm_hostlist functions.
 -- Do not block new jobs with --immediate option while another job is in the
    process of being requeued (which can take a long time for some node failure
    modes).
 -- For topology/tree, log invalid hostnames in a single hostlist expression
    rather than one per line.
 -- A job step's default time limit will be UNLIMITED rather than partition's 
    default time limit. The step will automatically be cancelled as part of the
    job termination logic when the job's time limit is reached.
 -- sacct - fixed bug when checking jobs against a reservation
 -- In select/cons_res, fix support for job allocation with --ntasks_per_node
    option. Previously could allocate too few CPUs on some nodes.  
 -- Adjustment made to init message to the slurmdbd to allow backwards
    compatibility with future 2.2 release. YOU NEED TO UPGRADE SLURMDBD
    BEFORE ANYTHING ELSE.
 -- Fix accounting when comment of down/drained node has double quotes in it.

* Changes in SLURM 2.1.2
========================
 -- Added nodelist to sview for jobs on non-bluegene systems
 -- Correction in value of batch job environment variable SLURM_TASKS_PER_NODE
    under some conditions.
 -- When a node silently fails which is already drained/down the reason
    for draining for the node is not changed.
 -- Srun will ignore SLURM_NNODES environment variable and use the count of 
    currently allocated nodes if that count changes during the job's lifetime 
    (e.g. job allocation uses the --no-kill option and a node goes DOWN, job 
    step would previously always fail).
 -- Made it so sacctmgr can't add blank user or account.  The MySQL plugin
    will also reject such requests.
 -- Revert libpmi.so version for compatibility with SLURM version 2.0 and
    earlier to avoid forcing applications using a specific libpmi.so version to
    rebuild unnecessarily (revert from libpmi.so.21.0.0 to libpmi.so.0.0.0).
 -- Restore support for a pending job's constraints (required node features) 
    when slurmctld is restarted (internal structure needed to be rebuilt).
 -- Removed checkpoint_blcr.so from the plugin rpm in the slurm.spec since
    it is also in the blcr rpm.
 -- Fixed issue in sview where you were unable to edit the count
    of jobs to share resources.
 -- BLUEGENE - Fixed issue where tasks on steps weren't being displayed
    correctly with scontrol and sview.
 -- BLUEGENE - fixed wiki2 plugin to report correct task count for pending 
    jobs.
 -- BLUEGENE - Added /etc/ld.so.conf.d/slurm.conf to point to the
    directory holding libsched_if64.so when building rpms.
 -- Adjust get_wckeys call in slurmdbd to allow operators to list wckeys.

* Changes in SLURM 2.1.1
========================
 -- Fix for case sensitive databases when a slurmctld has a mixed case
    clustername to lower case the string to easy compares.
 -- Fix squeue if job is completing and failed to print remaining
    nodes instead of failed message.
 -- Fix sview core when searching for partitions by state.
 -- Fixed setting the start time when querying in sacct to the
    beginning of the day if not set previously.
 -- Defined slurm_free_reservation_info_msg and slurm_free_topo_info_msg
    in common/slurm_protocol_defs.h
 -- Avoid generating error when a job step includes a memory specification and 
    memory is not configured as a consumable resource.
 -- Patch for small memory leak in src/common/plugstack.c
 -- Fix sview search on node state.
 -- Fix bug in which improperly formed job dependency specification can cause
    slurmctld to abort.
 -- Fixed issue where slurmctld wouldn't always get a message to send cluster
    information when registering for the first time with the slurmdbd.
 -- Add slurm_*_trigger.3 man pages for event trigger APIs.
 -- Fix bug in job preemption logic that would free allocated memory twice.
 -- Fix spelling issues (from Gennaro Oliva)
 -- Fix issue when changing parents of an account in accounting all childern
    weren't always sent to their respected slurmctlds until a restart.
 -- Restore support for srun/salloc/sbatch option --hint=nomultithread to 
    bind tasks to cores rather than threads (broken in slurm v2.1.0-pre5).
 -- Fix issue where a 2.0 sacct could not talk correctly to a 2.1 slurmdbd.
 -- BLUEGENE - Fix issue where no partitions have any nodes assigned them to
    alert user no blocks can be created.
 -- BLUEGENE - Fix smap to put BGP images when using -Dc on a Blue Gene/P 
    system.
 -- Set SLURM_SUBMIT_DIR environment variable for srun and salloc commands to
    match behavior of sbatch command.
 -- Report WorkDir from "scontrol show job" command for jobs launched using
    salloc and srun.
 -- Update correctly the wckey when changing it on a pending job.
 -- Set wckeyid correctly in accounting when cancelling a pending job.
 -- BLUEGENE - critical fix where jobs would be killed incorrectly.
 -- BLUEGENE - fix for sview putting multiple ionodes on to nodelists when
    viewing the jobs tab.

* Changes in SLURM 2.1.0
========================
 -- Improve sview layout of blocks in use.
 -- A user can now change the dimensions of the grid in sview.
 -- BLUEGENE - improved startup speed further for large numbers of defined
    blocks
 -- Fix to _get_job_min_nodes() in wiki2/get_jobs.c suggested by Michal Novotny
 -- BLUEGENE - fixed issues when updating a pending job when a node 
    count was incorrect for the asked for connection type.
 -- BLUEGENE - fixed issue when combining blocks that are in ready states to
    make a larger block from those or make multiple smaller blocks by
    splitting the larger block.  Previously this would only work with block
    in a free state.
 -- Fix bug in wiki(2) plugins where if HostFormat=2 and the task list is
    greater than 64 we don't truncate.  Previously this would mess up Moab
    by sending a truncated task list when doing a get jobs.
 -- Added update slurmctld debug level to sview when in admin mode.
 -- Added logic to make sure if enforcing a memory limit when using the
    jobacct_gather plugin a user can no longer turn off the logic to enforce
    the limit.
 -- Replaced many calls to getpwuid() with reentrant uid_to_string()
 -- The slurmstepd will now refresh it's log file handle on a reconfig,
    previously if a log was rolled any output from the stepd was lost.

* Changes in SLURM 2.1.0-pre9
=============================
 -- Added the "scontrol update SlurmctldDebug" as the preferred alternative to
    the "scontrol setdebug" command.
 -- BLUEGENE - made it so when removing a block in an error state the nodes in
    the block are set correctly in accounting as not in error.
 -- Fixed issue where if slurmdbd is not up qos' are set up correctly for
    associations off of cache.
 -- scontrol, squeue, sview all display the correct node, cpu count along with
    correct corresponding nodelist on completing jobs.
 -- Patch (Mark Grondona) fixes serious security vulnerability in SLURM in
    the spank_job_env functionality.
 -- Improve spank_job_env interface and documentation
 -- Add ESPANK_NOT_LOCAL error code to spank_err_t
 -- Made the #define DECAY_INTERVAL used in the priority/multifactor plugin
    a slurm.conf variable (PriorityCalcPeriod)
 -- Added new macro SLURM_VERSION for use in autoconf scripts to determine
    current version of slurm installed on system when building against the api.
 -- Patch from Matthieu Hautreux that adds an entry into the error file when
    a job or step receives a TERM or KILL signal.
 -- Make it so env var SLURM_SRUN_COMM_HOST is overwritten if already in 
    existence in the slurmd.

* Changes in SLURM 2.1.0-pre8
=============================
 -- Rearranged the "scontrol show job" output into functional groupings
 -- Change the salloc/sbatch/srun -P option to -d (dependency)
 -- Removed the srun -d option; must use srun --slurmd-debug instead
 -- When running the mysql plugin natively MUNGE errors are now eliminated 
    when sending updates to slurmctlds.
 -- Check to make sure we have a default account before looking to 
    fill in default association. 
 -- Accounting - Slurmctld and slurmdbd will now set uids of users which were 
    created after the start of the daemons on reconfig.  Slurmdbd will 
    attempt to set previously non-existant uids every hour.
 -- Patch from Aaron Knister and Mark Grondona, to parse correctly quoted 
    #SBATCH options in a batch script.
 -- job_desc_msg_t - in, out, err have been changed to std_in, std_out, 
    and std_err respectfully.  Needed for PySLURM, since Python sees (in) 
    as a keyword.
 -- Changed the type of addr to struct sockaddr_in in _message_socket_accept()
    in sattach.c, step_launch.c, and allocate_msg.c, and moved the function 
    into a common place for all the calls since the code was very similar.
 -- proctrack/lua support has been added see contribs/lua/protrack.lua
 -- replaced local gtk m4 test with AM_PATH_GTK_2_0
 -- changed AC_CHECK_LIB to AC_SEARCH_LIBS to avoid extra libs in
    compile lines.
 -- Patch from Matthieu Hautreux to improve error message in slurmd/req.c
 -- Added support for split groups from (Matthiu Hautreux CEA)
 -- Patch from Mark Grondona to move blcr scripts into pkglibexecdir
 -- Patch from Doug Parisek to calculate a job's projected start time under the
    builtin scheduler.
 -- Removed most global variables out of src/common/jobacct_common.h

* Changes in SLURM 2.1.0-pre7
=============================
 -- BLUEGENE - make 2.1 run correctly on a real bluegene cluster
 -- sacctmgr - Display better debug for when an admin specifies a non-existant 
    parent account when changing parent accounts.
 -- Added a mechanism to the slurmd to defer the epilog from starting until
    after a running prolog has finished.
 -- If a node reboots inbetween checking status the node is marked down unless 
    ReturnToService=2
 -- Added -R option to slurmctld to recover partition state also when 
    restarting or reconfiguring.
 
* Changes in SLURM 2.1.0-pre6
=============================
 -- When getting information about nodes in hidden partitions, return a node
    name of NULL rather than returning no information about the node so that 
    node index information is still valid.
 -- When querying database for jobs in certain state and a time period is 
    given only jobs in that state during the period will be returned,
    previously if a time period was given in sacct jobs eligible to run or 
    running would be displayed, which is still the default if no states are 
    requested.
 -- One can now query jobs based on size (nodes and or cpus) (mysql plugin only)
 -- Applied patch from Mark Grondona that tests for a missing config file before
    any other processing in spank_init().  This now prevents fatal errors from
    being mistakenly treated as recoverable.
 -- --enable-debug no longer has to be stated at configure time to have 
    the slurmctld or slurmstepd dump core on a seg fault.
 -- Moved the errant slurm_job_node_ready() declaration from job_info.h to
    slurm.h and deleted job_info.h.
 -- Added the slurm_job_cpus_allocated_on_node_id() 
    slurm_job_cpus_allocated_on_node() API for working with the 
    job_resources_t structure.
 -- BLUEGENE - speed up start up for systems that have many blocks (100+)
    configured on the system.

* Changes in SLURM 2.1.0-pre5
=============================
 -- Add squeue option "--start" to report expected start time of pending jobs.
 -- Sched/backfill plugin modified to set expected start time of pending jobs.
 -- Add SchedulerParameters option of "max_job_bf=#" to control how far down
    the queue of pending jobs that SLURM searches in an attempt backfill 
    schedule them. The default value is 50 jobs.
 -- Fixed cause of squeue -o "%C" seg fault.
 -- Add -"-signal=<int>@<time>" option to salloc, sbatch and srun commands to
    notify programs before reaching the end of their time limit.
 -- Add scontrol option to update a running job's EndTime (also resets the 
    job's time limit).
 -- Add new job wait reason, ReqNodeNotAvail: Required node is not available 
    (down or drained).
 -- Log when slurmctld or slurmd are started with small core file limit.
 -- Permit job's owner to change features, processor count, minimum and 
    maximun node counts of pending jobs (the operation was previously 
    restricted to user root)
 -- Applied patch from Chuck Clouston for scontrol man page with clarifications
    and additional info
 -- Change slurm errno name from ESLURM_TOO_MANY_REQUESTED_NODES to 
    ESLURM_INVALID_NODE_COUNT to better reflect its meaning.
 -- Fix bug in sched/backfill which could result in invalid memory reference
    when trying to schedule jobs submitted with --exclude option.
 -- Fix for slurmctld deadlock at startup with PreemptMode=SUSPEND,GANG.
 -- Added preemption plugins to RPM.
 -- Completely disable logging of sched/wiki and sched/wiki2 (Maui & Moab) 
    message traffic unless DebugFlag=Wiki is configured.
 -- Change scontrol show job info: ReqProcs (number of processors requested) 
    is replaced by NumProcs (number of processors requested or actually 
    allocated) and ReqNodes (number of nodes requested) is replaced by 
    NumNodes (number of nodes requested or actually allocated).
 -- Fixed issue when max nodes wasn't specified and was later set by limit 
    to not request that as the actual maximum.
 -- Move job preemption (for requeue, checkpoint and kill modes only) out of
    gang scheduling module. Make identification of preemptable jobs an argument
    to the select_g_job_test function rather than calling preempt plugin from
    the select plugin. Make output of srun --test-only option include a list
    of preempted job IDs. 
 -- Better record keeping for front end systems when registering.
 -- Enable memory allocation logic for jobs step (i.e. allocate resources
    within the job's memory allocation and enforce limits).
 -- handle error state in sinfo
 -- sview and "scontrol show config" now report as SLURM_VERSION the version 
    of slurmctld rather than that of the command.
 -- Change SuspendTime configuration parameter from 16-bits to 32-bits.
 -- Add environment variable support to sattach, salloc, sbatch and srun
    to permit user control over exit codes so application exit codes can be
    distiguished from those generated by SLURM. SLURM_EXIT_ERROR specifies the
    exit code when a SLURM error occurs. SLURM_EXIT_IMMEDIATE specifies the 
    exit code when the --immediate option is specified and resources are not
    available. Any other non-zero exit code would be that of the application
    run by SLURM.
 -- Added a Quality of Service (QOS) html page.
 -- In sched/wiki2, JOBWILLRUN command, add support for identification of 
    preemptable and preempted jobs (both new and old format of commands are
    supported).
 -- Remove contribs/python/hostlist files. Download the materials as needed
    directly from http://www.nsc.liu.se/~kent/python-hostlist.
 -- BLUEGENE - Preemption now works on bluegene systems
 -- For salloc, sbatch and srun commands, ignore _maximum_ values for
    --sockets-per-node, --cores-per-socket and --threads-per-core options.
    Remove --mincores, --minsockets, --minthreads options (map them to 
    minimum values of -sockets-per-node, --cores-per-socket and 
    --threads-per-core for now).

* Changes in SLURM 2.1.0-pre4
=============================
 -- Move processing of node configuration information in slurm.conf and 
    topology information in topology.conf from slurmctld into common and load 
    that information into slurmd. Use it to set environment variables for jobs
    SLURM_TOPOLOGY_ADDR and SLURM_TOPOLOGY_ADDR_PATTERN describing the network
    topology for each task. Based upon patch from Mattheu Hautreux (CEA).
 -- Correction in computing a job's TotalProcs value when ThreadsPerCore>1 and
    allocating by cores or sockets.

* Changes in SLURM 2.1.0-pre3
=============================
 -- Removed sched/gang plugin and moved the logic directly into the slurmctld
    daemon so that job preemption and gang scheduling can be used with the
    sched/backfill plugin. Added configuration parameter:
    PreemptMode=gang|off|suspend|cancel|requeue|checkpoint 
    to enable/disable gang scheduling and job preemption logic (both are 
    disabled by default).
    (NOTE: There are some problems with memory management which could prevent a
    job from starting when memory would be freed by a job being requeued or 
    otherwise removed, these are being worked on)
 -- Added PreemptType configuration parameter to identify preemptable jobs.
    Former users of SchedType=sched/gang should set SchedType=sched/backfill,
    PreemptType=preempt/partition_prio and PreemptMode=gang,suspend. See
    web and slurm.conf man page for other options.
    PreemptType=preempt/qos uses Quality Of Service information in database.
 -- In select/linear, optimize job placement across partitions.
 -- If the --partition option is used with the sinfo or squeue command then
    print information about even hidden partitions.
 -- Replaced misc cpu allocation members in job_info_t with select_job_res_t
    which will only be populated when requested (show_flags & SHOW_DETAIL)
 -- Added a --detail option to "scontrol show job" to display the cpu/mem
    allocation info on a node-by-node basis.
 -- Added logic to give correct request uid for individual steps that 
    were cancelled.
 -- Created a spank_get_item() option (S_JOB_ALLOC_MEM) that conveys the memory
    that the select/cons_res plugin has allocated to a job.
 -- BLUEGENE - blocks in error state are now handled correctly in accounting.
 -- Modify squeue to print job step information about a specific job ID using
    the following syntax: "squeue -j <job_id> -s".
 -- BLUEGENE - scontrol delete block and update block can now remove blocks 
    on dynamic laid out systems.