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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 2.5.1
========================
-- Correction to hostlist sorting for hostnames that contain two numeric
components and the first numeric component has various sizes (e.g.
"rack9blade1" should come before "rack10blade1")
-- BGQ - Only poll on initialized blocks instead of calling getBlocks on
each block independently.
-- Fix of task/affinity plugin logic for Power7 processors having hyper-
threading disabled (cpu mask has gaps).
-- Fix of job priority ordering with sched/builtin and priority/multifactor.
Patch from Chris Reed.
* Changes in SLURM 2.5.0
========================
-- Add DenyOnLimit flag for QOS to deny jobs at submission time if they
request resources that reach a 'Max' limit.
-- Permit SlurmUser or operator to change QOS of non-pending jobs (e.g.
running jobs).
-- BGQ - move initial poll to beginning of realtime interaction, which will
also cause it to run if the realtime server ever goes away.
-- Modify sbcast logic to survive slurmd daemon restart while file a
transmission is in progress.
-- Add retry logic to munge encode/decode calls. This is needed if the munge
deamon is under very heavy load (e.g. with 1000 slurmd daemons per compute
node).
-- Add launch and acct_gather_energy plugins to RPMs.
-- Restore support for srun "--mpi=list" option.
-- CRAY - Introduce step accounting for a Cray.
-- Modify srun to abandon I/O 60 seconds after the last task ends. Otherwise
an aborted slurmstepd can cause the srun process to hang indefinitely.
-- ENERGY - RAPL - alter code to close open files (and only open them once
where needed)
-- If the PrologSlurmctld fails, then requeue the job an indefinite number
of times instead of only one time.
-- Added Prolog and Epilog Guide (web page). Based upon work by Jason Sollom,
Cray Inc. and used by permission.
-- Restore gang scheduling functionality. Preemptor was not being scheduled.
Fix for bugzilla #3.
-- Add "cpu_load" to node information. Populate CPULOAD in node information
reported to Moab cluster manager.
-- Preempt jobs only when insufficient idle resources exist to start job,
regardless of the node weight.
-- Added priority/multifactor2 plugin based upon ticket distribution system.
Work by Janne Blomqvist, Aalto University.
-- Add SLURM_NODELIST to environment variables available to Prolog and Epilog.
-- Permit reservations to allow or deny access by account and/or user.
-- Add ReconfigFlags value of KeepPartState. See "man slurm.conf" for details.
-- Modify the task/cgroup plugin adding a task_pre_launch_priv function and
move slurmstepd outside of the step's cgroup. Work by Matthieu Hautreux.
-- Intel MIC processor support added using gres/mic plugin. BIG thanks to
Olli-Pekka Lehto, CSC-IT Center for Science Ltd.
-- Accounting - Change empty jobacctinfo structs to not actually be used
instead of putting 0's into the database we put NO_VALS and have sacct
figure out jobacct_gather wasn't used.
-- Cray - Prevent calling basil_confirm more than once per job using a flag.
-- Fix bug with topology/tree and job with min-max node count. Now try to
get max node count rather than minimizing leaf switches used.
-- Add AccountingStorageEnforce=safe option to provide method to avoid jobs
launching that wouldn't be able to run to completion because of a
GrpCPUMins limit.
-- Add support for RFC 5424 timestamps in logfiles. Disable with configuration
option of "--disable-rfc5424time". By Janne Blomqvist, Aalto University.
-- CRAY - Replace srun.pl with launch/aprun plugin to use srun to wrap the
aprun process instead of a perl script.
-- srun - Rename --runjob-opts to --launcher-opts to be used on systems other
than BGQ.
-- Added new DebugFlags - Energy for AcctGatherEnergy plugins.
-- start deprecation of sacct --dump --fdump
-- BGQ - added --verbose=OFF when srun --quiet is used
-- Added acct_gather_energy/rapl plugin to record power consumption by job.
Work by Yiannis Georgiou, Martin Perry, et. al., Bull
* Changes in SLURM 2.5.0.pre3
=============================
-- Add Google search to all web pages.
-- Add sinfo -T option to print reservation information. Work by Bill Brophy,
Bull.
-- Force slurmd exit after 2 minute wait, even if threads are hung.
-- Change node_req field in struct job_resources from 8 to 32 bits so we can
run more than 256 jobs per node.
-- sched/backfill: Improve accuracy of expected job start with respect to
reservations.
-- sinfo partition field size will be set the the length of the longest
partition name by default.
-- Make it so the parse_time will return a valid 0 if given epoch time and
set errno == ESLURM_INVALID_TIME_VALUE on error instead.
-- Correct srun --no-alloc logic when node count exceeds node list or task
task count is not a multiple of the node count. Work by Hongjia Cao, NUDT.
-- Completed integration with IBM Parallel Environment including POE and IBM's
NRT switch library.
* Changes in SLURM 2.5.0.pre2
=============================
-- When running with multiple slurmd daemons per node, enable specifying a
range of ports on a single line of the node configuration in slurm.conf.
-- Add reservation flag of Part_Nodes to allocate all nodes in a partition to
a reservation and automatically change the reservation when nodes are
added to or removed from the reservation. Based upon work by
Bill Brophy, Bull.
-- Add support for advanced reservation for specific cores rather than whole
nodes. Current limiations: homogeneous cluster, nodes idle when reservation
created, and no more than one reservation per node. Code is still under
development. Work by Alejandro Lucero Palau, et. al, BSC.
-- Add DebugFlag of Switch to log switch plugin details.
-- Correct job node_cnt value in job completion plugin when job fails due to
down node. Previously was too low by one.
-- Add new srun option --cpu-freq to enable user control over the job's CPU
frequency and thus it's power consumption. NOTE: cpu frequency is not
currently preserved for jobs being suspended and later resumed. Work by
Don Albert, Bull.
-- Add node configuration information about "boards" and optimize task
placement on minimum number of boards. Work by Rod Schultz, Bull.
* Changes in SLURM 2.5.0.pre1
=============================
-- Add new output to "scontrol show configuration" of LicensesUsed. Output is
"name:used/total"
-- Changed jobacct_gather plugin infrastructure to be cleaner and easier to
maintain.
-- Change license option count separator from "*" to ":" for consistency with
the gres option (e.g. "--licenses=foo:2 --gres=gpu:2"). The "*" will still
be accepted, but is no longer documented.
-- Permit more than 100 jobs to be scheduled per node (new limit is 250
-- Restructure of srun code to allow outside programs to utilize existing
logic.
* Changes in SLURM 2.4.6
========================
-- Correct WillRun authentication logic when issued for non-job owner.
-- BGQ - Fix to check block for action 'D' if it also has nodes in error.
* Changes in SLURM 2.4.5
========================
-- Cray - On job kill requeust, send SIGCONT, SIGTERM, wait KillWait and send
SIGKILL. Previously just sent SIGKILL to tasks.
-- BGQ - Fix issue when running srun outside of an allocation and only
specifying the number of tasks and not the number of nodes.
-- BGQ - validate correct ntasks_per_node
-- BGQ - when srun -Q is given make runjob be quiet
Morris Jette
committed
-- Modify use of OOM (out of memory protection) for Linux 2.6.36 kernel
or later. NOTE: If you were setting the environment variable
SLURMSTEPD_OOM_ADJ=-17, it should be set to -1000 for Linux 2.6.36 kernel
or later.
-- BGQ - Fix job step timeout actually happen when done from within an
allocation.
-- Reset node MAINT state flag when a reservation's nodes or flags change.
-- Accounting - Fix issue where QOS usage was being zeroed out on a
slurmctld restart.
-- BGQ - Add 64 tasks per node as a valid option for srun when used with
overcommit.
-- BLUEGENE - With Dynamic layout mode - Fix issue where if a larger block
was already in error and isn't deallocating and underlying hardware goes
bad one could get overlapping blocks in error making the code assert when
a new job request comes in.
-- BGQ - handle pending actions on a block better when trying to deallocate it.
-- Accounting - Fixed issue where if nodenames have changed on a system and
you query against that with -N and -E you will get all jobs during that
time instead of only the ones running on -N.
-- Accounting - If a job start message fails to the SlurmDBD reset the db_inx
so it gets sent again. This isn't a major problem since the start will
happen when the job ends, but this does make things cleaner.
-- If an salloc is waiting for an allocation to happen and is canceled by the
user mark the state canceled instead of completed.
-- Fix issue in accounting if a user puts a '\' in their job name.
-- Accounting - Fix for if asking for users or accounts that were deleted
with associations get the deleted associations as well.
-- BGQ - Handle shared blocks that need to be removed and have jobs running
on them. This should only happen in extreme conditions.
-- Fix inconsistency for hostlists that have more than 1 range.
-- BGQ - Add mutex around recovery for the Real Time server to avoid hitting
DB2 so hard.
-- BGQ - If an allocation exists on a block that has a 'D' action on it fail
job on future step creation attempts.
* Changes in SLURM 2.4.4
========================
-- BGQ - minor fix to make build work in emulated mode.
-- BGQ - Fix if large block goes into error and the next highest priority jobs
are planning on using the block. Previously it would fail those jobs
erroneously.
-- BGQ - Fix issue when a cnode going to an error (not SoftwareError) state
with a job running or trying to run on it.
-- Execute slurm_spank_job_epilog when there is no system Epilog configured.
-- Fix for srun --test-only to work correctly with timelimits
-- BGQ - If a job goes away while still trying to free it up in the
database, and the job is running on a small block make sure we free up
the correct node count.
-- BGQ - Logic added to make sure a job has finished on a block before it is
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