Release Notes #

The template slurmrestd.service unit file now defaults to listen on both the Unix socket and the slurmrestd port.

The template slurmrestd.service unit file now defaults to enable auth/jwt and the munge unit is no longer a dependency by default.

Add extra “EnvironmentFile=-/etc/default/$service” setting to service files.

Allow jobs to pack onto nodes already rebooting with the desired features.

Reset job start time after nodes are rebooted, previously only done for cloud/power save boots.

Node features (if any) are passed to RebootProgram if run from slurmctld.

Fail srun when using invalid --cpu-bind options (e.g. --cpu-bind=map_cpu:99 when only 10 CPUs are allocated).

Storing batch scripts and env vars are now in indexed tables using substantially less disk space. Those storing scripts in 21.08 will all be moved and indexed automatically.

Run MailProg through slurmscriptd instead of directly fork+exec()'ing from slurmctld.

Add acct_gather_interconnect/sysfs plugin.

Future and Cloud nodes are treated as "Planned Down" in usage reports.

Add new shard plugin for sharing GPUs but not with mps.

Add support for Lenovo SD650 V2 in acct_gather_energy/xcc plugin.

Remove cgroup_allowed_devices_file.conf, since the default policy in modern kernels is to whitelist by default. Denying specific devices must be done through gres.conf.

Node state flags (DRAIN, FAILED, POWERING UP, etc.) will be cleared now if node state is updated to FUTURE.

srun will no longer read in SLURM_CPUS_PER_TASK. This means you will implicitly have to specify --cpus-per-task on your srun calls, or set the new SRUN_CPUS_PER_TASK environment variable to accomplish the same thing.

Remove connect_timeout and timeout options from JobCompParams as there’s no longer a connectivity check happening in the jobcomp/elasticsearch plugin when setting the location off of JobCompLoc.

Add support for hourly reoccurring reservations.

Allow nodes to be dynamically added and removed from the system. Configure MaxNodeCount to accomodate nodes created with dynamic node registrations (slurmd -Z --conf="") and scontrol.

Added support for Cgroup Version 2.

sacct - allocations made by srun will now always display the allocation and step(s). Previously, the allocation and step were combined when possible.

cons_tres - change definition of the "least loaded node" (LLN) to the node with the greatest ratio of available CPUs to total CPUs.

Add support to ship Include configuration files with configless.

Provide a detailed reason in the job log as to why it has been terminated when hitting a resource limit.

Pass and use alias_list through credential instead of environment variable.

Add ability to get host addresses from nss_slurm.

Enable reverse fanout for cloud+alias_list jobs.

Add support to delete/update nodes by specifying nodesets or the 'ALL' keyword alongside the delete/update node message nodelist expression (i.e. scontrol delete/update NodeName=ALL or scontrol delete/update NodeName=ns1,nodes[1-3]).

Expanded the set of environment variables accessible through Prolog/Epilog and PrologSlurmctld/EpilogSlurmctld to include SLURM_JOB_COMMENT, SLURM_JOB_STDERR, SLURM_JOB_STDIN, SLURM_JOB_STDOUT, SLURM_JOB_PARTITION, SLURM_JOB_ACCOUNT, SLURM_JOB_RESERVATION, SLURM_JOB_CONSTRAINTS, SLURM_JOB_NUM_HOSTS, SLURM_JOB_CPUS_PER_NODE, SLURM_JOB_NTASKS, and SLURM_JOB_RESTART_COUNT.

Attempt to requeue jobs terminated by slurm.conf changes (node vanish, node socket/core change, etc). Processes may still be running on excised nodes. Admin should take precautions when removing nodes that have jobs on running on them.

Add switch/hpe_slingshot plugin.

Add new SchedulerParameters option bf_licenses to track licenses as within the backfill scheduler.

AcctGatherEnergyType rsmi is now gpu.

TaskAffinity parameter was removed from cgroup.conf.

Fatal if the mutually-exclusive JobAcctGatherParams options of UsePss and NoShared are both defined.

KeepAliveTime has been moved into CommunicationParameters. The standalone option will be removed in a future version.

preempt/qos - add support for WITHIN mode to allow for preemption between jobs within the same QOS.

Fatal error if CgroupReleaseAgentDir is configured in cgroup.conf. The option has long been obsolete.

Fatal if more than one burst buffer plugin is configured.

Added keepaliveinterval and keepaliveprobes to CommunicationParameters.

Added new max_token_lifespan=<seconds> to AuthAltParameters to allow sites to restrict the lifespan of any requested ticket by an unprivileged user.

Disallow slurm.conf node configurations with NodeName=ALL.

Remove support for (non-functional) --cpu-bind=boards.

Added --prefer option at job submission to allow for 'soft' constraints.

Add condflags=open to sacctmgr show events to return open/currently down events.

sacct -f flag implies -c flag.

srun --overlap now allows the step to share all resources (CPUs, memory, and GRES), where previously --overlap only allowed the step to share CPUs with other steps.

openapi/v0.0.35 - Plugin has been removed.

burst_buffer plugins - err_msg added to bb_p_job_validate().

openapi - added flags to slurm_openapi_p_get_specification(). Existing plugins only need to update their prototype for the function as manipulating the flags pointer is optional.

openapi - Added OAS_FLAG_MANGLE_OPID to allow plugins to request that the operationId of path methods be mangled with the full path to ensure uniqueness.

openapi/[db]v0.0.36 - Plugins have been marked as deprecated and will be removed in the next major release.

switch plugins - add switch_g_job_complete() function.

Removed gres/mic plugin used to support Xeon Phi coprocessors.

Add LimitFactor to the QOS. A float that is factored into an associations GrpTRES limits. For example, if the LimitFactor is 2, then an association with a GrpTRES of 30 CPUs, would be allowed to allocate 60 CPUs when running under this QOS.

A job’s next_step_id counter now resets to 0 after being requeued. Previously, the step id’s would continue from the job’s last run.

API change: Removed slurm_kill_job_msg and modified the function signature for slurm_kill_job2. slurm_kill_job2 should be used instead of slurm_kill_job_msg.

AccountingStoreFlags=job_script allows you to store the job’s batch script.

AccountingStoreFlags=job_env allows you to store the job’s env vars.

Removed sched/hold plugin.

cli_filter/lua, jobcomp/lua, job_submit/lua now load their scripts from the same directory as the slurm.conf file (and thus now will respect changes to the SLURM_CONF environment variable).

SPANK - call slurm_spank_init if defined without slurm_spank_slurmd_exit in slurmd context.

Add new PLANNED state to a node to represent when the backfill scheduler has it planned to be used in the future instead of showing as IDLE. sreport also has changed it’s cluster utilization report column name from 'Reserved' to 'Planned' to match this nomenclature.

Put node into INVAL state upon registering with an invalid node configuration. Node must register with a valid configuration to continue.

Remove SLURM_DIST_LLLP environment variable in favor of just SLURM_DISTRIBUTION.

Make --cpu-bind=threads default for --threads-per-core — can be overridden by the CLI or an environment variable.

slurmd - allow multiple comma-separated controllers to be specified in configless mode with --conf-server

Manually powering down of nodes with scontrol now ignores SuspendExc<Nodes|Parts>.

Distinguish queued reboot requests (REBOOT@) from issued reboots (REBOOT^).

auth/jwt - add support for RS256 tokens. Also permit the username in the 'username' field in addition to the 'sun' (Slurm UserName) field.

service files - change dependency to network-online rather than just network to ensure DNS and other services are available.

Add "Extra" field to node to store extra information other than a comment.

Add ResumeTimeout, SuspendTimeout and SuspendTime to Partitions.

The memory.force_empty parameters is no longer set by jobacct_gather/cgroup when deleting the cgroup`. This previously caused a significant delay (~2s) when terminating a job, and is not believed to have provided any perceivable benefit. However, this may lead to slightly higher reported kernel mem page cache usage since the kernel cgroup memory is no longer freed immediately.

TaskPluginParam=verbose is now treated as a default. Previously it would be applied regardless of the job specifying a --cpu-bind.

Add node_reg_mem_percent SlurmctldParameter to define percentage of memory nodes are allowed to register with.

Define and separate node power state transitions. Previously a powering down node was in both states, POWERING_OFF and POWERED_OFF. These are now separated. e.g. IDLE+POWERED_OFF (IDLE~) → IDLE+POWERING_UP (IDLE#) - Manual power up or allocation → IDLE → IDLE+POWER_DOWN (IDLE!) - Node waiting for power down → IDLE+POWERING_DOWN (IDLE%) - Node powering down → IDLE+POWERED_OFF (IDLE~) - Powered off

Some node state flag names have changed. These would be noticeable for example if using a state flag to filter nodes with sinfo. e.g. POWER_UP → POWERING_UP POWER_DOWN → POWERED_DOWN POWER_DOWN now represents a node pending power down

Create a new process called slurmscriptd which runs PrologSlurmctld and EpilogSlurmctld. This avoids fork() calls from slurmctld, and can avoid performance issues if the slurmctld has a large memory footprint.

Pass JSON of job to node mappings to ResumeProgram.

QOS accrue limits only apply to the job QOS, not partition QOS.

Any return code from SPANK plugin or SPANK function that is not SLURM_SUCCESS (zero) will be considered to be an error. Previously, only negative return codes were considered an error.

Add support for automatically detecting and broadcasting executable shared object dependencies for sbcast and srun --bcast.

All SPANK error codes now start at 3000. Where previously SPANK would give a return code of 1, it will now return 3000. This change will break ABI compatibility with SPANK plugins compiled against older version of Slurm.

SPANK plugins are now required to match the current Slurm release, and must be recompiled for each new Slurm major release. (They do not need to be recompiled when upgrading between maintenance releases.)

SLURM_NODE_ALIASES now has brackets around the node’s address to be able to distinguish IPv6 addresses. e.g. <node_name>:[<node_addr>]:<node_hostname>

The job_container/tmpfs plugin now requires PrologFlags=contain to be set in slurm.conf.

Limit max_script_size to 512 MB.

Errors detected in the parser handlers due to invalid configurations are now propagated and can lead to fatal (and thus exit) the calling process.

Enforce a valid configuration for AccountingStorageEnforce in slurm.conf. If the configuration is invalid, then an error message will be printed and the command or daemon (including slurmctld) will not run.

Removed AccountingStoreJobComment option. Please update your config to use AccountingStoreFlags=job_comment instead.

Removed DefaultStorage{Host,Loc,Pass,Port,Type,User} options.

Removed CacheGroups, CheckpointType, JobCheckpointDir, MemLimitEnforce, SchedulerPort, SchedulerRootFilter options.

Added Script to DebugFlags for debugging slurmscriptd (the process that runs slurmctld scripts such as PrologSlurmctld and EpilogSlurmctld).

Rename SbcastParameters to BcastParameters.

systemd service files - add new “-s” option to each daemon which will change the working directory even with the -D option. (Ensures any core files are placed in an accessible location, rather than /.)

Added BcastParameters=send_libs and BcastExclude options.

Remove the (incomplete) burst_buffer/generic plugin.

Make SelectTypeParameters=CR_Core_Memory default for cons_tres and cons_res.

Remove support for TaskAffinity=yes in cgroup.conf. Adding task/affinity to TaskPlugins in slurm.conf is strongly recommended instead.

Changed the --format handling for negative field widths (left justified) to apply to the column headers as well as the printed fields.

Invalidate multiple partition requests when using partition based associations.

scrontab - create the temporary file under the TMPDIR environment variable (if set), otherwise continue to use TmpFS as configured in slurm.conf.

sbcast / srun --bcast - removed support for zlib compression. lz4 is vastly superior in performance, and (counter-intuitively) zlib could provide worse performance than no compression at all on many systems.

sacctmgr - changed column headings to ParentID and ParentName instead of Par ID and "Par Name` respectively.

SALLOC_THREADS_PER_CORE and SBATCH_THREADS_PER_CORE have been added as input environment variables for salloc and sbatch, respectively. They do the same thing as --threads-per-core.

Don’t display node’s comment with scontrol show nodes unless set.

Added SLURM_GPUS_ON_NODE environment variable within each job/step.

sreport - change to sorting TopUsage by the --tres option.

slurmrestd - do not run allow operation as SlurmUser/root by default.

scontrol show node now shows State as base_state+flags instead of shortened state with flags appended. eg. IDLE# → IDLE+POWERING_UP. Also POWER state flag string is POWERED_DOWN.

scrontab - add ability to update crontab from a file or standard input.

scrontab - added ability to set and expand variables.

Make srun sensitive to BcastParameters.

Added sbcast/srun --send-libs, sbcast --exclude and srun --bcast-exclude.

Changed ReqMem field in sacct to match memory from ReqTRES. It now shows the requested memory of the whole job with a letter appended indicating units (M for megabytes, G for gigabytes, etc.). ReqMem is only displayed for the job, since the step does not have requested TRES. Previously ReqMem was also displayed for the step but was just displaying ReqMem for the job.

jobcomp plugin: change plugin API to jobcomp_p_*().

sched plugin: change plugin API to sched_p_*() and remove slurm_sched_p_initial_priority() call.

step_ctx code has been removed from the api.

slurm_stepd_get_info()/stepd_get_info() has been removed from the api.

The v0.0.35 OpenAPI plugin has now been marked as deprecated. Please convert your requests to the v0.0.37 OpenAPI plugin.