The following are the contents of the RELEASE_NOTES file as distributed with the Slurm source code for this release. Please refer to the NEWS include alongside the source as well for more detailed descriptions of the associated changes, and for bugs fixed within each maintenance release.
RELEASE NOTES FOR SLURM VERSION 18.08 16 August 2018 IMPORTANT NOTES: If using the slurmdbd (Slurm DataBase Daemon) you must update this first. NOTE: If using a backup DBD you must start the primary first to do any database conversion, the backup will not start until this has happened. The 18.08 slurmdbd will work with Slurm daemons of version 17.02 and above. You will not need to update all clusters at the same time, but it is very important to update slurmdbd first and having it running before updating any other clusters making use of it. Slurm can be upgraded from version 17.02 or 17.11 to version 18.08 without loss of jobs or other state information. Upgrading directly from an earlier version of Slurm will result in loss of state information. If using SPANK plugins that use the Slurm APIs, they should be recompiled when upgrading Slurm to a new major release. NOTE FOR THOSE UPGRADING SLURMDBD: The database conversion process from SlurmDBD 16.05 or 17.02 may not work properly with MySQL 5.1 or 5.5 (as was the default version for RHEL 6). Upgrading to a newer version of MariaDB or MySQL is strongly encouraged to prevent this problem. NOTE: The slurmctld is now set to fatal if there are any problems with any state files. To avoid this use the new '-i' flag. NOTE: systemd services files are installed automatically, but not enabled. You will need to manually enable them on the appropriate systems: - Controller: systemctl enable slurmctld - Database: systemctl enable slurmdbd - Compute Nodes: systemctl enable slurmd NOTE: If you are upgrading with any jobs from 14.03 or earlier (i.e. quick upgrade from 14.03 -> 15.08 -> 17.02) you will need to wait until after those jobs are gone before you upgrade to 17.02 or 17.11 or 18.08. NOTE: If you interact with any memory values in a job_submit plugin, you will need to test against NO_VAL64 instead of NO_VAL, and change your printf format as well. NOTE: SPANK options handled in local and allocator contexts should be able to handle being called multiple times. An option could be set multiple times through environment variables and command line options. Environment variables are processed first. NOTE: IBM BlueGene/Q support has been removed. NOTE: Cray/ALPS is deprecated and will be removed in the 19.05 release. You must add the --enable-deprecated option to configure to build for this target. NOTE: Built-in BLCR support is deprecated, no longer built automatically, and will be removed in 19.05. You must add --with-blcr and --enable-deprecated options to configure to build this plugin. NOTE: srun will now only read in the environment variables SLURM_JOB_NODES and SLURM_JOB_NODELIST instead of SLURM_NNODES and SLURM_NODELIST. These latter variables have been obsolete for some time please update any scripts still using them. NOTE: squeue will now print "UID" as the header for the User ID field; corresponding to the %U type specification. NOTE: slurmd and slurmctld will now fatal if two incompatible mechanisms for enforcing memory limits are set. This makes incompatible the use of task/cgroup memory limit enforcing (Constrain[RAM|Swap]Space=yes) with MemLimitEnforce=yes or with JobAcctGatherParams=OverMemoryKill, which could cause problems when a task is killed by one of them while the other is at the same time managing that task. The NoOverMemoryKill setting has been deprecated in favour of OverMemoryKill, since now the default is *NOT* to have any memory enforcement mechanism. HIGHLIGHTS ========== -- Add support for parenthesis in an advanced reservation or job constraint specification to group like options together. For example: --constraint="[(knl&snc4&flat)*4&haswell*1]" might be used to specify that four nodes with the features "knl", "snc4" and "flat" plus one node with the feature "haswell" are required. Nodes with those features currently available will be favored. -- Heterogeneous job steps allocations supported with * Open MPI (with Slurm's PMI2 and PMIx plugins) and * Intel MPI (with Slurm's PMI2 plugin) * No support for Cray systems at this time. -- Disable local PTY output processing when using 'srun --unbuffered'. This prevents the PTY subsystem from inserting extraneous \r characters into the output stream. -- Changed slurmd.service file to include "remote-fs.target" in "After" option. -- The default AuthType for slurmdbd is now "auth/munge". CONFIGURATION FILE CHANGES (see man appropriate man page for details) ===================================================================== -- Add node and partition configuration options of "CpuBind" in slurm.conf to control default task binding. Modify the scontrol to report and modify these parameters. -- Add "NumaCpuBind" option to knl.conf file to automatically change a node's CpuBind parameter based upon changes to a node's NUMA mode. -- Add "ValidateMode" configuration parameter to knl.conf for static MCDRAM/NUMA configurations. -- Add "NodeRebootWeight" option to knl.conf file to modiify a node's scheduling weight when rebooting is required to satify a job's constraints. -- Add "GetSysStatus" option to burst_buffer.conf file. For burst_buffer/cray this would indicate the location of the "dwstat" command. -- Add "SetExecHost" flag to burst_buffer.conf to enable access from login node for interactive jobs -- Configuration parameters "ControlMachine", "ControlAddr", "BackupController" and "BackupAddr" in slurm.conf replaced by an ordered list of "SlurmctldHost" records with the optional address appended to the name enclosed in parenthesis. For example: "SlurmctldHost=head(126.96.36.199)". An arbitrary number of backup servers can be configured. -- Add "SlurmctldPrimaryOnProg" and "SlurmctldPrimaryOffProg" options to slurm.conf to run scripts when primary/backup slurmctld server changes. -- Add "ResumeFailProgram" slurm.conf option to specify a program that is called when a node fails to respond by the configured "ResumeTimeout". -- Remove support for "ChosLoc" configuration parameter. -- Add SlurmctldParameters option allow_user_triggers to enable user-defined triggers. User defined triggers are now disabled by default. -- ConstrainKmemSpace is now disabled by default. In Linux kernel version 3, early versions of kernel version 4, and RedHat/CentOS 6 and 7, using memory.kmem.limit_in_bytes leaks slab caches, which eventually causes the machine to be unable to create new cgroups. -- SchedulerParameters' "whole_pack" option has been renamed to "whole_hetjob", although "whole_pack" will still be supported for backward compatibility. -- Cray: Add "CheckGhalQuiesce" to "CommunicationParameters" in slurm.conf. -- Remove requirement to have cgroup_allowed_devices_file.conf in order to constrain devices. By default all devices are allowed and GRES, that are associated with a device file, that are not requested are restricted. COMMAND CHANGES (see man pages for details) =========================================== -- Add sbatch "--batch" option to identify features required on batch node. For example "sbatch --batch=haswell ...". -- sacct can report all information about all components of a heterogeneous job allocation with "--whole-hetjob=yes" option. -- Report cgroup and NodeFeatures plugin configuration with scontrol and sview commands. -- Add "scontrol show dwstat" command to display Cray burst buffer status. -- Remove the "CPUErr" value from the slurm_print_node_table() API call ("scontrol show node"). This was always zero for non-BlueGene systems. -- srun command returns the highest signal of any task. -- Add salloc/sbatch/srun option of "--gres-flags=disable-binding" to disable filtering of CPUs with respect to generic resource locality. This option is currently required to use more CPUs than are bound to a GRES (i.e. if a GPU is bound to the CPUs on one socket, but resources on more than one socket are required to run the job). -- Add name of partition used to output of "srun --test-only ...". This is valuable for jobs submitted to multiple partitions. -- Add job reason "ReqNodeNotAvail, reserved for maintenance". -- "scontrol reboot" enhancements: - Add ability to specify node reason - Add ability to specify node state after reboot completion -- sdiag command enhancements: - Report outgoing message queue contents - Report pending job count -- Add scontrol ability to create/update "TRESBillingWeights". -- Remove "AdminComment +=" syntax from "scontrol update job". -- Add sacctmgr options to prevent/manage job queue stuffing: - GrpJobsAccrue=
Maximum number of pending jobs in aggregate able to accrue age priority for this association and all associations which are children of this association. To clear a previously set value use the modify command with a new value of -1. - MaxJobsAccrue= Maximum number of pending jobs able to accrue age priority at any given time for the given association. This is overridden if set directly on a user. Default is the cluster's limit. To clear a previously set value use the modify command with a new value of -1. - MinPrioThreshold Minimum priority required to reserve resources when scheduling. OTHER CHANGES ============= -- Add new job state of SO/STAGE_OUT indicating that burst buffer stage-out operation is in progress. -- Add new burst buffer state of "teardown-fail". -- Burst buffer errors logged to new job "SystemComment" field. -- Enable jobs with zero node count for creation and/or deletion of persistent burst buffers. -- Avoid terminating other processes in a task group when any task is core dumping to avoid incomplete OpenMP core files. -- Append ", with requeued tasks" to end of job array "end" email when any task is requeued. This is a hint to use "sacct --duplicates" to see all job accounting information. -- Consider nodes in "Resuming" state as available for backfill future scheduling and do not replace in advanced reservations. -- Explicitly shutdown the slurmd daemon when reboot requested. -- Calculate TRES billing values at job submission to enforce QOS DenyOnLimit configuration. -- Add acct_gather_profile/influxdb plugin to store job profiling information to InfluxDB rather than HDF5.