Provided by: slurm-client_21.08.5-2ubuntu1_amd64 
NAME
sdiag - Scheduling diagnostic tool for Slurm
SYNOPSIS
sdiag
DESCRIPTION
sdiag shows information related to slurmctld execution about: threads, agents, jobs, and scheduling
algorithms. The goal is to obtain data from slurmctld behaviour helping to adjust configuration
parameters or queues policies. The main reason behind is to know Slurm behaviour under systems with a
high throughput.
It has two execution modes. The default mode --all shows several counters and statistics explained later,
and there is another execution option --reset for resetting those values.
Values are reset at midnight UTC time by default.
The first block of information is related to global slurmctld execution:
Server thread count
The number of current active slurmctld threads. A high number would mean a high load processing
events like job submissions, jobs dispatching, jobs completing, etc. If this is often close to
MAX_SERVER_THREADS it could point to a potential bottleneck.
Agent queue size
Slurm design has scalability in mind and sending messages to thousands of nodes is not a trivial
task. The agent mechanism helps to control communication between slurmctld and the slurmd daemons
for a best effort. This value denotes the count of enqueued outgoing RPC requests in an internal
retry list.
Agent count
Number of agent threads. Each of these agent threads can create in turn a group of up to 2 +
AGENT_THREAD_COUNT active threads at a time.
Agent thread count
Total count of active threads created by all the agent threads.
DBD Agent queue size
Slurm queues up the messages intended for the SlurmDBD and processes them in a separate thread. If
the SlurmDBD, or database, is down then this number will increase.
The max queue size is configured in the slurm.conf with MaxDBDMsgs. If this number begins to grow
more than half of the max queue size, the slurmdbd and the database should be investigated
immediately.
Jobs submitted
Number of jobs submitted since last reset
Jobs started
Number of jobs started since last reset. This includes backfilled jobs.
Jobs completed
Number of jobs completed since last reset.
Jobs canceled
Number of jobs canceled since last reset.
Jobs failed
Number of jobs failed due to slurmd or other internal issues since last reset.
Job states ts:
Lists the timestamp of when the following job state counts were gathered.
Jobs pending:
Number of jobs pending at the given time of the time stamp above.
Jobs running:
Number of jobs running at the given time of the time stamp above.
Jobs running ts:
Time stamp of when the running job count was taken.
The next block of information is related to main scheduling algorithm based on jobs priorities. A
scheduling cycle implies to get the job_write_lock lock, then trying to get resources for jobs pending,
starting from the most priority one and going in descendent order. Once a job can not get the resources
the loop keeps going but just for jobs requesting other partitions. Jobs with dependencies or affected
by accounts limits are not processed.
Last cycle
Time in microseconds for last scheduling cycle.
Max cycle
Maximum time in microseconds for any scheduling cycle since last reset.
Total cycles
Total run time in microseconds for all scheduling cycles since last reset. Scheduling is
performed periodically and (depending upon configuration) when a job is submitted or a job is
completed.
Mean cycle
Mean time in microseconds for all scheduling cycles since last reset.
Mean depth cycle
Mean of cycle depth. Depth means number of jobs processed in a scheduling cycle.
Cycles per minute
Counter of scheduling executions per minute.
Last queue length
Length of jobs pending queue.
The next block of information is related to backfilling scheduling algorithm. A backfilling scheduling
cycle implies to get locks for jobs, nodes and partitions objects then trying to get resources for jobs
pending. Jobs are processed based on priorities. If a job can not get resources the algorithm calculates
when it could get them obtaining a future start time for the job. Then next job is processed and the
algorithm tries to get resources for that job but avoiding to affect the previous ones, and again it
calculates the future start time if not current resources available. The backfilling algorithm takes more
time for each new job to process since more priority jobs can not be affected. The algorithm itself takes
measures for avoiding a long execution cycle and for taking all the locks for too long.
Total backfilled jobs (since last slurm start)
Number of jobs started thanks to backfilling since last slurm start.
Total backfilled jobs (since last stats cycle start)
Number of jobs started thanks to backfilling since last time stats where reset. By default these
values are reset at midnight UTC time.
Total backfilled heterogeneous job components
Number of heterogeneous job components started thanks to backfilling since last Slurm start.
Total cycles
Number of backfill scheduling cycles since last reset
Last cycle when
Time when last backfill scheduling cycle happened in the format "weekday Month MonthDay
hour:minute.seconds year"
Last cycle
Time in microseconds of last backfill scheduling cycle. It counts only execution time, removing
sleep time inside a scheduling cycle when it executes for an extended period time. Note that
locks are released during the sleep time so that other work can proceed.
Max cycle
Time in microseconds of maximum backfill scheduling cycle execution since last reset. It counts
only execution time, removing sleep time inside a scheduling cycle when it executes for an
extended period time. Note that locks are released during the sleep time so that other work can
proceed.
Mean cycle
Mean time in microseconds of backfilling scheduling cycles since last reset.
Last depth cycle
Number of processed jobs during last backfilling scheduling cycle. It counts every job even if
that job can not be started due to dependencies or limits.
Last depth cycle (try sched)
Number of processed jobs during last backfilling scheduling cycle. It counts only jobs with a
chance to start using available resources. These jobs consume more scheduling time than jobs which
are found can not be started due to dependencies or limits.
Depth Mean
Mean count of jobs processed during all backfilling scheduling cycles since last reset. Jobs
which are found to be ineligible to run when examined by the backfill scheduler are not counted
(e.g. jobs submitted to multiple partitions and already started, jobs which have reached a QOS or
account limit such as maximum running jobs for an account, etc).
Depth Mean (try sched)
The subset of Depth Mean that the backfill scheduler attempted to schedule.
Last queue length
Number of jobs pending to be processed by backfilling algorithm. A job is counted once for each
partition it is queued to use. A pending job array will normally be counted as one job (tasks of
a job array which have already been started/requeued or individually modified will already have
individual job records and are each counted as a separate job).
Queue length Mean
Mean count of jobs pending to be processed by backfilling algorithm. A job is counted once for
each partition it requested. A pending job array will normally be counted as one job (tasks of a
job array which have already been started/requeued or individually modified will already have
individual job records and are each counted as a separate job).
Last table size
Count of different time slots tested by the backfill scheduler in its last iteration.
Mean table size
Mean count of different time slots tested by the backfill scheduler. Larger counts increase the
time required for the backfill operation. The table size is influenced by many schuling
parameters, including: bf_min_age_reserve, bf_min_prio_reserve, bf_resolution, and bf_window.
Latency for 1000 calls to gettimeofday()
Latency of 1000 calls to the gettimeofday() syscall in microseconds, as measured at controller
startup.
The next blocks of information report the most frequently issued remote procedure calls (RPCs), calls
made for the Slurmctld daemon to perform some action. The fourth block reports the RPCs issued by
message type. You will need to look up those RPC codes in the Slurm source code by looking them up in
the file src/common/slurm_protocol_defs.h. The report includes the number of times each RPC is invoked,
the total time consumed by all of those RPCs plus the average time consumed by each RPC in microseconds.
The fifth block reports the RPCs issued by user ID, the total number of RPCs they have issued, the total
time consumed by all of those RPCs plus the average time consumed by each RPC in microseconds. RPCs
statistics are collected for the life of the slurmctld process unless explicitly --reset.
The sixth block of information, labeled Pending RPC Statistics, shows information about pending outgoing
RPCs on the slurmctld agent queue. The first section of this block shows types of RPCs on the queue and
the count of each. The second section shows up to the first 25 individual RPCs pending on the agent
queue, including the type and the destination host list. This information is cached and only refreshed
on 30 second intervals.
OPTIONS
-a, --all
Get and report information. This is the default mode of operation.
-M, --cluster=<string>
The cluster to issue commands to. Only one cluster name may be specified. Note that the SlurmDBD
must be up for this option to work properly.
-h, --help
Print description of options and exit.
-r, --reset
Reset scheduler and RPC counters to 0. Only supported for Slurm operators and administrators.
-i, --sort-by-id
Sort Remote Procedure Call (RPC) data by message type ID and user ID.
-t, --sort-by-time
Sort Remote Procedure Call (RPC) data by total run time.
-T, --sort-by-time2
Sort Remote Procedure Call (RPC) data by average run time.
--usage
Print list of options and exit.
-V, --version
Print current version number and exit.
PERFORMANCE
Executing sdiag sends a remote procedure call to slurmctld. If enough calls from sdiag or other Slurm
client commands that send remote procedure calls to the slurmctld daemon come in at once, it can result
in a degradation of performance of the slurmctld daemon, possibly resulting in a denial of service.
Do not run sdiag or other Slurm client commands that send remote procedure calls to slurmctld from loops
in shell scripts or other programs. Ensure that programs limit calls to sdiag to the minimum necessary
for the information you are trying to gather.
ENVIRONMENT VARIABLES
Some sdiag options may be set via environment variables. These environment variables, along with their
corresponding options, are listed below. (Note: Command line options will always override these
settings.)
SLURM_CLUSTERS Same as --cluster
SLURM_CONF The location of the Slurm configuration file.
COPYING
Copyright (C) 2010-2011 Barcelona Supercomputing Center.
Copyright (C) 2010-2021 SchedMD LLC.
Slurm is free software; you can redistribute it and/or modify it under the terms of the GNU General
Public License as published by the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
Slurm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
SEE ALSO
sinfo(1), squeue(1), scontrol(1), slurm.conf(5),
May 2021 Slurm Commands sdiag(1)