How to use the command sdiag (with examples)

The sdiag command is used to show information about the execution of slurmctld. It provides various use cases to fetch performance counters related to slurmctld, reset the counters, specify the output format, and specify the cluster.

Use case 1: Show all performance counters related to the execution of slurmctld

Code:

sdiag --all

Motivation: This use case is useful when you want to monitor and analyze the performance of slurmctld. By showing all the performance counters, you can get detailed insights into the working of slurmctld and identify any performance bottlenecks or issues.

Explanation: The --all option is used to display all the performance counters related to the execution of slurmctld.

Example output:

NodeFailures: 0
NoJobsSent: 3
UpdateKTID: 1

Use case 2: Reset performance counters related to the execution of slurmctld

Code:

sdiag --reset

Motivation: This use case is helpful when you want to reset the performance counters of slurmctld. By resetting the counters, you can start fresh and accurately monitor the performance of slurmctld.

Explanation: The --reset option is used to reset the performance counters related to the execution of slurmctld.

Example output:

Performance counters reset successfully.

Use case 3: Specify the output format

Code:

sdiag --all --json|yaml

Motivation: This use case is beneficial when you want the output to be in a specific format, such as JSON or YAML. It allows you to parse the output programmatically or integrate it with other tools for further analysis.

Explanation: The --json or --yaml options are used to specify the output format. By including either of these options along with the --all option, the output will be generated in the specified format.

Example output:

JSON:

{
   "NodeFailures": 0,
   "NoJobsSent": 3,
   "UpdateKTID": 1
}

YAML:

NodeFailures: 0
NoJobsSent: 3
UpdateKTID: 1

Use case 4: Specify the cluster to send commands to

Code:

sdiag --all --cluster=cluster_name

Motivation: This use case is useful when you have multiple clusters and want to fetch performance counters for a specific cluster. By specifying the cluster name, you can obtain the performance data for that particular cluster.

Explanation: The --cluster option is used to specify the cluster to send commands to. By providing the name of the cluster as an argument to the --cluster option, the performance counters for that specific cluster will be displayed.

Example output:

NodeFailures: 0
NoJobsSent: 3
UpdateKTID: 2

Conclusion:

The sdiag command provides a versatile set of options to fetch performance counters related to the execution of slurmctld, reset the counters, specify the output format, and specify the cluster. These use cases enable better monitoring, analysis, and customization of the command output to fit different needs.