From a465a41c6e6905f3f47b8e6398fedf2ce3082578 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Pt=C3=A1=C4=8Dek?= <petr.ptacek@vsb.cz>
Date: Thu, 20 Mar 2025 12:38:32 +0100
Subject: [PATCH] ADD, added mon-flops job feature description
---
docs.it4i/general/karolina-slurm.md | 10 ++++++++++
docs.it4i/job-features.md | 15 +++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/docs.it4i/general/karolina-slurm.md b/docs.it4i/general/karolina-slurm.md
index 4fe93e079..43ceb0782 100644
--- a/docs.it4i/general/karolina-slurm.md
+++ b/docs.it4i/general/karolina-slurm.md
@@ -43,6 +43,14 @@ On Karolina cluster
Division of nodes means that if two users allocate a portion of the same node, they can see each other's running processes.
If this solution is inconvenient for you, consider allocating a whole node.
+
+IT4I clusters are monitored for resources utilization.
+One of the monitoring daemons is using registers to collect performance
+monitoring counters (PMC), which user may need when analysing performance
+of the executed application (perf or [Score-P][10] profiling tools).
+To deactivate the daemon and release the respective registers set job feature
+during allocation, as specified [here][9].
+
## Using CPU Queues
Access [standard compute nodes][4].
@@ -173,3 +181,5 @@ $ salloc -A PROJECT-ID -p qviz --exclusive
[6]: /karolina/compute-nodes/#data-analytics-compute-node
[7]: /karolina/visualization/
[8]: ./karolina-partitions.md
+[9]: /job-features.md/#cluster-monitoring
+[10]: /software/debuggers/score-p/
\ No newline at end of file
diff --git a/docs.it4i/job-features.md b/docs.it4i/job-features.md
index 4bf46fe99..ede779c79 100644
--- a/docs.it4i/job-features.md
+++ b/docs.it4i/job-features.md
@@ -115,6 +115,21 @@ $ salloc ... --comment "use:msr=version_string"
!!! Warning
Available on Barbora nodes only.
+!!! Warning
+ It is recommended to combine with setting the feature `mon-flops=off`.
+
+## Cluster Monitoring
+
+Disable monitoring of certain registers which are used to collect performance
+monitoring counters (PMC) values such as CPU FLOPs or Memory Bandwidth:
+
+```console
+$ salloc ... --comment "use:mon-flops=off"
+```
+
+!!! Warning
+ Available on Karolina nodes only.
+
## HDEEM Support
Load the HDEEM software stack. The [High Definition Energy Efficiency Monitoring][b] (HDEEM) library is a software interface used to measure power consumption of HPC clusters with bullx blades.
--
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