ADD, added mon-flops job feature description

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

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.