intel-cmt-cat

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The pqos tool fails with the following errors on systems with 300 or more CPU cores. $pqos NOTE: Mixed use of MSR and kernel interfaces to manage CAT or CMT & MBM may lead to unexpected behavior. ERROR: Could not open /sys/fs/resctrl directory ERROR: Failed to stop resctrl events ERROR: Failed to start all selected OS monitoring events Monitoring start error on core(s) 339, status 1

By default, the file descriptor limit is set to 1024 for a session. pqos monitor uses 3 descriptors for each CPU for perf monitoring. So, it runs out of limit(1024) on systems with 300 or more CPUs.