[gpfsug-discuss] mmfsd recording High CPU usage

[Saula, Oluwasijibomi]

Hello Scalers,


First, let me say Happy Thanksgiving to those of us in the US and to those beyond, well, it's a still happy day seeing we're still above ground! 😊


Now, what I have to discuss isn't anything extreme so don't skip the turkey for this, but lately, on a few of our compute GPFS client nodes, we've been noticing high CPU usage by the mmfsd process and are wondering why. Here's a sample:


[~]# top -b -n 1 | grep mmfs

   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND


231898 root       0 -20 14.508g 4.272g  70168 S  93.8  6.8  69503:41 mmfsd

  4161 root       0 -20  121876   9412   1492 S   0.0  0.0   0:00.22 runmmfs


Obviously, this behavior was likely triggered by a not-so-convenient user job that in most cases is long finished by the time we investigate. Nevertheless, does anyone have an idea why this might be happening? Any thoughts on preventive steps even?


This is GPFS v4.2.3 on Redhat 7.4, btw...


Thanks,

Siji Saula
HPC System Administrator
Center for Computationally Assisted Science & Technology
NORTH DAKOTA STATE UNIVERSITY


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