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AlgebraicMirror's avatar
AlgebraicMirror
Icon for Altostratus rankAltostratus
Oct 18, 2011

Strange F5 ASM Sawtooth CPU Graph

A couple of my ASM 3600s have odd sawtooth patterns on their CPU performance graphs. Approximately every three minutes, CPU spikes, and then shortly afterword goes back down.     Using top, I wa...
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Algebraic_Mirror's avatar
Algebraic_Mirror
Icon for Cirrostratus rankCirrostratus
Oct 25, 2011
It doesn't look to be the clean_db.pl script, but I think this is very much on the right track! That directory "/usr/share/ts/bin" that contains the clean_db.pl script ALSO contains a huge number of other scripts that operate on the database. I'm pretty sure it's one of them. I guess I'm not going to dig too much deeper, since this is starting to look like normal operation. If it starts hurting performance I'll file a ticket, but since it spikes the CPU for one minute and then backs off for two minutes, things stay caught up and nothing gets too hurt.

 

 

Also, I need to modify my original post: my newly rebuilt ASM is starting to show this problem again, but to a lesser degree. My guess is that because it has been up for a much shorter period, it has a smaller database and queries execute faster. As the DB grows, the queries must slow down and cause CPU spikes, giving me this sawtooth pattern.