I'm trying to use pmcstat to profile userspace time used in
Squid. I just can't seem to get pmcstat to report anything
useful.
The last thing I tried was something like:
# pmcstat -O file -P instructions -t <pid of squid>
# pmcstat -R file -g
# ls k7-retired-instructions
kernel.gmon
There doesn't seem to be a good example for
process-based counting stuff with PMC. Could anyone
give me a hand?
Thanks!
I can think of one of two scenarios:
1) the squid process was in the kernel when the
samples got taken. This could happen if the
process was say in select() handling all the time.
2) There a bug in my process handling code that is
being triggered (hwpmc undercounts process-mode
samples), and samples are being missed.
Regards,
Koshy
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