Re: [perfmon2] Pfmon and Hpcrun give inconsistent results.

[stephane e. <er...@go...>]

Phil,

On Fri, Apr 18, 2008 at 9:49 AM, Philip Mucci <mu...@cs...> wrote:
> Gary,
>
>  I'm CC'ing this to the HPCTOOLKIT folks to see if they have an idea.
>  My guess is that there is some interaction with monitoring around the
>  forks/execs. Mark Krentel from Rice raised this issue a few times and
>  as far as I know, it remains unfixed. This is the old perfmon
>  interface as far as I can tell.
>
>  I'm no longer confident that this is not a monitoring/masking issue
>  nor is it a threading/signaling issue, it could be related to PAPI
>  while profiling, not functioning properly across a fork/exec. Either
>  way, you wouldn't see anything in the kernel logs. Is there any way we
>  can make code.exe run without calling doing the fork/exec's just to
>  see if it proceeds normally?
>
Keep in mind that by default pfmon DOES NOT follow across fork.

>  Another question, is there a way to trick pfmon into dumping out the
>  sample counts for individual processes? That would make it a heck of a
>  lot easier to compare.
>
It depends on which version you are using. You may want to ugrade to
CVS. The new version does print total samples+ number of buffer overflow.