Re: Interpreting Shark Results
Re: Interpreting Shark Results
- Subject: Re: Interpreting Shark Results
- From: Ansgar Esztermann <email@hidden>
- Date: Wed, 19 Aug 2009 14:21:51 +0200
On Aug 18, 2009, at 17:53 , Wade Tregaskis wrote:
That profiling method, PMI, is not precise on Intel; by the time the
interrupts are actually handled and Shark can record the state of
the machine, a few extra instructions have likely slipped by. Out
of order execution also fuzzes things substantially. Luckily cache
misses tend to stall the core, so the results are relatively
accurate. I'd hazard a guess that the misses were caused by the
movups.
Thanks a lot! So Shark is no magic wand either...
P.S. A more appropriate list for questions like this would be email@hidden
Good to know -- I'll subscribe to that list.
A.
--
Ansgar Esztermann
DV-Systemadministration
Max-Planck-Institut für biophysikalische Chemie, Abteilung 105
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