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perfctr and PAPIperfctr and PAPIPosted Nov 17, 2007 19:03 UTC (Sat) by anton (guest, #25547)Parent article: Memory part 7: Memory performance tools I have used Mikael Petterson's perfctr patch for many years to get performance monitoring counter results. Anyway, there are a number of tools that build on it. I mostly use perfex (comes with perfctr) and the more comfortable (but harder-to-install) papiex tools to get performance counter results for program runs. There are other tools related to the PAPI library that use perfctr on Linux. As far as I understand oprofile, the difference between perfctr and oprofile is that oprofile uses a sampling approach, whereas with perfctr you can get an almost-exact result; perfctr virtualizes the counters so you don't count events from other processes (although there is a little bit of fuzz on context switching, because the counters are not completely synchronous to execution).
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