Hi all, I'm working with a system with Xeon E5410 processors. The Linux kernel version is 2.6.27, and libpfm/pfmon v3.6 (released on 2008-10-13). The pfmon command line I used was: pfmon --smpl-outfile=xxxxx --with-header --smpl-module=compact --follow-all --reset-non-smpl-periods --overflow-block --long-smpl-periods=200000 -e unhalted_core_cycles,instructions_retired,bus_trans_brd:self,bus_trans_wb:self -- $command. The target program is 410.bwaves from the SPEC2006 set.
The problem is, I got some sampling entries which are obviously incorrect. For example, here is a fragment from the sampling output: #entry pid tid cpu ip time-stamp pmd event set smpl-period inst bus-read bus-write 107 21756 21756 7 0x8049019 0x0000e8782f906259 17 0 -200000 0x11bc3 0x8 0x8 108 21756 21756 7 0x8048e8a 0x0000e8782f95a58e 17 0 -200000 0x1184c 0xc 0xc 109 21756 21756 7 0xffffffff8024f092 0x0000e87837fa6f04 17 0 -200000 0x1c19497 0xf3c 0xf44 110 21756 21756 7 0x8049109 0x0000e87837fff107 17 0 -200000 0x111fb 0x23 0x24 Note for entry #109, the sampled number of inst_retired is 0x1c19497, which is obvious too large (if it is correct, the IPC would be 0x1c19497/200000=147). Note I used --reset-non-smpl-periods to reset the counters when sample-based-counter overflows. I run the program multiple times, and there always 5-10 weird entries through the 15-minutes' run. BTW, when using the --follow-all option, I always get the error meg "unknown ptrace event 0". I don't know if this matters. Thanks ! ----- Scott ICT,CAS ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
