Dan, to verify if the kernel got some interrupt:
- make sure you have CONFIG_DEBUG_FS enabled in your kernel - select a CPU, let's say CPU0 - run pfdbg --reset as root (pfdbg is part of pfmon/tests/) - run your test program pinned: taskset -c 0 my_test - mount the debugfs filesystem: mount -t debugfs none /debugfs - cat /debugfs/perfmon/cpu0/ovf_intr_all, it should not be zero if you think you should have gotten an interrupt On Thu, Jun 12, 2008 at 9:40 PM, Dan Terpstra <[EMAIL PROTECTED]> wrote: > Hi - > In preliminary testing of PAPI on perfmon2/Cell, it appears that the CYCLES > event produced by pfm_get_cycle_event() is not virtualized beyond 32 bits. > One of the basic PAPI tests shows this quite clearly: > > [EMAIL PROTECTED] src]$ ctests/first > Test case 1: Non-overlapping start, stop, read. > ----------------------------------------------- > Default domain is: 1 (PAPI_DOM_USER) > Default granularity is: 1 (PAPI_GRN_THR) > Using 20000000 iterations of c += a*b > ------------------------------------------------------------------------- > Test type : 1 2 3 4 5 > PAPI_TOT_INS: 220000254 220000234 440001418 660002608 660002608 > PAPI_TOT_CYC: 1457689764 1457304922 2914621474 76980116 76980116 > ------------------------------------------------------------------------- > Verification: > % difference between PAPI_TOT_INS: 1 & 2: 100.00 > % difference between PAPI_TOT_CYC 1 & 2: 100.03 > Column 1 approximately equals column 2 > Column 3 approximately equals 2 * column 2 > Column 4 approximately equals 3 * column 2 > Column 4 exactly equals column 5 > first.c FAILED > > The PAPI_TOT_CYC result in column 4 should be 3*column 2. > Instead, it is roughly 3*column 2 - 2^^32: > 3*col2 = 4371914766 > 2^^32 = 4294967296 > ---------- > 76947470 > > Is this (not) happening in the kernel or in the libpfm layer? > Does the same apply to other events as well? > > - d > > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > perfmon2-devel mailing list > perfmon2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/perfmon2-devel > ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
