Dan, I made that change recently because I learned that on NHM, not all unit masks can be combined. In fact, it seems only unit masks of events counting cycles apparently can.
But it may be that FP_COMP is an exception I missed. But something looks strange to me in your results. If you pass 2 unit masks, libpfm should return an error (pfm_dispatch_events or pfm_get_perf_event_encoding). But you say you're getting zero count, which leads me to believe, libpfm did not return an error. On Thu, Jan 14, 2010 at 11:08 PM, Dan Terpstra <terps...@eecs.utk.edu> wrote: > Stephane – > > I imported the latest sources from libpfm the other day in preparation for > the PAPI-C release. Today our regression tests showed 0 counts for > PAPI_FP_OPS. In tracing this problem we discovered that the latest > intel_corei7_events.h has a whole bunch of new PFMLIB_NHM_UMASK_NCOMBO flags > set, including on FP_COMP_OPS_EXE. I don’t know about the other instances, > but I know that UMASKS can be combined for that event. Our definition of > PAPI_FP_OPS is: > > FP_COMP_OPS_EXE:SSE_DOUBLE_PRECISION:SSE_SINGLE_PRECISION > > This produces 0 counts. > > If we clear that flag, we get the proper # of counts. > > If we use: FP_COMP_OPS_EXE:SSE_DOUBLE_PRECISION we get the right answer; > > If we use: FP_COMP_OPS_EXE:SSE_SINGLE_PRECISION we get 0. > > > > I hesitate to change just this one flag without knowing the reasoning behind > all these restrictions. But I can’t release PAPI if it doesn’t count > floating point. The other concern is that even though we passed in two > UMASKs to an event that supposedly could only handle one, we didn’t see an > error message. Is that PAPI’s fault or libpfm’s? > > > > Thanks, > > - dan > > -- Stephane Eranian | EMEA Software Engineering Google France | 38 avenue de l'Opéra | 75002 Paris Tel : +33 (0) 1 42 68 53 00 This email may be confidential or privileged. If you received this communication by mistake, please don't forward it to anyone else, please erase all copies and attachments, and please let me know that it went to the wrong person. Thanks ------------------------------------------------------------------------------ Throughout its 18-year history, RSA Conference consistently attracts the world's best and brightest in the field, creating opportunities for Conference attendees to learn about information security's most important issues through interactions with peers, luminaries and emerging and established companies. http://p.sf.net/sfu/rsaconf-dev2dev _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
