Hi, On Thu, Jul 2, 2009 at 12:06 AM, Tanima Dey<dey_tr...@yahoo.com> wrote: > Hi, > Thanks for the reply. > To get the version of the perfmon tool, I used pfm_get_version() and got the > following information: > > version: 196616 > PFMLIB_MAJ_VERSION=3 > PFMLIB_MIN_VERSION= 8 > > The kernel version is: Linux 2.6.25 > > Actually I can read the counters normally and now am trying to read those in > a thread using pthreads. I found one document that mentions that the context > should be attached to a thread and that thread must be pinned to a > particular core. I am trying to that, but it is showing me the same error > message as follows: > You have two modes of operations: - per-thread: you measure only one thread, monitoring follows the threads when it migrates to different cores - system-wide: monitoring only one CPU at a time, all threads running on that CPU are monitored
In per-thread mode, the thread must be stopped (via ptrace) when you want to attach to it or read the counts. This is an implementation restriction. > pfm_load_context error errno 1 > pfm_start error errno 22 > pfm_stop error errno 22 > You should take a look at the examples_v2.x in the libpfm source tree. It shows you how to attach to a thread. > I have also tried the pfm_strerr() function to know the error name, but it > shows the following message. pfm_strerror() reports errors generated by libpfm not the kernel perfmon API, for that use regular strerror(). ------------------------------------------------------------------------------ _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
