On Sun, Mar 11, 2012 at 6:59 PM, Dave Airlie <airl...@gmail.com> wrote: > (resend to include list, I only sent it to Jose by accident). > > On Fri, Mar 9, 2012 at 8:22 PM, José Fonseca <jose.r.fons...@gmail.com> wrote: >> There are several new features in apitrace that deserve an announcement: > > I had an idea for a "feature" the other day but no idea how sane or > useful it would actually be. > > I thought about trying to integrate callgrind and apitrace somehow, so > we could instrument the CPU usage for a single frame of an > application. > > I think we'd have to run the app under callgrind with instrumentation > disabled (still slow) then enable it for the single frame. > > Just wondering if anyone else thinks its a good idea or know how to > implement it.
IIUC, you're looking for the ability to profile the app (and not the GL implementation), for a particular frame, is that right? There is definitely interest in more profiling on apitrace: - there have been some patches for GPU/CPU profiling while tracing (see timing-trace branch) but I believe it is more useful to profile while retracing - there have been some patches for GPU profiling while retracing (timing-retrace branch) but needs some good cleanup - Ryan Gordon commited patches for CPU profiling while retracing (commited, glretrace -p option) Concerning callgrind integration, I personally don't have much trust in callgrind as profiling tool -- it emulates a CPU instead of measuring one. It does so using JIT binary translation, which is why is so slow. Lately i've been using linux perf with good results. Either way, I don't know if there's any interface to start/stop measuring or emit some marker from within the app being profiled. A full opengl wrapper like apitrace it's not necessary -- a LD_PRELOAD library with just glXSwapBuffers is sufficient --, all that's necessary is to start/stop/reset the profiler on that call. I think the hard thing here is really start/stop profiling programmatically. Jose _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
