On 12/8/05, Steve Harris <S.W.Harris@xxxxxxxxxxxxxxx> wrote: > On Wed, Dec 07, 2005 at 07:13:30 -0800, Noah Roberts wrote: > > Could the RT patch be interfearing with my ability to run gprof? > > AFAICT I did everything right to use it, used the -pg on compile for > > instance, but my profiles have no time at all in them: > > IIRC gprof works by sampling program activity at some interval. My > experience with realtime code is that it doesnt spend long enough doing > anything in particular to get meaningful results. Well, _my_ code is not realtime. Basically all I am doing is a benchmark of std::string vs. char*. > > I think you will get better results by using cachegrind et al and running > in freewheel mode so it doesn't get kicked off. Hmmm...never heard of those things. Will have to google them later. > > Failing that you can write your own profiling code reasonably easily, just > use gettimeofday before and after ciritcal sections, and sum the results > from each run. Yeah, eventually I did that but it isn't nearly as accurate as a profile. Would certainly like to know how to make gprof work and why it isn't at any rate for future development. I don't often find the need to profile, but sometimes I do and not being able to is a big bummer.
