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Mac Forum / Programming / Mac Programming / March 2008gprof bug on Mac OS X?
With Mac OS X, I gcc and gprof. But the result is as follows. % cumulative self self total time seconds seconds calls ms/call ms/call name 0.0 0.00 0.00 2 0.00 0.00 __Z5func1v [33] 0.0 0.00 0.00 1 0.00 0.00 __Z5func2v [34] 0.0 0.00 0.00 1 0.00 0.00 _main [35] The time is always 0.0. With Linux/cygwin I can get some numbers other than 0.0. What's wrong with this? > With Mac OS X, I gcc and gprof. > But the result is as follows. [quoted text clipped - 8 lines] > than 0.0. > What's wrong with this? I don't know the answer to your question, but I would like to suggest an alternative. Apple's Shark profiler works well (or at least it should!) and I personally find it to be greatly superior to any other profiler I've used, although it is a sampling profiler rather than an instrumented profiler (I hope that's the right term), so it's not exactly the same thing. Shark is part of the CHUD tools which are an optional install with the developer tools, or which can be downloaded separately here: http://developer.apple.com/tools/download/  SignatureMichael Ash Rogue Amoeba Software > > With Mac OS X, I gcc and gprof. > > But the result is as follows. [quoted text clipped - 20 lines] > > http://developer.apple.com/tools/download/ Then you probably haven't tried Saturn. :) Saturn is Apple's adoption of gprof and offers much the same GUI analyses as Shark does; but since the program being profiled collects its own profiling data (in addition to the sampling), the results are both a more detailed - and a more accurate - description of the profiled application's execution. Greg >> I don't know the answer to your question, but I would like to suggest an >> alternative. Apple's Shark profiler works well (or at least it should!) [quoted text clipped - 9 lines] > > Then you probably haven't tried Saturn. :) You are remarkably perceptive! :) > Saturn is Apple's adoption of gprof and offers much the same GUI > analyses as Shark does; but since the program being profiled collects > its own profiling data (in addition to the sampling), the results are > both a more detailed - and a more accurate - description of the > profiled application's execution. I personally prefer sampling profilers, since it seems that the instrumentation would skew the results less overall. I also don't think that you can get a Shark-like view which displays the proportionate amount of time spent on each line of code or assembly instruction if you're using gprof data, although I would be happy to be wrong in this case. But whatever you prefer, more options and more cool tools are always good to have. Thanks for pointing it out. SignatureMichael Ash Rogue Amoeba Software > With Mac OS X, I gcc and gprof. > But the result is as follows. [quoted text clipped - 8 lines] > than 0.0. > What's wrong with this? You forgot to link in the appropriate runtime library. "gcrt1.o" (or something along those lines), check the gprof man page for the appropriate library. Greg >With Mac OS X, I gcc and gprof. >But the result is as follows. [quoted text clipped - 6 lines] > >The time is always 0.0. I realize that my reply is being posted several years after the original question. However, I have been having this same mac osx xcode gprof problem all day long so I thought I would post what I found on as many forums as possible (within the next 10 minutes anyway). gprof only works on the Mac if you are NOT using an Intel mac. If you are using an Intel Mac, then STOP WASTING your time trying to fix the gprof "all zero seconds" problem. Apple says that gprof does not work for the Intel Mac. Saturn is what you want to use. People may have told you to use Shark, but shark does sampling, which is not what gprof does. Saturn is much more similar to Shark. go to developer.apple.com search for Shark (this is part of Developer Performance Tools "CHUD Tools"). Find and download SaturnUserGuide.pdf (2007-10-31 Copyright 2007 Apple Inc. All Rights Reserved). You will have to use this flag: -finstrument-functions I am using that flag under "C flags" and under "linker flags" (in Target Info "Build" tab) ALSO: you have to GET RID OF the "-pg" flag that you were probably trying to use when you still thought there was hope to get gprof working. arg !! I typed Shark where I meant to type Saturn. Wow, that almost completely undermined my point.... Where I said: >> go to >> developer.apple.com >> >> search for Shark I MEANT TO SAY: >> go to >> developer.apple.com >> >> search for SATURN >>With Mac OS X, I gcc and gprof. >>But the result is as follows. [quoted text clipped - 31 lines] >ALSO: you have to GET RID OF the "-pg" flag that you were probably trying to >use when you still thought there was hope to get gprof working. OMG. I just noticed another big, idiotic typo in my original post. I was so frazzled and exhausted yesterday after struggling with the mac version of gprof I clearly could not type straight. Where I wrote: >> Saturn is much more similar to Shark. I MEANT TO SAY: >> Saturn is much more similar to gprof. |
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