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Re: gprof call counts wrong in multithreaded program

From: Nick Clifton
Subject: Re: gprof call counts wrong in multithreaded program
Date: Tue, 08 Jun 2010 11:40:42 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4

Hi Kalle,

It is an improvement, but I think it would be even better to
specifically mention glibc.

Ok - I have checked in a patch to change the paragraph to read as follows:

  By contrast, the number-of-calls and basic-block figures
  are derived by counting, not sampling.  They are completely
  accurate and will not vary from run to run if your program
  is deterministic and single threaded.  In multi-threaded
  applications, or single threaded applications that link
  with multi-threaded libraries, the counts are only
  deterministic if the counting function is thread-safe.
  (Note: beware that the mcount counting function in glibc
  is not thread-safe).


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