Re: [GHC] #13492: -p option report much less time than actual on high intensity of FFI calls application

12 May 2017

      #13492: -p option report much less time than actual on high intensity of FFI calls
application
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        Reporter:  varosi            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Profiling         |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Debugging         |  (amd64)
  information is incorrect           |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 The cost-center profiler only measures the time spent in the mutator (that
 is, actually doing Haskell evaluation). It will not report time spent in
 FFI calls. For that you will need to use your platform's native profiler.

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13492#comment:1
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