[Haskell-cafe] Creating a profiling version of FPS

Donald Bruce Stewart dons at cse.unsw.edu.au
Tue Apr 4 05:17:38 EDT 2006

With a recent snapshot of Cabal you can build a profiled version
of any library as follows (including for FPS): 

    $ ./Setup.hs configure -p

You'll then see ./Setup.hs build build the lib twice, once with and
once without profiling.

    /usr/bin/ar: creating dist/build/libHSfps-0.1.a
    /usr/bin/ar: creating dist/build/libHSfps-0.1_p.a

I'm using
    $ ghc-pkg list Cabal


>    Hi list,
>    I'm currently working on a pretty simple Haskell program to
>    manipulate memory dumps taken from an embedded environment.
>    The memory dumps are 64MB in length, so I manipulate them
>    using Don Stuart's Fast Packed String library, as it
>    supports mmapped files.
>    I'm a relative Haskell newbie, so unsurprisingly my first
>    attempt has dreadful performance (30% of time spent in GC),
>    and I want to do some profiling to find out why.
>    The difficulty is that I seem to be unable to produce a
>    profiling-enabled version of the FPS library, which means
>    that my application cannot be compiled with profiling
>    enabled. I notice that most of the GHC libraries seem to
>    come with both profiling and non-profiling versions enabled.
>    Does anyone know how I can create both profiling and
>    non-profiling version of FPS? As a matter of interest
>    (feature request), why doesn't Cabal build profiling and
>    non-profiling libraries as a matter of course, given that
>    you can't link non-profiling code with profiling-enabled
>    code?
>    Thanks in advance
>    Jeremy

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