[Haskell-cafe] Unrecognized function symbols in .prof

[Roman Cheplyaka]

* Iavor Diatchki <iavor.diatchki at gmail.com> [2011-02-07 23:45:58-0800]
> Another option would be to look at the generated core by using -ddump-simpl
> when compiling. This will generate a whole bunch of output, which you can
> redirect to a file and the search for the mysterious symbols inside.

IIRC they are generated at random each time.

> On Mon, Feb 7, 2011 at 11:12 PM, Lee Pike <leepike at gmail.com> wrote:
> 
> > Hi,
> >
> > I am profiling a Haskell program using GHC, and after executing the
> > program with +RTS -p, I get a .prof file that lists the cost centers
> > of the program.  Some of the cost centers listed are for function
> > symbols that do not exist in the given module.  For example, I have in
> > my .prof file:
> >
> > COST CENTRE              MODULE   %time %alloc
> > ==_a2MT                        Foo           19.8    0.0
> > ==_a2R8                         Foo           17.8    0.0
> > ==_a2Bg                         Bar           13.7    0.0
> >                  ....                     ....
> >
> > It appears these are generated symbols; how do I find out what those
> > function symbols correspond to?  (In this case, my assumption is that
> > these symbols refer to instances of the Eq class, but I'm not sure.)
> >
> > [I couldn't find anything about this in the GHC online documentation
> > or via Googling, but sorry if I missed it.]

-- 
Roman I. Cheplyaka :: http://ro-che.info/
Don't worry what people think, they don't do it very often.