Iavor, Thanks.

One way to test this would be to name the equality function explicitly.  For example, something like this: myEquality x y = ... instance Eq MyType where (==) = myEquality

Good idea (but a little painful!).

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.

The symbols aren't in the core of the module I'm profiling---sorry, I didn't mention that the symbols are from an imported library (compiled with -auto-all, so the library symbols are included in the .prof). Is there a convenient way to dump core when building libraries with cabal? (--ghc-options=-ddump-simpl doesn't seem to do it). Anyway, I'll resort to your option #1. Thanks, Lee

...

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.]

Thanks, Lee

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On Tuesday 08 February 2011 22:18:14, Roman Cheplyaka wrote:

* Iavor Diatchki [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.

Yes, but if you -ddump-simpl the profiling compilation, the profiling symbols should be those in the generated core, shouldn't they? Unfortunately, that won't help Lee since his mysterious symbols come from a library (unless he goes to the trouble of unpacking the library and recompiling it in his source tree to get the symbols).

...

On Mon, Feb 7, 2011 at 11:12 PM, Lee Pike 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