Re: undocumented cost centres with -hd and -hy

On Wednesday 10 March 2010 04:08:19 pm Thomas Schilling wrote:

PAP stands for partial application, i.e., a function with one or more missing arguments. MUT_ARR_PTRS_FROZEN are mutable objects which are not moved by the garbage collector. They are an implementation detail of IORefs and mutable arrays (ST(U)Array, IO(U)Array, ...). Before entering a suspended computation (a THUNK), GHC overwrites it with a BLACKHOLE, to avoid space leaks and to detect cyclic dependencies.

HTH

Yes, that does help, thanks.

On 10 March 2010 13:30, Soenke Hahn wrote:

...

When using the heap profiling options -hd (profiling by closure description) and -hy (profiling by type) there are some compiler-generated cost centres, for example "PAP", "MUT_ARR_PTRS_FROZEN" and "BLACKHOLE". I wasn't able to find documentation on them. Is there any?

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