undocumented cost centres with -hd and -hy

Soenke Hahn shahn at cs.tu-berlin.de
Wed Mar 10 08:30:57 EST 2010

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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