> Another question: The profiling mode of GHC-4.08.2 did also output (in
> mode +RTS -p) the time spent on garbage collection (as an additional
> percentage of overall running time).
> With the programs I tested so far under GHC-5.04.1, I never
> saw such an
> indication in a.out.prof, although for the same programs under
> GHC-4.08.2 considerable garbage collection times were measured.
>
> Does this mean that:
>
> a) the indication of garbage collection times has been dropped from
> profiling reports (can I obtain them in another way?),
>
> or
>
> b) the newer GHC is so smart that it optimised away the need for
> garbage collection in the particular (few) programs I tested, but
> otherwise the GC times will show up in profiling reports,
>
> or
>
> c) something else?
The inclusion of GC time in the report was wrong, since GC time wasn't
included in the figure for total time, so you could get GC times of >
100%. You can get a measure of GC time vs. mutator time by adding '+RTS
-sstderr' to the command line.
Cheers,
Simon
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