Hi,
I'm interested in determining the amount of memory used by various Glasgow
Haskell programs.
The -s runtime option produces information like this:
222,447,136 bytes allocated in the heap
30,327,124 bytes copied during GC
4,625,052 bytes maximum residency (12 sample(s))
847 collections in generation 0 ( 0.24s)
12 collections in generation 1 ( 0.19s)
10 Mb total memory in use
INIT time 0.01s ( 0.02s elapsed)
MUT time 1.28s ( 1.31s elapsed)
GC time 0.43s ( 0.45s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 1.72s ( 1.78s elapsed)
%GC time 25.0% (25.3% elapsed)
Alloc rate 172,439,640 bytes per MUT second
Productivity 74.4% of total user, 71.9% of total elapsed
Judging from the source (rts/Stats.c), the "10 Mb total memory in use"
figure here counts the number of megablocks allocated... but what does
this actually mean?
It's fairly straightforward to determine a program's maximum stack size by
fiddling with the -K runtime option and using a binary search.
Is there a similarly easy way to find a program's maximum heap size? I
don't think fiddling the -M option will work, because that affects the
execution (it can cause extra GCs).
And is there a way to measure static memory usage? And then the
maximum combination of stack+heap+static? (I guess that is the "maximum
residency" above)?
Thanks.
--
Nick Nethercote
[EMAIL PROTECTED]
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