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 njn25@cam.ac.uk