On Tuesday 28 December 2010 20:37:50, Johannes Waldmann wrote:
Hello.
When I run a program compiled with ghc-6.12.3 like this:
... +RTS -A2G -M8G -s
I get as an answer:
Heap exhausted; Current maximum heap size is 0 bytes (0 MB); use `+RTS -M<size>' to increase it.
Overflow, I'm almost sure. ghci> (8*2^30) `mod` (2^32) 0
and when I put the options
... +RTS -A2000M -M8000M -s
I get
Heap exhausted; Current maximum heap size is 4093640704 bytes (3904 MB); use `+RTS -M<size>' to increase it.
ghci> (8000*2^20) `mod` (2^32) 4093640704 Seems GHC uses Word for the allocation figures and you have a 32-bit system.
and both numbers look strange.
The behaviour of the program is also strange (instead of "heap exhausted" I'd expect it to do some smore garbage collections, which it does indeed without the -A option)