Hello Malcolm,
Friday, September 09, 2005, 2:21:51 AM, you wrote:
MW> Niels
since my application takes up way to much memory, i decided to profile it (compile d it with -prof and -auto-all). After running it with +RTS -hc, it shows a graph that reaches a peak at around 85mb. However, when i check the memory usage with 'top' i see the application reach over 300mb.
MW> If, however, you are comparing /unprofiled/ 'top' with the profile, it MW> suggests a fault in ghc's profiling code. i don't know what value shows the -xc oprion, but memory usage in ghc-compiled program are increased because by default used "copying" garbage collection algorithm. using option "+RTS -c" will significantly reduce memory usage, which will make program faster if it currently needs swapping. you can also force, for example, using of compacting algorithm when memory usage grows more than 200 mb with options "+RTS -M1G -c20". see "4.14.2. RTS options to control the garbage collector" in ghc docs for details btw, i suggested to GHC team auto-switching to compacting algorithm when program begins swapping. you can vote for this suggestion if it what you need ;) -- Best regards, Bulat mailto:bulatz@HotPOP.com