These are the latest nrs concerning the space behaviour of my application. Some seem very weird to me. I tested the binaries on to different hosts. host1: Pentium4 2,33 Ghz, 512 mb, 1 gig swap. (linux) GHC version 6.2.1 | top shows VIRT/RSS/TIME | hc graph shows ---------------------------------------------------------------------- non-profiling bin (RTS -c) | 144mb / 144mb / 1:39 | n.a. non-profiling bin | 161mb / 161mb / 1:32 | n.a. profiling bin (RTS -hc -c) | 188mb / 188mb / 13:59 | 90 mb profiling bin (RTS -hc) | 295mb / 295mb / 19:05 | 90 mb host2: Pentium4 2,00 Ghz, 512 mb, 1 gig swap. (linux) GHC version 6.4 | top shows VIRT/RSS/TIME | hc graph shows ---------------------------------------------------------------------- non-profiling bin (RTS -c) | 148mb / 144mb / 2:12 | n.a. non-profiling bin | 165mb / 161mb / 1:60 | n.a. profiling bin (RTS -hc -c) | 621mb / 420mb / 22:06 | 90 mb profiling bin (RTS -hc) | 300mb / 295mb / 17:11 | 90 mb another funny fact is that the profiling bin (RTS -hc -c) could not finish on my host (Athlon XP 2200, 512mb, 1gig swap. (debian) GHC version 6.4) because i ran out of 1 gig of virtual memory and was using 450mb real mem at that moment. First thing to notice is that in all cases the heap graph was the same (ignoring time axis). What struck me as surprising was the enormeous difference in memory consumption between 2 hosts (that have almost similar hardware, but different GHC version). This raises some questions i can't answer... 1) Can this different be explained by the version difference of GHC !? 2) How can it be that my own host consumes a ridiculous amount of memory in comparison to host1; i couldn't even finish the run because i ran out of 1gig of swap and 512mb memory, while host1 finished the job consuming 188mb (both VIRT and RSS) in 13:59. Even IF the difference can be explained by the version of GHC. Even the difference with host2 (that also has GHC 6.4) is still big. Niels. PS ofcourse the binaries were the same everywhere, so was the test file, etc.