On Fri, Sep 25, 2009 at 4:34 AM, Simon Marlow <marlo...@gmail.com> wrote:
> On 24/09/2009 04:57, Jason Dagit wrote: > >> I ran this more with normal builds and just the GC statistics. Here is >> what we see: >> unmodified darcs: >> 469 MB total memory in use (3 MB lost due to fragmentation) >> Total time 26.51s ( 29.76s elapsed) >> Productivity 85.6% of total user, 76.2% of total elapsed >> >> 469 MB total memory in use (3 MB lost due to fragmentation) >> Total time 26.59s ( 32.47s elapsed) >> Productivity 85.6% of total user, 70.1% of total elapsed >> >> 469 MB total memory in use (3 MB lost due to fragmentation) >> Total time 26.54s ( 29.95s elapsed) >> Productivity 85.5% of total user, 75.8% of total elapsed >> >> With my patch applied: >> 554 MB total memory in use (4 MB lost due to fragmentation) >> Total time 23.30s ( 31.56s elapsed) >> Productivity 83.1% of total user, 61.3% of total elapsed >> >> 554 MB total memory in use (4 MB lost due to fragmentation) >> Total time 22.85s ( 26.33s elapsed) >> Productivity 82.9% of total user, 71.9% of total elapsed >> >> 554 MB total memory in use (4 MB lost due to fragmentation) >> Total time 22.88s ( 26.38s elapsed) >> Productivity 82.8% of total user, 71.8% of total elapsed >> >> Now that the profiler is disabled the productivity with my changes is >> less, the run-time is maybe improved by 2-3 seconds, and the memory >> usage has increased by almost 100 megs. I can only assume that the >> profiling is interfering with my results a fair bit. >> > > The profile graphs in your previous message showed a residency of around > ~30M before your patch, and ~6M after your patch. Which seems like a > worthwhile saving. I presume those graphs were from a different test case? > If not, then something very strange is going on. If they are from a > different test case, then do the numbers stand up when using the > non-profiled darcs? > Simon, I just tried my test case with retainer profiling and it consistently segfaults. My GHC is 6.10.4 on OSX 10.5.8. I'll make a backup on my current source code, but I'm not sure how to make that available to you. Is there anything more info I could send you to help you figure out why it segfaults for me? I know I've done retainer profiling on this machine on darcs with this ghc in the past so I think it's related to my current build or configuration. Thanks, Jason
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