On 27/09/2009 19:10, Jason Dagit wrote:
On Fri, Sep 25, 2009 at 4:34 AM, Simon Marlow <marlo...@gmail.com
<mailto: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.
If you could collect all the information you have and put it in a ticket
here: http://hackage.haskell.org/trac/ghc/newticket?type=bug that would
be great. Retainer profiling is an old and crufty piece of code
originally written by an intern, so it does break from time to time.
Cheers,
Simon
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