Jakub Jelinek wrote:
On Fri, Apr 20, 2007 at 07:52:44PM -0400, Rik van Riel wrote:
It turns out that Nick's patch does not improve peak
performance much, but it does prevent the decline when
running with 16 threads on my quad core CPU!
We _definately_ want both patches, there's a huge benefit
in having them both.
Here are the transactions/seconds for each combination:
vanilla new glibc madv_free kernel madv_free + mmap_sem
threads
1 610 609 596 545
2 1032 1136 1196 1200
4 1070 1128 2014 2024
8 1000 1088 1665 2087
16 779 1073 1310 1999
FYI, I have uploaded a testing glibc that uses MADV_FREE and falls back
to MADV_DONTUSE if MADV_FREE is not available, to
http://people.redhat.com/jakub/glibc/2.5.90-21.1/
Hmm, I wonder how glibc malloc stacks up to tcmalloc on this test
(after the mmap_sem patch as well).
I'll try running that as well!
--
SUSE Labs, Novell Inc.
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