Date: Sat, 19 Feb 2005 13:33:47 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: threads@FreeBSD.org Subject: libpthread vs libthread, simply mysql benchmark (fwd) Message-ID: <Pine.NEB.3.96L.1050219133332.67347W-100000@fledge.watson.org>
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FYI.
Robert N M Watson
---------- Forwarded message ----------
Date: Sat, 19 Feb 2005 13:16:06 +0000 (GMT)
From: Robert Watson <rwatson@FreeBSD.org>
To: performance@FreeBSD.org
Subject: libpthread vs libthread, simply mysql benchmark
In case it's of interest -- I occasionally run MySQL "supersmack"
benchmarks at work on a dual Xeon box there. I ran the select benchmark
on the box a few minutes ago, comparing libpthread and David Xu's new
libthread on the box, and the results are pleasing:
x 6-SMP-HTT-libpthread
+ 6-SMP-HTT-libthread
+--------------------------------------------------------------------------+
| x + |
| x ++ |
| xxx +++ |
|xxxxx +++ +|
| |MA| |A| |
+--------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 10 8300.25 8442.54 8379.03 8381.652 39.682672
+ 10 10510.35 10646.98 10547.59 10551.599 39.893907
Difference at 95.0% confidence
2169.95 +/- 37.385
25.8893% +/- 0.446034%
(Student's t, pooled s = 39.7884)
In other words, a clear (and healthy) 26% performance improvement on this
simple benchmark. I don't currently have other numbers to compare
against, such as linuxthreads, etc.
This is a 2.4GHz box with 1gb of memory running MySQL 4.0.23a. Typically,
I get better performance without hyper-threading turned on, but I can't
get into the BIOS of the box remotely so couldn't turn it off properly. I
used the latest 6.x SMP kernel combined with the libthread drop from
David's perforce branch. You can find a URL to his more recent code drops
in the recent threads on freebsd-threads.
FYI, here's a brief history of HTT performance over the past year as 5.x
and 6.x matured:
Version Transactions/sec
20040515-UP-4BSD 4862
20040515-SMP-4BSD 4620
20040515-SMP-ADMTX-4BSD 4846
20040615-UP-4BSD 4899
20040616-SMP-4BSD 4941
20040616-SMP-ADMTX-4BSD 4979
20040616-netperf-UP-giant-4BSD 4907
20040616-netperf-UP-mpsafe-4BSD 4939
20040616-netperf-SMP-giant-4BSD 4587
20040616-netperf-SMP-mpsafe-4BSD 4609
20040616-netperf-SMP-ADMTX-giant-4BSD 4662
20040616-netperf-SMP-ADMTX-mpsafe-4BSD 6425
20040713-netperf-SMP-ADMTX-mpsafe-4BSD 7063
20040717-netperf-SMP-ADMTX-mpsafe-4BSD 7118
As of today, I get about 8400tps with HTT turned on, probably a bit
betterwith it turned off. By combining various factors we've introduced
in the last couple of years, such as MPSAFE network stack, scheduling
improvements, threading improvements, mutex changes, etc, we've improved
performance on mysql by over 100% on SMP, going from quite sub-par
performance in the depths of 5.x development (when all the infrastructure
changes were going in but no optimizations) to quite healthy in 6.x,
especially with the new threading library.
Robert N M Watson
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