Ian Collins wrote:
Hi,
I have a number of developers running a mix of Suse 10.2 and Suse 10.0.
These developers are all running a Java application called 'maven' that
runs unit tests on our code and also automatically creates installers.
This system also uses MySQL pretty heavily.
I have had a lot of complaints from the 10.2 users that their maven runs
are significantly (up to 50%) slower than the 10.0 machines. All
machines are of a similiar spec.
So in order to investigate, I installed a dual boot of 10.0 and 10.2
(x86) on a 3Ghz box with 1Gb RAM. Both installs used Reiser for the
filesystem.
Got burned by Reiser before... not going back until it's more stable.
Have you tried using XFS instead (root partition will still have
to use ext3). I've been very happy with it, and it seems to
perform well, too.
More below
I ran the maven app on both and saw 10.0 completed in 29 minutes and
10.2 completed in 61 minutes.
I then went a bit deeper and ran bonnie (disk benchtest) on both. This
showed the following,
Suse 10.0
---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek-
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (03)-
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
maven0 1*1000 40748 99.6105847 22.9 28052 7.7 28561 55.0 61974 9.9 744.9
2.2
Suse 10.2
---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek-
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (03)-
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
maven2 1*1000 30340 97.2 90815 20.1 25670 6.1 19712 74.1 66955 11.2
466.3 1.2
The times for the maven run (unit tests of application source and
product builds using maven) are, (not identical to the first run, but
withing the same magnitude),
Suse 10.0
real 27m5.559s
user 13m34.899s
sys 0m57.340s
Suse 10.2
real 73m19.454s
user 13m8.509s
sys 0m40.863s
The uname -a for suse 10.0 is linux 2.6.13-15-smp #1 SMP Tue Sep 13
14:56:15 UTC 2005 i686 i686 i386 GNU/Linux
The uname -a for suse 10.2 is linux 2.6.18.2-34-default #1 SMP Mon Nov
27 11:46:27 UTC 2006 i686 i686 i386 GNU/Linux
Can anyone shed any light or have any suggestions?
It's possible that 10.2 and 10.0 don't have the same verison of Reiser.
Please find attached the hardware information - siga.txt.bz2
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