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DateMon, 23 Dec 2002 10:13:34 +0300
FromHans Reiser <>
SubjectRe: [Benchmark] AIM9 results
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Cliff White wrote:

Andrew Morton wrote:



Andrew Morton wrote:




Hans Reiser wrote:




Andrew and Chris, are these changes in performance definitely due to VM changes (and not some difference I am not thinking of between 2.5 and 2.4 reiserfs code)?





aim9 is just doing

for (lots)
close(creat(filename))




unlink(filename); /* of course */






Oh, commercial fs vendors must really love tuning for this benchmark.... sigh....



Ya, we think the AIM stuff is getting a little old. The basic idea is fine, but many of the tests do _very little work. We (OSDL) would like to re-do AIM9+7 and make it more useful. We'd love to have some input from everyone.... For example, how big a file should we create for a real creat() test ? cliffw





Well, if you take a look at mongo.pl available at www.namesys.com we provide you with a fractal file size generation program that you might want to look at, that mongo uses during the creation portion of its benchmark.

It makes 80% of the files less than some amount (100 bytes, or 1k, or 4k, depending on how mean you want to be to ext2;-) ), then 80% of the
remaining 20% less than 10 times that amount then....
There is more than one version of the file size generation code, so make sure you got the one that works as I described above. I am looking for a formula to smooth the above behavior into some sort of gentle curve rather than sharp bands, but I haven't found it yet.
Hans

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