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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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