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From: Craig Thomas <craiger@os...> - 2003-01-20 22:00:23
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I think the important thing to do is to make sure your cache is put into a known state before the run of each test. We found that our database runs have different results whether we reboot and run or whether we run a database test run without rebooting. For the safety of knowing the state of our entire system, we elected to use a reboot then run method. On Mon, 2003-01-20 at 13:47, Cliff White wrote: > > Rick was probably referring to the CPU caches. > > > > Right -- for scheduling purposes probably the disk caches aren't that > > important. > > > > We use a tool called "eatmem" to allocate all free memory a page at a time. > > This also has the effect of trashing the cache. > > I'll dig it up. > > > > Ok, thanks. I don't know if cold or warm cpu caches will make a difference > > either but would be interested in hearing if people have determined if > > they matter for this. > > > > Rick > > > We always reboot - that's one of the primary advantages of STP for running > tests. > However, when we do performance numbers, we always keep the run going long > enough to > warm the cache. We take numbers only from the last 20 minutes of the run, so > we know > we have a consistent cache state. > > We don't re-run on a already-warm cache, 'cause that leads to inconsistent > results. > > > cliffw > > > > > ------------------------------------------------------- > > This SF.NET email is sponsored by: FREE SSL Guide from Thawte > > are you planning your Web Server Security? Click here to get a FREE > > Thawte SSL guide and find the answers to all your SSL security issues. > > http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0026en > > _______________________________________________ > > Lse-tech mailing list > > Lse-tech@... > > https://lists.sourceforge.net/lists/listinfo/lse-tech > > > > > > > ------------------------------------------------------- > This SF.NET email is sponsored by: FREE SSL Guide from Thawte > are you planning your Web Server Security? Click here to get a FREE > Thawte SSL guide and find the answers to all your SSL security issues. > http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0026en > _______________________________________________ > Lse-tech mailing list > Lse-tech@... > https://lists.sourceforge.net/lists/listinfo/lse-tech -- Craig Thomas <craiger@...> OSDL |