Adam Hamsik <haaaad%gmail.com@localhost> writes: > On May,Wednesday 26 2010, at 7:42 PM, Greg Troxel wrote: > >> On a system with big enough bufcache and maxvnodes, I found stat to take >> about 4 us up to about 32 files, and then it starts to grow, reaching >> 9-10 us around 4096-8192 files, and then it remains relatively constant. >> > > How many times have you repeated this test. Maybe there was some > external influence (cron, other program etc.. ) who mixed with your > results. I ran it several times on several systems and the pattern was consistent. There is definitely a fair amount of measurement noise, but I think the basic take-away that stat over many files takes longer is accurate. It's also not surprising, as more files causes the data to no longer fit in caches. I would be curious to see results on other systems.
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