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Author Topic: JFS eating CPU resources?  (Read 5199 times)
RobertM
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« Reply #15 on: 2010.04.30, 11:01:24 »

Back on the topic - in the mentioned document there's a possible explanation for this. Syncing the cache maybe your problem. I still think it's worth to play with the JFS parameters. In your case I would even suggest you to email Sjoerd.

That I saw... I am going to play with some of those figures to ensure the cache is sync'd. I'll see what that does... though I am sure there's still a lot of fragmentation. And with the sheer volume of data moving back and forth (between web outgoing, logging, mail in both directions, and the ftp server transferring gigs - of sometimes tens of thousands of small to medium sized images) I am guessing that, fragmentation aside, it's gonna have slowdowns when the cache is not sync'd.
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RobertM
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« Reply #16 on: 2010.04.30, 11:05:22 »

I'm planning on trying /MINBUFFER:8000 /MAXBUFFER:32000 which will set the values to 32MB and 128MB respectively - with a 500MB cache - on the SMP machine...

On the non-SMP machine, same buffer sizes, but smaller cache (200MB) as the running stuff (Apache, MySQL, PHP, etc) seem to eat as much as a gig and a half at times.
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