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What up w Pageout Number?
Authored by: petey on Feb 07, '02 02:21:39AM

I expected that the Pageout count would grow up to 80MB before the system built another Swapfile, but that hasn't been my experience so far. I seem to get new Swapfiles at 20MB increments of the Pageout count.

Any idea why this would be happening?

I'm almost 100% positive that Swapfiles are fixed at 80MB, so that means one of two things. Either:

- My Pageout calculation is wrong. I've been assuming each pageout as reported in vm_stat is 4K. Are they really 16K?

- Or, my understanding of the relationship betweeen Pageouts and Swapfiles is completely wrong.



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What up w Pageout Number?
Authored by: porkchop_d_clown on Feb 08, '02 10:40:59AM

I don't think your calculations are wrong, I just think OS X has an aggressive VM system. Adding more swap is an expensive proposition, so the authors probably decided to add the second file way ahead of time, instead of risking a crash by waiting till your really about to run out.



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