Messages in this thread | | | Date | Tue, 8 Feb 2005 12:06:14 -0500 | From | jon ross <> | Subject | VM disk cache behavior. |
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I have an app with a small fixed memory footprint that does a lot of random reads from a large file. I thought if I added more memory to the machine the VM would do more caching of the disk, but added memory does not seem to make any difference. I played with some of the params in /proc/sys/vm and none of them seem to have any effect.
I tired both a 2.4.20 & 2.6.10 kernels with no difference.
The machine is a Dell 2560. I tired memory configs of 512M, 1G, 4G and the average read-times do not change.
Do I need to set/compile anything to allow the VM to use the memory? If is was a way to tell how much memory the VM is using for a drive cache I could at least tell if my kernel is miss-configured or my app sucks.
Thanks,
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