On 07/27/2007 07:45 PM, Daniel Hazelton wrote:
Updatedb or another process that uses the FS heavily runs on a users
256MB P3-800 (when it is idle) and the VFS caches grow, causing memory
pressure that causes other applications to be swapped to disk. In the
morning the user has to wait for the system to swap those applications
back in.
Questions about it:
Q) Does swap-prefetch help with this?
A) [From all reports I've seen (*)] Yes, it does.
No it does not. If updatedb filled memory to the point of causing swapping
(which noone is reproducing anyway) it HAS FILLED MEMORY and swap-prefetch
hasn't any memory to prefetch into -- updatedb itself doesn't use any
significant memory.
Here's swap-prefetch's author saying the same:
http://lkml.org/lkml/2007/2/9/112
| It can't help the updatedb scenario. Updatedb leaves the ram full and
| swap prefetch wants to cost as little as possible so it will never
| move anything out of ram in preference for the pages it wants to swap
| back in.
Now please finally either understand this, or tell us how we're wrong.
Rene.
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