On Fri, 27 Jul 2007, Rene Herman wrote:
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.
however there are other programs which are known to take up significant
amounts of memory and will cause the issue being described (openoffice for
example)
please don't get hung up on the text 'updatedb' and accept that there are
programs that do run intermittently and do use a significant amount of ram
and then free it.
David Lang
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.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
