On Wed, 25 Jul 2007, Rene Herman wrote:
On 07/25/2007 10:07 AM, [email protected] wrote:
On Wed, 25 Jul 2007, Rene Herman wrote:
> Something like this?
[ ... ]
when the swap readahead is enabled does it make a significant difference
in the time to do the random access?
I don't use swap prefetch (nor -ck or -mm). If someone who has the patch
applied waits to hit enter until swap prefetch has prefetched it all back in
again, it certainly will.
Swap prefetch's potential to do larger reads back from swapspace than a
random segfaulting app could well be very significant. Reads are dwarved by
seeks. If this program does what you wanted, please use it to show us.
I haven't used swap prefetch either, the call was put out for what could
be used to test the performance, and I was suggesting a test.
if nobody else follows up on this I'll try to get some time to test it
myself in a day or two.
David Lang
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