On Tue, 2002-07-23 at 13:33, Andrea Arcangeli wrote:
> some seldom swapout is ok, the strange thing are those small
> swapins/swapouts. I also assume it's writing using write(2), not with
> map_shared+msync.
I am using ben's lahaise new AIO which effectively maps the pages in
before the i/o. Using normal I/O I don't see swapping, the cached peaks
at about .827028
>
> can you try:
>
> echo 1000 >/proc/sys/vm/vm_mapped_ratio
That file does not exist in 2.4.19rc3ac3
bash-2.05$ ls /proc/sys/vm
bdflush max_map_count min-readahead page-cluster
kswapd max-readahead overcommit_memory pagetable_cache
>
> I also wonder if you've quite some amount of mapped address space durign
> the benchmark. In such case there's no trivial way around it, the vm
> will constantly found tons of mapped address space, and it will trigger
> some swapouts, however the swapins shouldn't happen so fast in such
> case.
The AIO will pin some space, but the upper bound should be
NIO(16) * Record Size(64k) = 1 Meg
> In any case the sysctl will allow you to tune for your workload.
>
> Andrea
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This archive was generated by hypermail 2b29 : Tue Jul 23 2002 - 22:00:44 EST