Le 28 sept. 2013 à 11:34, David S Hustace <da...@opennms.com> a écrit :
>
> On Sep 18, 2013, at 6:57 PM, Fabrice Bacchella <fbacche...@spamcop.net> wrote:
>
>> I kept FILE as the backend, I agree that NIO is too heavy on memory.
>
> What symptoms do you have of NIO weightiness? I've struggled with NIO, too,
> and just wonder what you are seeing. Perhaps I missed something in the
> scroll back on this thread, sorry.
I think the problems is in the read ahead policy on linux, that load page in
chunk of mega bytes, just for a simple update of a few bytes. When you have a
lot of rrd collected, it files the memory in a blink and you get too much swap
in/swap out for real data. Switching from NIO to FILE decreased dramaticaly my
IO load.
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