Varnishd and the disk IO

[Per Buer]

Hi

On Mon, May 14, 2012 at 9:15 AM, 姚伟斌 <nbubingo at gmail.com> wrote:

> Hello, folks,
>
> I have a question. Does the varnish often sync the shared memory file
> named "_.vsm" with the disk? I saw many disk IOs with varnish:
>

No. But Linux does sync the shmlog to disk as Linux hasn't properly
implemented the flag that keeps stuff off the disk. You can try to either
move the shmlog to a memory based filesystem or tune /proc/sys/vm/*dirty*
and friends. Modern Linux distros seem to prefer syncing stuff to disk very
aggresivly.

-- 
Per Buer,
Phone: +47 21 98 92 61 / Mobile: +47 958 39 117 / Skype: per.buer
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