[Gluster-devel] io-cache exceeding cache-size value

[Dan Parsons]

I've never had any bloat problems with gluster except with io-cache. Right
now, I have one node where the glusterfs process is taking 6.2GB RAM! with
cache-size set to 3000mb. It's taking so much RAM that it's actually
starting to cache stuff... into swap.
 3888     1 root        0 52.5 6.2g 7790m 1.5g 1056 8274  20   0 -         S
6  12:07 glusterfs

Crazy. As soon as the guy I need to speak to to set up some test jobs comes
in today, I'm going to follow the directions posted previously to figure out
if its a leak or something else.

Dan


On Tue, Feb 24, 2009 at 8:58 AM, Gordan Bobic <gordan at bobich.net> wrote:

> Dan Parsons wrote:
>
>> I will do this today. I noticed that I already have vm.drop_caches set to
>> 3 via sysctl.conf, based on a suggestion from you from long ago. Should I
>> delete this under normal usage? Is it possible that this setting, enabled by
>> default, is causing my problems?
>>
>
> It isn't a permanent setting, it's just a real-time instruction to drop all
> current caches.
>
> In the current context, I think the whole idea is bogus anyway because
> glusterfs process still maintains it's current resident size at hundreds of
> MB when I flush the caches (with no performance translators), so I don't
> think this affects the leak in any way.
>
> On my setup I have / mounted on glusterfs, /tmp on ext3 and /usr/src on
> NFS, so the fact that glusterfs root daemon bloating can only be caused
> either by access to shared libraries or invocation of executables, since
> compiling a big code tree (including when it doesn't reside on glusterfs)
> seems to trigger the leak in a pretty major way.
>
> I'll try to re-create the problem with a chroot environment, since debuging
> the rootfs daemon is extremely difficult.
>
>
> Gordan
>
>
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