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


From: Dan Parsons
Subject: Re: [Gluster-devel] io-cache exceeding cache-size value
Date: Tue, 24 Feb 2009 09:10:16 -0800

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 <address@hidden> 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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