[ovirt-users] memory leak in 3.5.6 - not vdsm
Charles Kozler
charles at fixflyer.com
Fri Jan 22 21:30:58 UTC 2016
Hi Nir -
do you have a release target date for 3.5.8? Any estimate would help.
If its not VDSM, what is it exactly? Sorry, I understood from the ticket it
was something inside vdsm, was I mistaken?
CentOS 6 is the servers. 6.7 to be exact
I have done all forms of flushing that I can (page cache, inodes, dentry's,
etc) and as well moved VM's around to other nodes and nothing changes the
memory. How can I find the leak? Where is the leak? RES shows the following
of which, the totals dont add up to 20GB
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19044 qemu 20 0 8876m 4.0g 5680 S 3.6 12.9 1571:44 qemu-kvm
26143 qemu 20 0 5094m 1.1g 5624 S 9.2 3.7 6012:12 qemu-kvm
5837 root 0 -20 964m 624m 3664 S 0.0 2.0 85:22.09 glusterfs
14328 root 0 -20 635m 169m 3384 S 0.0 0.5 43:15.23 glusterfs
5134 vdsm 0 -20 4368m 111m 10m S 5.9 0.3 3710:50 vdsm
4095 root 15 -5 727m 43m 10m S 0.0 0.1 0:02.00
supervdsmServer
4.0G + 1.1G + 624M + 169 + 111M + 43M = ~7GB
This was top sorted by RES from highest to lowest
At that point I wouldnt know where else to look except slab / kernel
structures. Of which slab shows:
[compute[root at node1 ~]$ cat /proc/meminfo | grep -i slab
Slab: 2549748 kB
So roughly 2-3GB. Adding that to the other use of 7GB we have still about
10GB unaccounted for
On Fri, Jan 22, 2016 at 4:24 PM, Nir Soffer <nsoffer at redhat.com> wrote:
> On Fri, Jan 22, 2016 at 11:08 PM, Charles Kozler <charles at fixflyer.com>
> wrote:
> > Hi Nir -
> >
> > Thanks for getting back to me. Will the patch to 3.6 be backported to
> 3.5?
>
> We plan to include them in 3.5.8.
>
> > As you can tell from the images, it takes days and days for it to
> increase
> > over time. I also wasnt sure if that was the right bug because VDSM
> memory
> > shows normal from top ...
> >
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 5134 vdsm 0 -20 4368m 111m 10m S 2.0 0.3 3709:28 vdsm
>
> As you wrote, this issue is not related to vdsm.
>
> >
> > Res is only 111M. This is from node1 which is showing currently 20GB of
> 32GB
> > used with only 2 VMs running on it - 1 with 4G and another with ~1 GB of
> RAM
> > configured
> >
> > The images are from nagios and the value here is a direct correlation to
> > what you would see in the free command output. See below from an example
> of
> > node 1 and node 2
> >
> > [compute[root at node1 ~]$ free
> > total used free shared buffers cached
> > Mem: 32765316 20318156 12447160 252 30884 628948
> > -/+ buffers/cache: 19658324 13106992
> > Swap: 19247100 0 19247100
> > [compute[root at node1 ~]$ free -m
> > total used free shared buffers cached
> > Mem: 31997 19843 12153 0 30 614
> > -/+ buffers/cache: 19199 12798
> > Swap: 18795 0 18795
> >
> > And its correlated image http://i.imgur.com/PZLEgyx.png (~19GB used)
> >
> > And as a control, node 2 that I just restarted today
> >
> > [compute[root at node2 ~]$ free
> > total used free shared buffers cached
> > Mem: 32765316 1815324 30949992 212 35784 717320
> > -/+ buffers/cache: 1062220 31703096
> > Swap: 19247100 0 19247100
>
> Is this rhel/centos 6?
>
> > [compute[root at node2 ~]$ free -m
> > total used free shared buffers cached
> > Mem: 31997 1772 30225 0 34 700
> > -/+ buffers/cache: 1036 30960
> > Swap: 18795 0 18795
> >
> > And its correlated image http://i.imgur.com/8ldPVqY.png (~2GB used).
> Note
> > how 1772 in the image is exactly what is registered under 'used' in free
> > command
>
> I guess you should start looking at the processes running on these nodes.
>
> Maybe try to collect memory usage per process using ps?
>
> >
> > On Fri, Jan 22, 2016 at 3:59 PM, Nir Soffer <nsoffer at redhat.com> wrote:
> >>
> >> On Fri, Jan 22, 2016 at 9:25 PM, Charles Kozler <charles at fixflyer.com>
> >> wrote:
> >> > Here is a screenshot of my three nodes and their increased memory
> usage
> >> > over
> >> > 30 days. Note that node #2 had 1 single VM that had 4GB of RAM
> assigned
> >> > to
> >> > it. I had since shut it down and saw no memory reclamation occur.
> >> > Further, I
> >> > flushed page caches and inodes and ran 'sync'. I tried everything but
> >> > nothing brought the memory usage down. vdsm was low too (couple
> hundred
> >> > MB)
> >>
> >> Note that there is an old leak in vdsm, will be fixed in next 3.6 build:
> >> https://bugzilla.redhat.com/1269424
> >>
> >> > and there was no qemu-kvm process running so I'm at a loss
> >> >
> >> > http://imgur.com/a/aFPcK
> >> >
> >> > Please advise on what I can do to debug this. Note I have restarted
> node
> >> > 2
> >> > (which is why you see the drop) to see if it raises in memory use over
> >> > tim
> >> > even with no VM's running
> >>
> >> Not sure what is "memory" that you show in the graphs. Theoretically
> this
> >> may be
> >> normal memory usage, Linux using free memory for the buffer cache.
> >>
> >> Can you instead show the output of "free", during one day, maybe run
> once
> >> per hour?
> >>
> >> You may also like to install sysstat for collecting and monitoring
> >> resources usage.
> >>
> >> >
> >> > [compute[root at node2 log]$ rpm -qa | grep -i ovirt
> >> > libgovirt-0.3.2-1.el6.x86_64
> >> > ovirt-release35-006-1.noarch
> >> > ovirt-hosted-engine-ha-1.2.8-1.el6.noarch
> >> > ovirt-hosted-engine-setup-1.2.6.1-1.el6.noarch
> >> > ovirt-engine-sdk-python-3.5.6.0-1.el6.noarch
> >> > ovirt-host-deploy-1.3.2-1.el6.noarch
> >> >
> >> >
> >> > --
> >> >
> >> > Charles Kozler
> >> > Vice President, IT Operations
> >> >
> >> > FIX Flyer, LLC
> >> > 225 Broadway | Suite 1600 | New York, NY 10007
> >> > 1-888-349-3593
> >> > http://www.fixflyer.com
> >> >
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> >> >
> >
> >
> >
> >
> > --
> >
> > Charles Kozler
> > Vice President, IT Operations
> >
> > FIX Flyer, LLC
> > 225 Broadway | Suite 1600 | New York, NY 10007
> > 1-888-349-3593
> > http://www.fixflyer.com
> >
> > NOTICE TO RECIPIENT: THIS E-MAIL IS MEANT ONLY FOR THE INTENDED
> RECIPIENT(S)
> > OF THE TRANSMISSION, AND CONTAINS CONFIDENTIAL INFORMATION WHICH IS
> > PROPRIETARY TO FIX FLYER LLC. ANY UNAUTHORIZED USE, COPYING,
> DISTRIBUTION,
> > OR DISSEMINATION IS STRICTLY PROHIBITED. ALL RIGHTS TO THIS INFORMATION
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>
--
*Charles Kozler*
*Vice President, IT Operations*
FIX Flyer, LLC
225 Broadway | Suite 1600 | New York, NY 10007
1-888-349-3593
http://www.fixflyer.com <http://fixflyer.com>
NOTICE TO RECIPIENT: THIS E-MAIL IS MEANT ONLY FOR THE INTENDED
RECIPIENT(S) OF THE TRANSMISSION, AND CONTAINS CONFIDENTIAL INFORMATION
WHICH IS PROPRIETARY TO FIX FLYER LLC. ANY UNAUTHORIZED USE, COPYING,
DISTRIBUTION, OR DISSEMINATION IS STRICTLY PROHIBITED. ALL RIGHTS TO THIS
INFORMATION IS RESERVED BY FIX FLYER LLC. IF YOU ARE NOT THE INTENDED
RECIPIENT, PLEASE CONTACT THE SENDER BY REPLY E-MAIL AND PLEASE DELETE THIS
E-MAIL FROM YOUR SYSTEM AND DESTROY ANY COPIES.
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