[Gluster-devel] [Gluster-users] Memory leak in GlusterFS FUSE client

[Oleksandr Natalenko]

I've applied client_cbk_cache_invalidation leak patch, and here are the 
results.

Launch:

===
valgrind --leak-check=full --show-leak-kinds=all 
--log-file="valgrind_fuse.log" /usr/bin/glusterfs -N 
--volfile-server=server.example.com --volfile-id=somevolume 
/mnt/somevolume
find /mnt/somevolume -type d
===

During the traversing, memory RSS value for glusterfs process went from 
79M to 644M. Then I performed dropping VFS cache (as I did in previous 
tests), but RSS value was not affected. Then I did statedump:

https://gist.github.com/11c7b11fc99ab123e6e2

Then I unmounted the volume and got Valgrind log:

https://gist.github.com/99d2e3c5cb4ed50b091c

Leaks reported by Valgrind do not conform by their size to overall 
runtime memory consumption, so I believe with the latest patch some 
cleanup is being performed better on exit (unmount), but in runtime 
there are still some issues.

13.01.2016 12:56, Soumya Koduri написав:
> On 01/13/2016 04:08 PM, Soumya Koduri wrote:
>> 
>> 
>> On 01/12/2016 12:46 PM, Oleksandr Natalenko wrote:
>>> Just in case, here is Valgrind output on FUSE client with 3.7.6 +
>>> API-related patches we discussed before:
>>> 
>>> https://gist.github.com/cd6605ca19734c1496a4
>>> 
>> 
>> Thanks for sharing the results. I made changes to fix one leak 
>> reported
>> there wrt ' client_cbk_cache_invalidation' -
>>      - http://review.gluster.org/#/c/13232/
>> 
>> The other inode* related memory reported as lost is mainly (maybe)
>> because fuse client process doesn't cleanup its memory (doesn't use
>> fini()) while exiting the process.  Hence majority of those 
>> allocations
>> are listed as lost. But most of the inodes should have got purged when
>> we drop vfs cache. Did you do drop vfs cache before exiting the 
>> process?
>> 
>> I shall add some log statements and check that part
> 
> Also please take statedump of the fuse mount process (after dropping
> vfs cache) when you see high memory usage by issuing the following
> command -
> 	'kill -USR1 <pid-of-gluster-process>'
> 
> The statedump will be copied to 'glusterdump.<pid>.dump.tim
> estamp` file in /var/run/gluster or /usr/local/var/run/gluster.
> Please refer to [1] for more information.
> 
> Thanks,
> Soumya
> [1] http://review.gluster.org/#/c/8288/1/doc/debugging/statedump.md
> 
>> 
>> Thanks,
>> Soumya
>> 
>>> 12.01.2016 08:24, Soumya Koduri написав:
>>>> For fuse client, I tried vfs drop_caches as suggested by Vijay in an
>>>> earlier mail. Though all the inodes get purged, I still doesn't see
>>>> much difference in the memory footprint drop. Need to investigate 
>>>> what
>>>> else is consuming so much memory here.
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