[Gluster-users] client side profiling

Xavi Hernandez jahernan at redhat.com
Fri Aug 21 05:34:30 UTC 2020


see the comments inline

On Fri, Aug 21, 2020 at 6:44 AM Computerisms Corporation <
bob at computerisms.ca> wrote:

> Hi List,
> I am still struggling with my setup.  One server is working reasonably
> well for serving websites, but serving sites from the 2nd server is
> still using excessive amounts of cpu; a bit of which is gluster, but
> most of which is apache.
> Gluster docs mentions client-side-profiling:
> https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Performance%20Testing/#client-side-profiling
> specifically:
> "In short, use client-side profiling for understanding "why is my
> application unresponsive"?"
> Great, I think this is what I want.  instructions are:
> *gluster volume profile your-volume start
> *setfattr -n trusted.io-stats-dump -v /tmp/io-stats-pre.txt
> /your/mountpoint
> *This will generate the specified file on the client
> Okay:
> root at moogle:/usr/src/gluster-profile-analysis-master# gluster vol
> profile webisms start
> Profile on Volume webisms is already started
> root at moogle:/usr/src/gluster-profile-analysis-master# setfattr -n
> trusted.io-stats-dump -v /tmp/stats.txt /Computerisms
> root at moogle:/usr/src/gluster-profile-analysis-master# ls /tmp/stats.txt
> ls: cannot access '/tmp/stats.txt': No such file or directory
> thought for sure I am doing something wrong, so I had a look at the
> gvp-client.sh script, and it appears I am doing the command correctly,
> there is just no output file.  Am I missing something?  or is this an
> outdated methodology that no longer works?

For security reasons, the value passed cannot represent a full path, so
this was changed to only tell the name of a file. The file itself is stored
inside /var/run/gluster.

If you look there, there should be a file like '-tmp-stats.txt' (replacing
'/' by '_') which contains the client profile.


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