Thanks for the information. I'll do some tests changing the number of
threads for epoll.
Xavi
On 02/11/2015 04:20 PM, Shyam wrote:
On 02/11/2015 09:40 AM, Xavier Hernandez wrote:
Hi,
it seems that there are some failures in ec/nfs.t test on regression
tests. Doing some investigation I've found that before applying the
multi-threaded patch (commit 5e25569e) the problem does not seem to
happen.
This has in interesting history in failures, on the regression runs for
the MT epoll this (i.e ec/nfs.t) did not fail (there were others, but
not nfs.t).
The patch that allows configuration of MT epoll is where this started
failing around Feb 5th (but later passed). (see patchset 7 failures on,
http://review.gluster.org/#/c/9488/ )
I state the above, as it may help narrowing down the changes in EC
(maybe) that could have caused it.
Also in the latter commit, there was an error configuring the number of
threads so all regression runs would have run with a single epoll thread
(the MT epoll patch had this hard coded, so that would have run with 2
threads, but did not show up the issue (patch:
http://review.gluster.org/#/c/3842/)).
Again I state the above, as this should not be exposing a
race/bug/problem due to the multi threaded nature of epoll, but of
course needs investigation.
I'm not sure if this patch is the cause or it has revealed some bug in
ec or any other xlator.
I guess we can reproduce this issue? If so I would try setting
client.event-threads on master branch to 1, restarting the volume and
then running the test (as a part of the test itself maybe) to eliminate
the possibility that MT epoll is causing it.
My belief on MT epoll causing it is in doubt as the runs failed on the
http://review.gluster.org/#/c/9488/ (configuration patch), which had the
thread count as 1 due to a bug in that code.
I can try to identify it (any help will be appreciated), but it may take
some time. Would it be better to remove the test in the meantime ?
I am checking if this is reproducible on my machine, so that I can
possibly see what is going wrong.
Shyam
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