On May 20, 2013, at 9:45 AM, Nate Coraor <n...@bx.psu.edu>

> On May 19, 2013, at 11:41 PM, Fields, Christopher J wrote:
>> I've been seeing this error popping up quite a bit recently (we're using 
>> Torque 3.0.5), which is giving a general 'cluster failure' Galaxy error on 
>> jobs:
>>   galaxy.jobs.runners.pbs WARNING 2013-05-19 18:56:44,073 (10588) pbs_submit 
>> failed (try 1/5), PBS error 15033: No free connections
>> This just recently started springing up after we had been using the cluster 
>> for over a year, not sure why it would start acting up now.  This appears to 
>> be related to a bug/defect with pbs_python, which doesn't seem to have been 
>> fixed yet (I posted a query whether this has been addressed):
>>   https://oss.trac.surfsara.nl/pbs_python/ticket/29
>> Restarting helps, but are there any other recommended workarounds?  Is the 
>> only solution recompiling Torque with NCONNECTS?
> Hi Chris,
> I've always increased NCONNECTS to avoid this.  You may also want to decrease 
> the number of workers for the runners as this should decrease the number of 
> connections that Galaxy makes.
> You could also try the DRMAA runner.
> --nate

Hi Nate,

I reduced the handlers down and that seems to have taken care of it for now.  
One of the authors of pbs_python (in the error report I commented on 
(https://oss.trac.surfsara.nl/pbs_python/ticket/29#comment:5) replied:

"Which framework do you use PBSQuery? Then there will be open/close with every 
query. If you use pbs_python you have to close the connetction and open it 
again. The number of connections is handle by the pbs_server and also the time 
that a connection can be open. This has nothing to do with pbs python code, 
maybe i can improve the error codes."

Not sure how to answer that one as I don't know exactly what Galaxy is doing 

BTW, we're still using a pre-April Galaxy release, so we may test this again 
once we have updated to the latest (probably in the next month or so).  We may 
switch over to DRMAA if you find that more stable, would just need to schedule 
down time to recompile with DRMAA support and higher NCONNECTS.


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