I would like to get some idea about 'database_engine_option_pool_size' and 
'database_engine_option_max_overflow'  settings. We seem to hit both of these 
limits whenever a user runs a large workflow with following error: 

TimeoutError: QueuePool limit of size 40 overflow 50 reached, connection timed 
out, timeout 30

These limits are not reached for regular (non-workflow) galaxy jobs. Any help 
on optimum values for these settings or performance tuning for workflow runs 
would be appreciated. 

Version Info: CentOS 5.7, PostgreSQL 8.4.9, Python 2.6.6, Galaxy revision 

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