Re: psycopg2 hang with multithread frequent queries

On 14/09/2012 18:55, David Roid wrote:
> And there are two kind of symptons after the process running for a
> couple of minutes:
> (0. At first it seems ok, each thread does its job, the quick one with
> more logs of course)
> 1. The quick one keeps running, the other two get no chance being called
> any more
> 2. When one of the slow ones get called, the whole python process hang,
> with the postgresql process in 'idle in transaction'; note i'm very
> alert with psycopg2's all-in-transaction style, i'm very sure there is a
> commit/rollback to end the trac, the python process just stucks!
>
> I'm doing this test/investigate with freeload, so CPU/code conditions
> should not be a cause, i'm starting to suspect psycopg2 or postgresql,
> any hint?

How many connections are you using? Cursors? Do you commit or keep a
very long running transaction? Please give us some more information and
compile psycopg with debugging enabled to have the logs ready for analsys.

federico

--
Federico Di Gregorio                         federico.digregorio@dndg.it
Studio Associato Di Nunzio e Di Gregorio                  http://dndg.it
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