From: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
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To: | Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Use sync commit for logical replication apply in TAP tests |
Date: | 2017-04-20 15:25:58 |
Message-ID: | f1ed175e-6252-d94c-0eef-212089480766@2ndquadrant.com |
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Lists: | pgsql-hackers |
On 4/20/17 09:46, Petr Jelinek wrote:
> On 20/04/17 14:57, Peter Eisentraut wrote:
>> On 4/18/17 22:25, Petr Jelinek wrote:
>>> The commit 887227a1c changed the defaults for subscriptions to do async
>>> commit. But since the tests often wait for disk flush and there is no
>>> concurrent activity this has increased the amount of time needed for
>>> each test. So the attached patch changes the subscriptions create in tab
>>> tests to use sync commit which improves performance there (because we
>>> also replicate only very few transactions in the tests).
>>
>> I see only a 1.5% (1s/70s) improvement in the run time of the whole test
>> suite from this. Is that what you were expecting?
>
> Hmm, on my machine the difference is around 50% (~1m vs ~2m).
Double hmm, I ran a few more tests and different machines and get
consistent but underwhelming improvements.
I don't mind applying the patch nonetheless, but maybe we can get a few
more test results from others.
(Instructions: apply the patch and time make -C src/test/subscription check)
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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