From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Andres Freund <andres(at)anarazel(dot)de>, Rafia Sabih <rafia(dot)sabih(at)enterprisedb(dot)com>, PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: [POC] Faster processing at Gather node |
Date: | 2017-10-23 12:50:34 |
Message-ID: | CAA4eK1+YAEoWOaPoGJS=PCAdtFoCXTHxO37kazpX89sCugBYTQ@mail.gmail.com |
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Lists: | pgsql-hackers |
On Thu, Oct 19, 2017 at 1:16 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Tue, Oct 17, 2017 at 5:39 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
>
>> b) Use shm_mq_sendv in tqueue.c by batching up insertions into the
>> queue whenever it's not empty when a tuple is ready.
>
> Batching them with what? I hate to postpone sending tuples we've got;
> that sounds nice in the case where we're sending tons of tuples at
> high speed, but there might be other cases where it makes the leader
> wait.
>
I think Rafia's latest patch on the thread [1] has done something
similar where the tuples are sent till there is a space in shared
memory queue and then turn to batching the tuples using local queues.
--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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