From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: fft_665665@163.com
Subject: BUG #17441: shm_mq receive less data than the sender sends
Date: Sun, 20 Mar 2022 08:39:01 +0000
Message-ID: <17441-b67dc542f085e3ba@postgresql.org> (raw)
The following bug has been logged on the website:
Bug reference: 17441
Logged by: ytf
Email address: fft_665665@163.com
PostgreSQL version: 10.17
Operating system: centos
Description:
Dears,
I launch one dynamic worker as the sender, use shm_mq send data to the
SELECT, which I register a copy hook to receive data from sender.
Each data length is 800.
When I set shm_mq SIZE to 16, there is no problem. Only speed is very
slow.
However, when I set shm_mq Size to 8192 or larger, I meet a problem.
I first receive 800 length data , and after a few times, I only receive 732
length data.
I registered the shm_mq like following :
#define QUEUE_SIZE 8192
mq = shm_mq_create(shm_toc_allocate(pcxt->toc, QUEUE_SIZE), QUEUE_SIZE);
shm_toc_insert(pcxt->toc, COS_KEY_QUEUE, mq);
shm_mq_set_receiver(mq, MyProc);
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To: pgsql-bugs@postgresql.org
Cc: noreply@postgresql.org, pgsql-bugs@lists.postgresql.org, fft_665665@163.com
Subject: Re: BUG #17441: shm_mq receive less data than the sender sends
In-Reply-To: <17441-b67dc542f085e3ba@postgresql.org>
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