| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Robert Pang <robertpang(at)google(dot)com> |
| Cc: | 陈宗志 <baotiao(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: AIO v2.0 |
| Date: | 2024-09-16 17:56:09 |
| Message-ID: | 5izjdmmi5bvr5p7v5djoaqtykbyllf3nolt5npuvcd45pj2mds@cz3timgxtbpu |
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| Lists: | pgsql-hackers |
Hi,
On 2024-09-12 14:55:49 -0700, Robert Pang wrote:
> Hi Andres
>
> Thanks for the AIO patch update. I gave it a try and ran into a FATAL
> in bgwriter when executing a benchmark.
>
> 2024-09-12 01:38:00.851 PDT [2780939] PANIC: no more bbs
> 2024-09-12 01:38:00.854 PDT [2780473] LOG: background writer process
> (PID 2780939) was terminated by signal 6: Aborted
> 2024-09-12 01:38:00.854 PDT [2780473] LOG: terminating any other
> active server processes
>
> I debugged a bit and found that BgBufferSync() is not capping the
> batch size under io_bounce_buffers like BufferSync() for checkpoint.
> Here is a small patch to fix it.
Good catch, thanks!
I am hoping (as described in my email to Noah a few minutes ago) that we can
get away from needing bounce buffers. They are a quite expensive solution to a
problem we made for ourselves...
Greetings,
Andres Freund
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