| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru> |
| Subject: | Re: heavily contended lwlocks with long wait queues scale badly |
| Date: | 2022-10-31 23:51:14 |
| Message-ID: | 20221031235114.ftjkife57zil7ryw@awork3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2022-10-31 16:21:06 +0530, Bharath Rupireddy wrote:
> BTW, I've seen a sporadic crash (SEGV) with the patch in bg writer
> with the same set up [1], I'm not sure if it's really because of the
> patch. I'm unable to reproduce it now and unfortunately I didn't
> capture further details when it occurred.
That's likely because the prototype patch I submitted in this thread missed
updating LWLockUpdateVar().
Updated patch attached.
Greetings,
Andres Freund
| Attachment | Content-Type | Size |
|---|---|---|
| v3-0001-lwlock-fix-quadratic-behaviour-with-very-long-wai.patch | text/x-diff | 7.8 KB |
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