On Thu, Aug 06, 2020 at 02:58:44PM +1200, Thomas Munro wrote:
>On Tue, Aug 4, 2020 at 3:47 AM Tomas Vondra
><tomas.vondra@2ndquadrant.com> wrote:
>> On Thu, Jul 02, 2020 at 03:09:29PM +1200, Thomas Munro wrote:
>> >FYI I am still trying to reproduce and understand the problem Tomas
>> >reported; more soon.
>>
>> Any luck trying to reproduce thigs? Should I try again and collect some
>> additional debug info?
>
>No luck. I'm working on it now, and also trying to reduce the
>overheads so that we're not doing extra work when it doesn't help.
>
OK, I'll see if I can still reproduce it.
>By the way, I also looked into recovery I/O stalls *other* than
>relation buffer cache misses, and created
>https://commitfest.postgresql.org/29/2669/ to fix what I found. If
>you avoid both kinds of stalls then crash recovery is finally CPU
>bound (to go faster after that we'll need parallel replay).
Yeah, I noticed. I'll take a look and do some testing in the next CF.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
