Re: Improving connection scalability: GetSnapshotData()
От | Tomas Vondra |
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Тема | Re: Improving connection scalability: GetSnapshotData() |
Дата | |
Msg-id | 20200329225243.hogrvgs3jwpvrjxv@development обсуждение исходный текст |
Ответ на | Re: Improving connection scalability: GetSnapshotData() (Andres Freund <andres@anarazel.de>) |
Список | pgsql-hackers |
On Sun, Mar 29, 2020 at 11:50:10AM -0700, Andres Freund wrote: >Hi, > >On March 29, 2020 11:24:32 AM PDT, Alexander Korotkov ><a.korotkov@postgrespro.ru> wrote: >> clearly a big win on majority >>of workloads, I think we still need to investigate different workloads >>on different hardware to ensure there is no regression. > >Definitely. Which workloads are you thinking of? I can think of those >affected facets: snapshot speed, commit speed with writes, connection >establishment, prepared transaction speed. All in the small and large >connection count cases. > >I did measurements on all of those but prepared xacts, fwiw. That >definitely needs to be measured, due to the locking changes around >procarrayaddd/remove. > >I don't think regressions besides perhaps 2pc are likely - there's >nothing really getting more expensive but procarray add/remove. > If I get some instructions what tests to do, I can run a bunch of tests on my machinees (not the largest boxes, but at least something). I don't have the bandwidth to come up with tests on my own, at the moment. regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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