| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alexander Lakhin <exclusion(at)gmail(dot)com> |
| Cc: | Peter Eisentraut <peter(at)eisentraut(dot)org>, Euler Taveira <euler(at)eulerto(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, "kuroda(dot)hayato(at)fujitsu(dot)com" <kuroda(dot)hayato(at)fujitsu(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Michael Paquier <michael(at)paquier(dot)xyz>, Andres Freund <andres(at)anarazel(dot)de>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Fabrízio de Royes Mello <fabriziomello(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com> |
| Subject: | Re: speed up a logical replica setup |
| Date: | 2024-06-30 16:59:54 |
| Message-ID: | 2377319.1719766794@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Alexander Lakhin <exclusion(at)gmail(dot)com> writes:
> As a recent buildfarm failure [1] shows, that test addition introduced
> new instability:
I have a different but possibly-related complaint: why is
040_pg_createsubscriber.pl so miserably slow? On my machine it
runs for a bit over 19 seconds, which seems completely out of line
(for comparison, 010_pg_basebackup.pl takes 6 seconds, and the
other test scripts in this directory take much less). It looks
like most of the blame falls on this step:
[12:47:22.292](14.534s) ok 28 - run pg_createsubscriber on node S
AFAICS the amount of data being replicated is completely trivial,
so that it doesn't make any sense for this to take so long --- and
if it does, that suggests that this tool will be impossibly slow
for production use. But I suspect there is a logic flaw causing
this. Speculating wildly, perhaps that is related to the failure
Alexander spotted?
regards, tom lane
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