Re: WIP: WAL prefetch (another approach)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Stark <stark(at)mit(dot)edu>
Cc: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Stephen Frost <sfrost(at)snowman(dot)net>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, David Steele <david(at)pgmasters(dot)net>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Jakub Wartak <Jakub(dot)Wartak(at)tomtom(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WIP: WAL prefetch (another approach)
Date: 2021-12-17 04:11:17
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Greg Stark <stark(at)mit(dot)edu> writes:
> But if you're interested and can explain the tests to run I can try to
> get the tests running on this machine:

I'm not sure that machine is close enough to prove much, but by all
means give it a go if you wish. My test setup was explained in [1]:

>> To recap, the test lashup is:
>> * 2003 PowerMac G4 (1.25GHz PPC 7455, 7200 rpm spinning-rust drive)
>> * Standard debug build (--enable-debug --enable-cassert)
>> * Out-of-the-box configuration, except add wal_consistency_checking = all
>> and configure a wal-streaming standby on the same machine
>> * Repeatedly run "make installcheck-parallel", but skip the tablespace
>> test to avoid issues with the standby trying to use the same directory
>> * Delay long enough after each installcheck-parallel to let the
>> standby catch up (the run proper is ~24 min, plus 2 min for catchup)

Remember also that the code in question is not in HEAD; you'd
need to apply Munro's patches, or check out some commit from
around 2021-04-22.

regards, tom lane


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