From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Noah Misch <noah(at)leadboat(dot)com> |
Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Timeout control within tests |
Date: | 2022-02-18 15:26:52 |
Message-ID: | 3949563.1645198012@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Noah Misch <noah(at)leadboat(dot)com> writes:
> On Thu, Feb 17, 2022 at 09:48:25PM -0800, Andres Freund wrote:
>> Meson's test runner has the concept of a "timeout multiplier" for ways of
>> running tests. Meson's stuff is about entire tests (i.e. one tap test), so
>> doesn't apply here, but I wonder if we shouldn't do something similar?
> Hmmm. It is good if the user can express an intent that continues to make
> sense if we change the default timeout. For the buildfarm use case, a
> multiplier is moderately better on that axis (PG_TEST_TIMEOUT_MULTIPLIER=100
> beats PG_TEST_TIMEOUT_DEFAULT=18000). For the hacker use case, an absolute
> value is substantially better on that axis (PG_TEST_TIMEOUT_DEFAULT=3 beats
> PG_TEST_TIMEOUT_MULTIPLIER=.016666).
FWIW, I'm fairly sure that PGISOLATIONTIMEOUT=300 was selected after
finding that smaller values didn't work reliably in the buildfarm.
Now maybe 741d7f1 fixed that, but I wouldn't count on it. So while I
approve of the idea to remove PGISOLATIONTIMEOUT in favor of using this
centralized setting, I think that we might need to have a multiplier
there, or else we'll end up with PG_TEST_TIMEOUT_DEFAULT set to 300
across the board. Perhaps the latter is fine, but a multiplier seems a
bit more flexible.
On the other hand, I also support your point that an absolute setting
is easier to think about / adjust for special uses. So maybe we should
just KISS and use a single absolute setting until we find a hard reason
why that doesn't work well.
regards, tom lane
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