From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Greg Stark <stark(at)mit(dot)edu> |
Cc: | John Klos <john(at)ziaspace(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, port-vax(at)netbsd(dot)org, vax(at)openbsd(dot)org, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: PostgreSQL for VAX on NetBSD/OpenBSD |
Date: | 2015-08-20 14:29:35 |
Message-ID: | 18204.1440080975@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Greg Stark <stark(at)mit(dot)edu> writes:
> So I've been playing with this a bit. I have simh running on my home
> server as a Vax 3900 with NetBSD 6.1.5. My home server was mainly
> intended to be a SAN and its cpu is woefully underpowered so the
> resulting VAX is actually very very slow. So slow I wonder if there's
> a bug in the emulator but anyways.
Fun fun!
> There are some planner tests that fail with floating point exceptions
> -- that's probably a bug on our part. And I've seen at least one
> server crash (maybe two) apparently caused by one as well which I
> don't believe is expected.
That seems worth poking into.
> 3) The tests take so long to run that autovacuum kicks in and the
> tests start producing rows in inconsistent orderings. I assume that's
> a problem we've run into on the CLOBBER_CACHE animals as well?
I'd tentatively bet that it's more like planner behavioral differences
due to different floating-point roundoff.
> 4) One of the tablesample tests seems to freeze indefinitely. I
> haven't looked into why yet. That might indeed indicate that the
> spinlock code isn't working?
The tablesample tests seem like a not-very-likely first place for such a
thing to manifest. What I'm thinking is that there are places in there
where we loop till we get an expected result. Offhand I thought they were
all integer math; but if one was float and the VAX code wasn't doing what
was expected, maybe we could blame this on float discrepancies as well.
regards, tom lane
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