Re: build farm machine using <make -j 8> mixed results

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: Peter Eisentraut <peter_e(at)gmx(dot)net>, Robert Creager <robert(at)logicalchaos(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: build farm machine using <make -j 8> mixed results
Date: 2012-09-08 20:46:43
Message-ID: 3614.1347137203@sss.pgh.pa.us
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Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> Scratch that theory, that was just a transient. If anything it looks
> like it is related to system load. When almost nothing was running on
> the machine it worked fine. When I started up a Browser and an MUA the
> problem occurred. This VM has 4 CPUs and 4Gb of memory and a load
> average around 0.4 right now. I'm a bit perplexed.

Hm ... you weren't using the -l (--max-load) option were you? That
would make system load affect gmake's scheduling. Although it's clear
when I test it that it is waiting for the bison run to finish before
launching the dependent builds, so it still seems like it must be a bug
if your copy isn't waiting for that.

regards, tom lane

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