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Re: Posix Shared Mem patch

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Magnus Hagander <magnus(at)hagander(dot)net>, Andres Freund <andres(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org, Thom Brown <thom(at)linux(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>
Subject: Re: Posix Shared Mem patch
Date: 2012-06-28 18:51:20
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> I tried this.  At least on my fairly vanilla MacOS X desktop, an mlock
> for a larger amount of memory than was conveniently on hand (4GB, on a
> 4GB box) neither succeeded nor failed in a timely fashion but instead
> progressively hung the machine, apparently trying to progressively
> push every available page out to swap.  After 5 minutes or so I could
> no longer move the mouse.  After about 20 minutes I gave up and hit
> the reset button.  So there's apparently no value to this as a
> diagnostic tool, at least on this platform.

Fun.  I wonder if other BSDen are as brain-dead as OSX on this point.

It'd probably at least be worth filing a bug report with Apple about it.

			regards, tom lane

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