Date: Tue, 9 Mar 2004 17:07:09 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org
Subject: Re: [lockup] Re: objrmap-core-1 (rmap removal for file mappings to avoid 4:4 in <=16G machines)
Message-ID: <20040309160709.GA10577@elte.hu>
References: <20040308202433.GA12612@dualathlon.random> <20040309105226.GA2863@elte.hu> <20040309110233.GA3819@elte.hu> <20040309155917.GH8193@dualathlon.random>
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* Andrea Arcangeli <andrea@suse.de> wrote:

> > or run the attached test-mmap2.c code, which simulates a very small DB
> > app using only 1800 vmas per process: it only maps 8 MB of shm and
> > spawns 32 processes. This has an even more lethal effect than the
> > previous code.
> 
> this use more cpu than the previous one, but no other differences.

how fast is the system you tried this on? If it's faster than the 500
MHz box i tried it on then please try the attached test-mmap3.c. (which
is still not doing anything extreme.)

	Ingo
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