Date: Tue, 13 Apr 2004 00:51:11 -0700
From: Andrew Morton <akpm@osdl.org>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: hugh@veritas.com, andrea@suse.de, linux-kernel@vger.kernel.org
Subject: Re: Benchmarking objrmap under memory pressure
Message-Id: <20040413005111.71c7716d.akpm@osdl.org>
In-Reply-To: <1130000.1081841981@[10.10.2.4]>
References: <1130000.1081841981@[10.10.2.4]>
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"Martin J. Bligh" <mbligh@aracnet.com> wrote:
>
> UP Athlon 2100+ with 512Mb of RAM. Rebooted clean before each test
> then did "make clean; make vmlinux; make clean". Then I timed a
> "make -j 256 vmlinux" to get some testing under mem pressure. 
> 
> I was trying to test the overhead of objrmap under memory pressure,
> but it seems it's actually distinctly negative overhead - rather pleasing
> really ;-) 
> 
> 2.6.5
> 225.18user 30.05system 6:33.72elapsed 64%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (37590major+2604444minor)pagefaults 0swaps
> 
> 2.6.5-anon_mm
> 224.53user 26.00system 5:29.08elapsed 76%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (29127major+2577211minor)pagefaults 0swaps

A four second reduction in system time caused a one minute reduction in
runtime?  Pull the other one ;)

Average of five runs, please...

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