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
Date: Tue, 13 Apr 2004 00:51:11 -0700 [thread overview]
Message-ID: <20040413005111.71c7716d.akpm@osdl.org> (raw)
In-Reply-To: <1130000.1081841981@[10.10.2.4]>
"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...
next prev parent reply other threads:[~2004-04-13 7:51 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-13 7:39 Benchmarking objrmap under memory pressure Martin J. Bligh
2004-04-13 7:51 ` Andrew Morton [this message]
2004-04-13 7:55 ` Martin J. Bligh
2004-04-13 21:59 ` Andrea Arcangeli
2004-04-14 0:38 ` Martin J. Bligh
2004-04-14 16:27 ` Andrea Arcangeli
2004-04-14 16:42 ` Martin J. Bligh
2004-04-14 17:11 ` Andrea Arcangeli
2004-04-14 17:48 ` Hugh Dickins
2004-04-14 23:39 ` Andrea Arcangeli
2004-04-15 10:21 ` Hugh Dickins
2004-04-15 13:22 ` Andrea Arcangeli
2004-04-15 13:45 ` Hugh Dickins
2004-04-15 14:08 ` Andrea Arcangeli
2004-04-15 16:23 ` Bill Davidsen
2004-04-15 16:48 ` Hugh Dickins
2004-04-22 19:54 ` Bill Davidsen
2004-04-22 21:26 ` Hugh Dickins
2004-04-14 18:11 ` Bill Davidsen
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