From: Christoph Lameter <clameter@engr.sgi.com>
To: Peter Chubb <peterc@gelato.unsw.edu.au>
Cc: Andrew Morton <akpm@osdl.org>,
torvalds@osdl.org, hugh@veritas.com, piggin@cyberone.com.au,
linux-mm@kvack.org
Subject: Re: pagefault scalability patches
Date: Wed, 17 Aug 2005 16:58:49 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.62.0508171656080.19528@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <17155.52686.309135.906824@wombat.chubb.wattle.id.au>
On Thu, 18 Aug 2005, Peter Chubb wrote:
> >>>>> "Andrew" == Andrew Morton <akpm@osdl.org> writes:
>
> Andrew> The decreases in system CPU time for the single-threaded case
> Andrew> are extraordinarily high.
>
> Are the sizes of the test the same? The unpatched version says 16G,
> the patched one 4G --- with a quarter the memory size I'd expect less
> than a quarter of the overhead...
Yup I screwed up.
Patched:
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
16 3 1 0.859s 64.994s 65.084s 47768.542 47771.664
16 3 2 0.682s 63.165s 33.097s 49269.255 92591.334
16 3 4 0.632s 52.805s 17.061s 58866.320 178579.491
16 3 8 0.683s 44.233s 8.074s 70034.218 359660.206
16 3 16 0.666s 82.785s 8.052s 37694.972 368802.163
16 3 32 1.301s 172.066s 8.085s 18144.775 355252.190
16 3 64 4.958s 364.566s 9.054s 8512.883 329495.174
16 3 128 20.006s 860.666s 11.000s 3571.958 285801.678
16 3 256 12.773s 546.095s 6.071s 5628.745 468417.083
16 3 512 14.547s 253.782s 3.053s 11723.346 889858.164
Tool used to measure this is at
http://marc.theaimsgroup.com/?l=linux-kernel&m=109257807215046&w=2
The code for the test program follows the patch.
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next prev parent reply other threads:[~2005-08-17 23:58 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-17 22:17 Andrew Morton
2005-08-17 22:19 ` Christoph Lameter
2005-08-17 22:36 ` Linus Torvalds
2005-08-17 22:51 ` Christoph Lameter
2005-08-17 23:01 ` Linus Torvalds
2005-08-17 23:12 ` Christoph Lameter
2005-08-17 23:23 ` Linus Torvalds
2005-08-17 23:31 ` Christoph Lameter
2005-08-17 23:30 ` Andrew Morton
2005-08-17 23:33 ` Christoph Lameter
2005-08-17 23:44 ` Andrew Morton
2005-08-17 23:52 ` Peter Chubb
2005-08-17 23:58 ` Christoph Lameter [this message]
2005-08-18 0:47 ` Andrew Morton
2005-08-18 16:09 ` Christoph Lameter
2005-08-22 2:13 ` Benjamin Herrenschmidt
2005-08-18 0:43 ` Andrew Morton
2005-08-18 16:04 ` Christoph Lameter
2005-08-18 20:16 ` Hugh Dickins
2005-08-19 1:22 ` [PATCH] use mm_counter macros for nr_pte since its also under ptl Christoph Lameter
2005-08-19 3:17 ` Andrew Morton
2005-08-19 3:51 ` Christoph Lameter
2005-08-19 1:33 ` pagefault scalability patches Christoph Lameter
2005-08-19 3:53 ` [RFC] Concept for delayed counter updates in mm_struct Christoph Lameter
2005-08-19 4:29 ` Andrew Morton
2005-08-19 4:34 ` Andi Kleen
2005-08-19 4:49 ` Linus Torvalds
2005-08-19 16:06 ` Christoph Lameter
2005-08-20 7:33 ` [PATCH] mm_struct counter deltas in task_struct Christoph Lameter
2005-08-20 7:35 ` [PATCH] Use deltas to replace atomic inc Christoph Lameter
2005-08-20 7:58 ` Andrew Morton
2005-08-22 3:32 ` Christoph Lameter
2005-08-22 3:48 ` Linus Torvalds
2005-08-22 4:06 ` Christoph Lameter
2005-08-22 4:18 ` Linus Torvalds
2005-08-22 13:23 ` Christoph Lameter
2005-08-22 14:22 ` Hugh Dickins
2005-08-22 15:24 ` Christoph Lameter
2005-08-22 15:43 ` Andi Kleen
2005-08-22 16:24 ` Christoph Lameter
2005-08-22 20:30 ` [PATCH] mm_struct counter deltas V2 Christoph Lameter
2005-08-22 20:31 ` [PATCH] Use deltas to replace atomic inc V2 Christoph Lameter
2005-08-22 2:09 ` pagefault scalability patches Benjamin Herrenschmidt
2005-08-18 2:00 ` Nick Piggin
2005-08-18 8:38 ` Nick Piggin
2005-08-18 16:17 ` Christoph Lameter
2005-08-22 2:04 ` Benjamin Herrenschmidt
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