From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 17 Aug 2005 16:58:49 -0700 (PDT) From: Christoph Lameter Subject: Re: pagefault scalability patches In-Reply-To: <17155.52686.309135.906824@wombat.chubb.wattle.id.au> Message-ID: References: <20050817151723.48c948c7.akpm@osdl.org> <20050817163030.15e819dd.akpm@osdl.org> <20050817164456.77e8b85e.akpm@osdl.org> <17155.52686.309135.906824@wombat.chubb.wattle.id.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Peter Chubb Cc: Andrew Morton , torvalds@osdl.org, hugh@veritas.com, piggin@cyberone.com.au, linux-mm@kvack.org List-ID: On Thu, 18 Aug 2005, Peter Chubb wrote: > >>>>> "Andrew" == Andrew Morton 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org