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Date: Sun, 06 May 2007 13:22:27 -0500 From: "Jory A. Pratt" <geekypenguin@...il.com> To: Con Kolivas <kernel@...ivas.org> CC: Ingo Molnar <mingo@...e.hu>, ck list <ck@....kolivas.org>, Nick Piggin <nickpiggin@...oo.com.au>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [ck] Re: swap-prefetch: 2.6.22 -mm merge plans Con Kolivas wrote: > Here's a better swap prefetch tester. Instructions in file. > > Machine with 2GB ram and 2GB swapfile > > Prefetch disabled: > ./sp_tester > Ram 2060352000 Swap 1973420000 > Total ram to be malloced: 3047062000 bytes > Starting first malloc of 1523531000 bytes > Starting 1st read of first malloc > Touching this much ram takes 809 milliseconds > Starting second malloc of 1523531000 bytes > Completed second malloc and free > Sleeping for 600 seconds > Important part - starting reread of first malloc > Completed read of first malloc > Timed portion 53397 milliseconds > > Enabled: > ./sp_tester > Ram 2060352000 Swap 1973420000 > Total ram to be malloced: 3047062000 bytes > Starting first malloc of 1523531000 bytes > Starting 1st read of first malloc > Touching this much ram takes 676 milliseconds > Starting second malloc of 1523531000 bytes > Completed second malloc and free > Sleeping for 600 seconds > Important part - starting reread of first malloc > Completed read of first malloc > Timed portion 26351 milliseconds > echo 1 > /proc/sys/vm/overcommit_memory swapoff -a swapon -a ./sp_tester Ram 1153644000 Swap 1004052000 Total ram to be malloced: 1655670000 bytes Starting first malloc of 827835000 bytes Starting 1st read of first malloc Touching this much ram takes 937 milliseconds Starting second malloc of 827835000 bytes Completed second malloc and free Sleeping for 600 seconds Important part - starting reread of first malloc Completed read of first malloc Timed portion 15011 milliseconds echo 0 > /proc/sys/vm/overcommit_memory swapoff -a swapon -a ./sp_tester Ram 1153644000 Swap 1004052000 Total ram to be malloced: 1655670000 bytes Starting first malloc of 827835000 bytes Starting 1st read of first malloc Touching this much ram takes 1125 milliseconds Starting second malloc of 827835000 bytes Completed second malloc and free Sleeping for 600 seconds Important part - starting reread of first malloc Completed read of first malloc Timed portion 14611 milliseconds - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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