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Date: Mon, 19 Nov 2012 21:37:08 +0000 From: Mel Gorman <mgorman@...e.de> To: Ingo Molnar <mingo@...nel.org> Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Paul Turner <pjt@...gle.com>, Lee Schermerhorn <Lee.Schermerhorn@...com>, Christoph Lameter <cl@...ux.com>, Rik van Riel <riel@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Andrea Arcangeli <aarcange@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, Johannes Weiner <hannes@...xchg.org>, Hugh Dickins <hughd@...gle.com> Subject: Re: [PATCH 00/27] Latest numa/core release, v16 On Mon, Nov 19, 2012 at 09:07:07PM +0100, Ingo Molnar wrote: > > * Mel Gorman <mgorman@...e.de> wrote: > > > > [ SPECjbb transactions/sec ] | > > > [ higher is better ] | > > > | > > > SPECjbb single-1x32 524k 507k | 638k +21.7% > > > ----------------------------------------------------------------------- > > > > > > > I was not able to run a full sets of tests today as I was > > distracted so all I have is a multi JVM comparison. I'll keep > > it shorter than average > > > > 3.7.0 3.7.0 > > rc5-stats-v4r2 rc5-schednuma-v16r1 > > TPut 1 101903.00 ( 0.00%) 77651.00 (-23.80%) > > TPut 2 213825.00 ( 0.00%) 160285.00 (-25.04%) > > TPut 3 307905.00 ( 0.00%) 237472.00 (-22.87%) > > TPut 4 397046.00 ( 0.00%) 302814.00 (-23.73%) > > TPut 5 477557.00 ( 0.00%) 364281.00 (-23.72%) > > TPut 6 542973.00 ( 0.00%) 420810.00 (-22.50%) > > TPut 7 540466.00 ( 0.00%) 448976.00 (-16.93%) > > TPut 8 543226.00 ( 0.00%) 463568.00 (-14.66%) > > TPut 9 513351.00 ( 0.00%) 468238.00 ( -8.79%) > > TPut 10 484126.00 ( 0.00%) 457018.00 ( -5.60%) > > These figures are IMO way too low for a 64-way system. I have a > 32-way system with midrange server CPUs and get 650k+/sec > easily. > 48-way as I said here https://lkml.org/lkml/2012/11/3/109. If I said 64-way somewhere else, it was a mistake. The lack of THP would account for some of the difference. As I was looking for potential locking-related issues, I also had CONFIG_DEBUG_VMA nd CONFIG_DEBUG_MUTEXES set which would account for more overhead. Any options set are set for all tests that make up a group. > Have you tried to analyze the root cause, what does 'perf top' > show during the run and how much idle time is there? > No, I haven't and the machine is currently occupied. However, a second profile run was run as part of the test above. The figures I reported are based on a run without profiling. With profiling, oprofile reported Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 6000 samples % image name app name symbol name 176552 42.9662 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 intel_idle 22790 5.5462 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 find_busiest_group 10533 2.5633 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 update_blocked_averages 10489 2.5526 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 rb_get_reader_page 9514 2.3154 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 native_write_msr_safe 8511 2.0713 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 ring_buffer_consume 7406 1.8023 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 idle_cpu 6549 1.5938 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 update_cfs_rq_blocked_load 6482 1.5775 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 rebalance_domains 5212 1.2684 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 run_rebalance_domains 5037 1.2258 perl perl /usr/bin/perl 4167 1.0141 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 page_fault 3885 0.9455 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 cpumask_next_and 3704 0.9014 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 find_next_bit 3498 0.8513 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 getnstimeofday 3345 0.8140 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 __update_cpu_load 3175 0.7727 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 load_balance 3018 0.7345 vmlinux-3.7.0-rc5-schednuma-v16r1 vmlinux-3.7.0-rc5-schednuma-v16r1 menu_select > Trying to reproduce your findings I have done 4x JVM tests > myself, using 4x 8-warehouse setups, with a sizing of -Xms8192m > -Xmx8192m -Xss256k, and here are the results: > > v3.7 v3.7 > SPECjbb single-1x32 524k 638k +21.7% > SPECjbb multi-4x8 633k 655k +3.4% > I'll re-run with THP enabled the next time and see what I find. > So while here we are only marginally better than the > single-instance numbers (I will try to improve that in numa/core > v17), they are still better than mainline - and they are > definitely not slower as your numbers suggest ... > > So we need to go back to the basics to figure this out: please > outline exactly which commit ID of the numa/core tree you have > booted. Also, how does 'perf top' look like on your box? > I'll find out what perf top looks like ASAP. -- Mel Gorman SUSE Labs -- 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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