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Open Source and information security mailing list archives
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Date: Mon, 29 Feb 2016 10:37:08 +0100
From: Ingo Molnar <mingo@...nel.org>
To: kernel test robot <ying.huang@...ux.intel.com>
Cc: Mel Gorman <mgorman@...e.de>, lkp@...org,
LKML <linux-kernel@...r.kernel.org>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Mel Gorman <mgorman@...hsingularity.net>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Hugh Dickins <hughd@...gle.com>,
Darren Hart <dvhart@...ux.intel.com>, Chris Mason <clm@...com>,
Thomas Gleixner <tglx@...utronix.de>,
Davidlohr Bueso <dbueso@...e.de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [lkp] [futex] 65d8fc777f: +25.6% will-it-scale.per_process_ops
* kernel test robot <ying.huang@...ux.intel.com> wrote:
> FYI, we noticed the below changes on
>
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> commit 65d8fc777f6dcfee12785c057a6b57f679641c90 ("futex: Remove requirement for
> lock_page() in get_futex_key()")
I have asked for this before, but let me try again: could you _PLEASE_ make these
emails more readable?
For example what are the 'below changes'? Changes in the profile output? Profiles
always change from run to run, so that alone is not informative.
Also, there are a lot of changes - which ones prompted the email to be generated?
All in one, this email is hard to parse, because it just dumps a lot of
information with very little explanatory structure for someone not versed in their
format. Please try to create an easy to parse 'story' that leads the reader
towards what you want these emails to tell - not just a raw dump of seemingly
unconnected pieces of data ...
Thanks,
Ingo
>
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase:
> gcc-4.9/performance/x86_64-rhel/debian-x86_64-2015-02-07.cgz/lkp-sbx04/futex1/will-it-scale
>
> commit:
> 8ad7b378d0d016309014cae0f640434bca7b5e11
> 65d8fc777f6dcfee12785c057a6b57f679641c90
>
> 8ad7b378d0d01630 65d8fc777f6dcfee12785c057a
> ---------------- --------------------------
> %stddev %change %stddev
> \ | \
> 5076304 ± 0% +25.6% 6374220 ± 0% will-it-scale.per_process_ops
> 1194117 ± 0% +14.4% 1366153 ± 1% will-it-scale.per_thread_ops
> 0.58 ± 0% -2.0% 0.57 ± 0% will-it-scale.scalability
> 6820 ± 0% -19.6% 5483 ± 15% meminfo.AnonHugePages
> 2652 ± 5% -10.4% 2375 ± 2% vmstat.system.cs
> 2848 ± 32% +141.2% 6870 ± 65% numa-meminfo.node1.Active(anon)
> 2832 ± 31% +57.6% 4465 ± 27% numa-meminfo.node1.AnonPages
> 15018 ± 12% -23.3% 11515 ± 15% numa-meminfo.node2.AnonPages
> 1214 ± 14% -22.8% 936.75 ± 20% numa-meminfo.node3.PageTables
> 712.25 ± 32% +141.2% 1718 ± 65% numa-vmstat.node1.nr_active_anon
> 708.25 ± 31% +57.7% 1116 ± 27% numa-vmstat.node1.nr_anon_pages
> 3754 ± 12% -23.3% 2879 ± 15% numa-vmstat.node2.nr_anon_pages
> 304.75 ± 14% -23.1% 234.50 ± 20% numa-vmstat.node3.nr_page_table_pages
> 3.53 ± 1% -100.0% 0.00 ± -1% perf-profile.cycles.___might_sleep.__might_sleep.get_futex_key.futex_wake.do_futex
> 4.34 ± 1% -100.0% 0.00 ± -1% perf-profile.cycles.__might_sleep.get_futex_key.futex_wake.do_futex.sys_futex
> 1.27 ± 3% -100.0% 0.00 ± -1% perf-profile.cycles.__wake_up_bit.unlock_page.get_futex_key.futex_wake.do_futex
> 4.36 ± 1% +29.6% 5.65 ± 1% perf-profile.cycles.drop_futex_key_refs.isra.12.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
> 6.69 ± 1% +28.1% 8.57 ± 0% perf-profile.cycles.entry_SYSCALL_64
> 6.73 ± 0% +30.6% 8.79 ± 0% perf-profile.cycles.entry_SYSCALL_64_after_swapgs
> 74.21 ± 0% -11.0% 66.06 ± 0% perf-profile.cycles.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
> 59.05 ± 0% -21.4% 46.40 ± 0% perf-profile.cycles.get_futex_key.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
> 4.12 ± 0% +78.5% 7.36 ± 1% perf-profile.cycles.get_futex_key_refs.isra.11.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
> 2.27 ± 3% +24.1% 2.82 ± 4% perf-profile.cycles.get_user_pages_fast.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
> 26.95 ± 0% +30.0% 35.04 ± 1% perf-profile.cycles.get_user_pages_fast.get_futex_key.futex_wake.do_futex.sys_futex
> 13.43 ± 0% +27.2% 17.09 ± 1% perf-profile.cycles.gup_pte_range.gup_pud_range.get_user_pages_fast.get_futex_key.futex_wake
> 19.66 ± 1% +28.4% 25.24 ± 0% perf-profile.cycles.gup_pud_range.get_user_pages_fast.get_futex_key.futex_wake.do_futex
> 4.33 ± 1% +37.0% 5.93 ± 4% perf-profile.cycles.hash_futex.do_futex.sys_futex.entry_SYSCALL_64_fastpath
> 13.59 ± 0% -100.0% 0.00 ± -1% perf-profile.cycles.unlock_page.get_futex_key.futex_wake.do_futex.sys_futex
> 15160 ± 19% -34.8% 9883 ± 0% sched_debug.cfs_rq:/.exec_clock.min
> 27.25 ± 15% -37.6% 17.00 ± 8% sched_debug.cfs_rq:/.load_avg.7
> 21.00 ± 38% -27.4% 15.25 ± 2% sched_debug.cpu.cpu_load[2].1
> 21.00 ± 38% -27.4% 15.25 ± 2% sched_debug.cpu.cpu_load[3].1
> 21.00 ± 38% -27.4% 15.25 ± 2% sched_debug.cpu.cpu_load[4].1
> 1790 ± 0% +42.4% 2549 ± 45% sched_debug.cpu.curr->pid.21
> 50033 ± 4% -6.8% 46622 ± 4% sched_debug.cpu.nr_load_updates.29
> 4398 ± 42% +103.5% 8949 ± 23% sched_debug.cpu.nr_switches.11
> 7452 ± 34% +111.3% 15744 ± 54% sched_debug.cpu.nr_switches.20
> 3739 ± 13% +213.5% 11723 ± 40% sched_debug.cpu.nr_switches.23
> 1648 ± 53% +96.5% 3239 ± 63% sched_debug.cpu.nr_switches.51
> 0.25 ±519% -1300.0% -3.00 ±-52% sched_debug.cpu.nr_uninterruptible.24
> 8632 ± 16% -32.5% 5823 ± 19% sched_debug.cpu.sched_count.1
> 5091 ± 36% +137.5% 12092 ± 31% sched_debug.cpu.sched_count.11
> 12453 ± 90% -74.6% 3159 ± 24% sched_debug.cpu.sched_count.2
> 7782 ± 32% +118.2% 16977 ± 46% sched_debug.cpu.sched_count.20
> 2665 ± 48% -49.8% 1337 ± 30% sched_debug.cpu.sched_count.32
> 1365 ± 11% -14.0% 1174 ± 3% sched_debug.cpu.sched_count.45
> 1693 ± 51% +147.7% 4193 ± 42% sched_debug.cpu.sched_count.51
> 5023 ± 57% -51.5% 2434 ± 43% sched_debug.cpu.sched_count.57
> 1705 ± 16% +129.6% 3915 ± 48% sched_debug.cpu.sched_goidle.23
> 536.25 ± 14% -18.7% 435.75 ± 2% sched_debug.cpu.sched_goidle.45
> 1228 ± 19% -27.3% 892.50 ± 17% sched_debug.cpu.sched_goidle.5
> 1919 ± 55% +88.5% 3617 ± 37% sched_debug.cpu.ttwu_count.11
> 7699 ± 35% -43.7% 4335 ± 43% sched_debug.cpu.ttwu_count.24
> 5380 ± 36% -45.6% 2926 ± 18% sched_debug.cpu.ttwu_count.30
> 563.25 ± 20% +140.3% 1353 ± 38% sched_debug.cpu.ttwu_local.11
> 4297 ± 46% -49.1% 2186 ± 39% sched_debug.cpu.ttwu_local.24
> 2828 ± 47% -47.8% 1475 ± 34% sched_debug.cpu.ttwu_local.27
> 3243 ± 36% -54.3% 1482 ± 32% sched_debug.cpu.ttwu_local.30
> 199.25 ± 6% +100.6% 399.75 ± 32% sched_debug.cpu.ttwu_local.44
> 1158 ± 64% -67.3% 379.00 ± 46% sched_debug.cpu.ttwu_local.54
> 242.25 ± 21% +51.0% 365.75 ± 19% sched_debug.cpu.ttwu_local.55
> 1009 ± 26% -50.8% 496.50 ± 44% sched_debug.cpu.ttwu_local.59
> 1736 ± 53% -67.8% 559.25 ± 22% sched_debug.cpu.ttwu_local.9
>
>
> lkp-sbx04: Sandy Bridge-EX
> Memory: 64G
>
>
> perf-profile.cycles.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
>
> 76 ++---------------------------------------------------------------------+
> | |
> 74 ++ .*.. .*..*..*.. .*.. .*.. .*.. .*.. .*..*..*..* |
> *..*. *..*..*. *..*. *.*. *. *. *. |
> | |
> 72 ++ |
> | |
> 70 ++ |
> | |
> 68 ++ |
> | |
> | O O O O O O O O O O O |
> 66 O+ O O O O O
> | O O O O O O O |
> 64 ++-------------O-------------------------------------------------------+
>
>
>
> will-it-scale.per_process_ops
>
> 6.6e+06 O+----O-O--O------------------------------------------------------+
> | O O O O O |
> 6.4e+06 ++ O O O O O O O O O O O O O O O O
> | |
> 6.2e+06 ++ |
> 6e+06 ++ |
> | |
> 5.8e+06 ++ |
> | |
> 5.6e+06 ++ |
> 5.4e+06 ++ |
> | |
> 5.2e+06 ++ |
> *..*..*.*..*..*..*.*..*..*..*.*..*..*..*.*..*..*..*.*..*..*..*.* |
> 5e+06 ++----------------------------------------------------------------+
>
>
> [*] bisect-good sample
> [O] bisect-bad sample
>
> To reproduce:
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
> cd lkp-tests
> bin/lkp install job.yaml # job file is attached in this email
> bin/lkp run job.yaml
>
>
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
>
>
> Thanks,
> Ying Huang
> ---
> LKP_SERVER: inn
> LKP_CGI_PORT: 80
> LKP_CIFS_PORT: 139
> testcase: will-it-scale
> default-monitors:
> wait: activate-monitor
> kmsg:
> uptime:
> iostat:
> heartbeat:
> vmstat:
> numa-numastat:
> numa-vmstat:
> numa-meminfo:
> proc-vmstat:
> proc-stat:
> interval: 10
> meminfo:
> slabinfo:
> interrupts:
> lock_stat:
> latency_stats:
> softirqs:
> bdi_dev_mapping:
> diskstats:
> nfsstat:
> cpuidle:
> cpufreq-stats:
> turbostat:
> pmeter:
> sched_debug:
> interval: 60
> cpufreq_governor: performance
> default-watchdogs:
> oom-killer:
> watchdog:
> commit: 65d8fc777f6dcfee12785c057a6b57f679641c90
> model: Sandy Bridge-EX
> nr_cpu: 64
> memory: 64G
> nr_ssd_partitions: 7
> ssd_partitions: "/dev/disk/by-id/ata-INTEL_SSDSC2*-part1"
> swap_partitions:
> category: benchmark
> perf-profile:
> freq: 800
> will-it-scale:
> test: futex1
> queue: bisect
> testbox: lkp-sbx04
> tbox_group: lkp-sbx04
> kconfig: x86_64-rhel
> enqueue_time: 2016-02-28 23:45:52.199165563 +08:00
> compiler: gcc-4.9
> rootfs: debian-x86_64-2015-02-07.cgz
> id: 6b2c2bd744dd898009648cb82de7e0ba77de33f1
> user: lkp
> head_commit: ed520c327c4259ec08b1677023087f658329b961
> base_commit: 81f70ba233d5f660e1ea5fe23260ee323af5d53a
> branch: linux-devel/devel-hourly-2016022811
> result_root: "/result/will-it-scale/performance-futex1/lkp-sbx04/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/0"
> job_file: "/lkp/scheduled/lkp-sbx04/bisect_will-it-scale-performance-futex1-debian-x86_64-2015-02-07.cgz-x86_64-rhel-65d8fc777f6dcfee12785c057a6b57f679641c90-20160228-23650-17c4qc1-0.yaml"
> max_uptime: 1500
> initrd: "/osimage/debian/debian-x86_64-2015-02-07.cgz"
> bootloader_append:
> - root=/dev/ram0
> - user=lkp
> - job=/lkp/scheduled/lkp-sbx04/bisect_will-it-scale-performance-futex1-debian-x86_64-2015-02-07.cgz-x86_64-rhel-65d8fc777f6dcfee12785c057a6b57f679641c90-20160228-23650-17c4qc1-0.yaml
> - ARCH=x86_64
> - kconfig=x86_64-rhel
> - branch=linux-devel/devel-hourly-2016022811
> - commit=65d8fc777f6dcfee12785c057a6b57f679641c90
> - BOOT_IMAGE=/pkg/linux/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/vmlinuz-4.5.0-rc3-00235-g65d8fc7
> - max_uptime=1500
> - RESULT_ROOT=/result/will-it-scale/performance-futex1/lkp-sbx04/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/0
> - LKP_SERVER=inn
> - |2-
>
>
> earlyprintk=ttyS0,115200 systemd.log_level=err
> debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100
> panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0
> console=ttyS0,115200 console=tty0 vga=normal
>
> rw
> lkp_initrd: "/lkp/lkp/lkp-x86_64.cgz"
> modules_initrd: "/pkg/linux/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/modules.cgz"
> bm_initrd: "/osimage/deps/debian-x86_64-2015-02-07.cgz/lkp.cgz,/osimage/deps/debian-x86_64-2015-02-07.cgz/run-ipconfig.cgz,/osimage/deps/debian-x86_64-2015-02-07.cgz/turbostat.cgz,/lkp/benchmarks/turbostat.cgz,/osimage/deps/debian-x86_64-2015-02-07.cgz/will-it-scale.cgz,/lkp/benchmarks/will-it-scale.cgz,/lkp/benchmarks/will-it-scale-x86_64.cgz"
> linux_headers_initrd: "/pkg/linux/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/linux-headers.cgz"
> repeat_to: 2
> kernel: "/pkg/linux/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/vmlinuz-4.5.0-rc3-00235-g65d8fc7"
> dequeue_time: 2016-02-28 23:46:33.938915178 +08:00
> job_state: finished
> loadavg: 45.27 20.12 7.84 2/649 11559
> start_time: '1456674445'
> end_time: '1456674754'
> version: "/lkp/lkp/.src-20160226-194908"
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu10/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu11/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu12/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu13/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu14/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu15/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu16/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu17/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu18/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu19/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu20/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu21/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu22/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu23/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu24/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu25/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu26/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu27/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu28/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu29/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu30/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu31/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu32/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu33/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu34/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu35/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu36/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu37/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu38/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu39/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu40/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu41/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu42/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu43/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu44/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu45/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu46/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu47/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu48/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu49/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu5/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu50/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu51/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu52/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu53/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu54/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu55/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu56/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu57/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu58/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu59/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu6/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu60/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu61/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu62/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu63/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu7/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu8/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu9/cpufreq/scaling_governor
> 2016-02-28 23:47:25 ./runtest.py futex1 16 both 1 8 16 24 32 48 64
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