From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@digeo.com>,
bzzz@tmi.comex.ru, adilger@clusterfs.com,
linux-kernel@vger.kernel.org, ext2-devel@lists.sourceforge.net
Subject: Re: [PATCH] concurrent block allocation for ext2 against 2.5.64
Date: Sat, 15 Mar 2003 00:24:31 -0800 [thread overview]
Message-ID: <20030315082431.GG5891@holomorphy.com> (raw)
In-Reply-To: <20030315070511.GQ20188@holomorphy.com>
On Fri, Mar 14, 2003 at 10:44:13PM -0800, Andrew Morton wrote:
>> Nope. What we're trying to measure here is pure in-memory lock contention,
>> locked bus traffic, context switches, etc, etc. To do that we need to get
>> the IO system out of the picture.
>> One way to do that is to increase /proc/sys/vm/dirty_ratio and
>> dirty_background_ratio to 70% or so. You can still hit IO wait if someone
>> tries to truncate a file which pdflush is writing out, so increase
>> dirty_expire_centisecs and dirty_writeback_centisecs to 1000000000 or so...
>> Then, on the second run, when all the required metadata blocks are in
>> pagecache you should be able to get an IO-free run.
>
On Fri, Mar 14, 2003 at 11:05:11PM -0800, William Lee Irwin III wrote:
> Oh, sorry, I did increase dirty_ratio and dirty_background_ratio to 99,
> I forgot about dirty_writeback_centisecs though, I'll re-run with that.
Next pass involves lockmeter:
$ cat /proc/sys/vm/dirty_expire_centisecs
360000
$ cd /test/wli
$ ls
$ (time dbench 128) |& tee -a ~/dbench.output.log.7
zsh: correct '~/dbench.output.log.7' to '~/dbench.output.log.6' [nyae]? n
128 clients started
0 62477 206.65 MB/sec
Throughput 206.651 MB/sec 128 procs
dbench 128 143.50s user 3258.66s system 1574% cpu 3:36.04 total
vma samples %-age symbol name
c0106ff4 7617343 29.5286 default_idle
c01dc3b0 5212934 20.2079 __copy_to_user_ll
c01dc418 1806434 7.00263 __copy_from_user_ll
c0264bd0 1595815 6.18617 sync_buffer
c0108140 712115 2.76051 .text.lock.semaphore
c0119058 621494 2.40922 try_to_wake_up
c011a1bc 409622 1.5879 schedule
c0107d0c 278704 1.08039 __down
c011c4ff 263802 1.02263 .text.lock.sched
c0152ab0 260394 1.00942 __find_get_block_slow
c011fadc 247423 0.959134 profile_hook
c0264da0 231721 0.898265 add_event_entry
c0168aac 223276 0.865528 d_lookup
c01dc510 212968 0.825569 atomic_dec_and_lock
c0119dac 208443 0.808028 scheduler_tick
c015f3dc 192765 0.747253 path_lookup
c01522a0 191853 0.743717 file_move
c0119860 188927 0.732375 load_balance
c0122930 168016 0.651313 current_kernel_time
c010f6b8 166633 0.645952 timer_interrupt
c013ece4 160376 0.621697 check_highmem_ptes
c0133118 155858 0.604183 find_get_page
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
0 0 48309664 568288 23360 0 0 1026 18 0 0 100 0
0 0 48274208 568288 23392 0 0 1028 256 0 1 99 0
91 0 48192928 569056 58272 0 0 1036 1790 1 20 79 0
49 0 47769920 580224 439808 0 0 1024 5071 2 94 4 0
70 0 47437248 582720 773952 0 0 1030 2366 1 95 5 0
56 1 47140576 586656 1062272 0 0 1022 1931 1 97 3 0
86 0 46901920 581568 1307168 0 0 1025 1800 0 98 2 0
55 0 46619744 584672 1585568 0 0 1028 2584 1 93 5 0
26 1 46343712 577600 1867360 0 0 1025 3387 1 87 12 1
20 0 46033184 575936 2176384 0 0 1028 5742 2 67 30 1
27 1 45834912 577056 2366304 0 0 1027 6072 2 66 31 1
24 1 45692128 577184 2504960 16 0 1029 8056 2 56 41 1
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
18 0 45533280 581376 2659648 32 0 1037 8107 2 57 40 1
23 1 45386464 575264 2810592 32 0 1036 8227 2 54 42 2
4 4 45342240 577056 2852768 360 0 1112 3217 1 14 81 5
11 1 45283040 576160 2911712 140 0 1065 9003 1 26 71 2
8 1 45221856 580064 2968128 64 0 1043 11620 2 31 66 1
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28 0 45332448 576672 2855968 0 0 1026 9073 3 50 47 0
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
17 0 45365536 578496 2821440 4 0 1028 8403 3 53 44 0
14 0 45353056 572768 2840352 0 592 1173 7842 3 60 37 0
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9 0 45216032 576032 2972800 0 0 1026 8795 3 53 44 0
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18 0 45312992 578080 2874432 0 0 1027 8791 3 51 46 0
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30 0 45319840 575648 2871040 0 0 1032 7647 3 61 36 0
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16 0 45255520 578240 2932256 12 0 1030 9372 2 44 54 0
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24 0 45214304 575776 2974880 0 0 1027 9274 3 50 47 0
20 0 45263712 576608 2923520 0 0 1026 8689 3 50 48 0
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
22 0 45320800 577440 2867328 0 0 1027 9487 2 47 50 0
19 0 45344416 571488 2849888 0 632 1079 8074 3 58 39 0
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20 0 45218080 572128 2976416 0 988 1168 9526 3 50 47 1
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
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21 0 45312608 573024 2879936 0 0 1026 9444 3 48 49 0
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28 0 45212512 574976 2979936 0 0 1026 9132 3 52 45 0
procs -----------memory--------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
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procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
20 0 45218656 573344 2974624 0 0 1030 10204 2 44 54 0
35 0 45216480 573664 2976992 0 0 1049 8737 2 51 46 0
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17 0 45251360 574848 2941888 0 0 1081 9679 3 48 50 0
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
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18 0 45306720 573984 2887360 0 0 1026 8670 2 55 43 0
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
16 0 45282016 574176 2911232 0 0 1028 9431 3 50 48 0
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31 0 45304480 575520 2887328 0 0 1025 7851 3 60 37 0
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29 0 45261472 577632 2927264 0 0 1035 8997 3 54 43 0
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22 0 45308960 578336 2880864 0 0 1027 9218 3 52 46 0
18 0 45328160 578560 2861120 0 0 1025 8907 2 51 47 0
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
22 0 45304480 578784 2884768 0 0 1026 8257 2 52 45 0
36 0 45279776 578912 2909472 0 0 1027 8651 2 54 43 0
28 0 45254624 579104 2933280 0 0 1026 9417 3 49 48 0
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20 0 45216800 579552 2972384 0 0 1023 8923 2 51 47 0
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18 2 45365152 579776 2822816 220 0 1079 8644 3 56 40 1
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19 13 45499040 576800 2691584 184 252 1229 14054 2 52 31 15
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36 49 45656672 585472 2524128 616 288 1236 21734 2 61 14 23
34 47 45793248 580544 2391296 564 384 1251 26024 2 67 10 21
20 5 45992672 582432 2189312 272 896 1338 19731 2 75 9 15
16 107 46253536 578656 1932672 832 524 1157 41761 1 54 9 36
1 106 46416608 575776 1792800 472 1200 1212 37282 0 23 11 66
7 100 46468000 578784 1739456 392 1776 1201 20277 0 7 4 89
1 100 46538208 571104 1679872 524 16 1234 22199 0 8 3 88
0 99 46624480 578016 1587840 892 0 1255 32708 0 11 3 85
procs -----------memory---------- -----io---- --system-- ----cpu----
r b free buff cache bi bo in cs us sy id wa
16 95 46728928 573920 1487168 916 44 1259 35577 0 12 2 86
1 98 46829792 570080 1392160 860 52 1261 32797 0 12 4 85
10 94 46924640 576640 1292160 860 0 1251 33826 0 12 1 87
8 91 47017376 572576 1205824 808 24 1245 29650 0 10 2 87
2 90 47122592 579392 1096864 904 0 1256 35883 0 13 2 86
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8 81 47411872 578720 815584 892 4 1260 46037 0 18 5 77
5 66 47588576 576832 651200 740 4 1229 42522 0 17 9 74
8 48 47851872 573696 413280 760 4 1237 43504 0 19 15 66
5 24 48114848 579616 164448 760 0 1244 31623 0 15 25 60
0 0 48296032 575456 21280 396 0 1155 7253 0 6 70 24
0 0 48296160 575456 21408 4 0 1028 88 0 1 99 0
0 0 48295456 575488 21664 44 0 1037 174 0 1 98 0
0 0 48295456 575488 21664 0 0 1025 20 0 0 100 0
0 0 48295456 575488 21664 0 0 1025 18 0 0 100 0
0 0 48295456 575488 21664 0 0 1025 22 0 0 100 0
next prev parent reply other threads:[~2003-03-15 8:14 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-13 8:55 [PATCH] concurrent block allocation for ext2 against 2.5.64 Alex Tomas
2003-03-13 9:58 ` Andrew Morton
2003-03-13 19:17 ` Alex Tomas
2003-03-13 22:25 ` Andrew Morton
2003-03-13 23:03 ` Andreas Dilger
2003-03-13 23:10 ` Andrew Morton
2003-03-13 23:03 ` Alex Tomas
2003-03-13 23:25 ` Andrew Morton
2003-03-13 23:56 ` Andreas Dilger
2003-03-14 7:20 ` Alex Tomas
2003-03-14 20:59 ` Andreas Dilger
2003-03-14 21:14 ` Alex Tomas
2003-03-15 4:37 ` William Lee Irwin III
2003-03-15 4:54 ` Andrew Morton
2003-03-15 5:30 ` William Lee Irwin III
2003-03-15 5:43 ` Martin J. Bligh
2003-03-15 5:50 ` William Lee Irwin III
2003-03-15 5:49 ` William Lee Irwin III
2003-03-15 6:20 ` William Lee Irwin III
2003-03-15 6:44 ` Andrew Morton
2003-03-15 7:05 ` William Lee Irwin III
2003-03-15 8:24 ` William Lee Irwin III [this message]
2003-03-15 9:47 ` William Lee Irwin III
2003-03-15 11:58 ` William Lee Irwin III
2003-03-15 12:08 ` Andrew Morton
2003-03-15 12:25 ` William Lee Irwin III
2003-03-15 8:16 ` [Ext2-devel] " Alex Tomas
2003-03-15 8:29 ` William Lee Irwin III
2003-03-15 8:32 ` Alex Tomas
2003-03-15 9:23 ` William Lee Irwin III
2003-03-14 18:25 ` Martin J. Bligh
2003-03-14 19:30 ` [Ext2-devel] " Daniel Phillips
2003-03-14 19:55 ` Andrew Morton
2003-03-13 17:39 ` [Ext2-devel] " Andreas Dilger
2003-03-13 18:43 ` Alex Tomas
2003-03-13 19:09 ` Matthew Wilcox
2003-03-13 19:39 ` Andrew Morton
2003-03-13 19:23 ` Theodore Ts'o
2003-03-13 19:44 ` Andreas Dilger
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