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SubjectRe: [PATCH] concurrent block allocation for ext2 against 2.5.64
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
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0 0 48274208 568288 23392 0 0 1028 256 0 1 99 0
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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
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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
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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
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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
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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
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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
22 0 45304480 578784 2884768 0 0 1026 8257 2 52 45 0
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34 47 45793248 580544 2391296 564 384 1251 26024 2 67 10 21
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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
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