2014-02-20 13:07:28

by Fengguang Wu

Subject: [x86] 339a3922f6: +4.3% aim7 jobs-per-min

Hi Maarten,

We are glad to find that your commit 339a3922f68dcb7d93001f07b7e914d5cf6c066d
("decrease useless padding") increased aim disk_src performance by 4.3%:

74833276be6802b 339a3922f68dcb7d93001f07b
--------------- -------------------------
511685 ~ 0% +4.3% 533571 ~ 0% TOTAL aim7.2000.jobs-per-min
77.30 ~ 0% -9.9% 69.66 ~ 0% TOTAL time.system_time
1.95 ~ 2% +7.0% 2.09 ~ 2% TOTAL iostat.sda.rrqm/s
23.57 ~ 0% -4.1% 22.60 ~ 0% TOTAL time.elapsed_time
425 ~ 0% -3.1% 412 ~ 0% TOTAL time.percent_of_cpu_this_job_got
7.59 ~ 0% -2.9% 7.37 ~ 0% TOTAL boottime.dhcp
15.24 ~ 0% -1.9% 14.94 ~ 0% TOTAL boottime.boot

time.system_time

82 ++--------------------------------------------------------------------+
| |
80 ++ ..*.. |
| .*.. .*. .*.. |
78 ++.*..*..*..*..*..*. *.. .*. *..*. *..*.. .*..* |
*. *. *..*..*. |
76 ++ |
| |
74 ++ |
| |
72 ++ |
| |
70 O+ O O O O O O O O O O O O O O O O O O |
| O O O O
68 ++-------------------------O------------------------------------------+


time.elapsed_time

24 ++------------------------------------------------------------------+
| *.. |
23.8 ++ + *.. |
*..*.. .*.. .*..*..*.. .*..* *..*..*..*.. .*.. |
23.6 ++ *. *..*. *. *..*..*. * |
23.4 ++ |
| |
23.2 ++ |
| |
23 ++ |
| |
22.8 ++ O O O O O |
22.6 O+ O O O O O O O O O O O O O O O O O
| O |
22.4 ++------------------------------------------------------------------+


aim7.2000.jobs-per-min

540000 ++----------------------------------------------------------------+
| |
535000 O+ O O O O O O O O O O O O O |
530000 ++ O O O O O O O O O O
| |
525000 ++ |
| |
520000 ++ |
| |
515000 ++ .*. |
510000 *+.*..*..*.*..*..*..*..*..*.. .*. *.. .* |
| *..*. .*..*..*..*. *. |
505000 ++ *..*. |
| |
500000 ++----------------------------------------------------------------+

2014-02-20 13:13:26

by Maarten Lankhorst

Subject: Re: [x86] 339a3922f6: +4.3% aim7 jobs-per-min

op 20-02-14 14:06, Fengguang Wu schreef:
> Hi Maarten,
>
> We are glad to find that your commit 339a3922f68dcb7d93001f07b7e914d5cf6c066d
> ("decrease useless padding") increased aim disk_src performance by 4.3%:
>
> 74833276be6802b 339a3922f68dcb7d93001f07b
> --------------- -------------------------
> 511685 ~ 0% +4.3% 533571 ~ 0% TOTAL aim7.2000.jobs-per-min
> 77.30 ~ 0% -9.9% 69.66 ~ 0% TOTAL time.system_time
> 1.95 ~ 2% +7.0% 2.09 ~ 2% TOTAL iostat.sda.rrqm/s
> 23.57 ~ 0% -4.1% 22.60 ~ 0% TOTAL time.elapsed_time
> 425 ~ 0% -3.1% 412 ~ 0% TOTAL time.percent_of_cpu_this_job_got
> 7.59 ~ 0% -2.9% 7.37 ~ 0% TOTAL boottime.dhcp
> 15.24 ~ 0% -1.9% 14.94 ~ 0% TOTAL boottime.boot
>
Really? I just did it to get rid of the 15-byte nop sequences with tons of prefixes.
Interesting..

~Maarten