worker cpu balance

[Aleksandar Lazic]

On Son 13.04.2008 12:36, Igor Sysoev wrote:
>On Sun, Apr 13, 2008 at 03:04:20AM +0200, Aleksandar Lazic wrote:
>
>> It works fast. Since it uses sendfile, it is as fast as Tux on large
>> files (>= 1MB), and saturates 10 Gbps with 10% of CPU with 1MB files.
>> 
>> However, it does not scale on multiple CPUs, whatever the number of
>> worker_processes. I've tried 1, 2, 8, ... The processes are quite
>> there, but something's preventing them from sharing a resource since
>> the machine never goes beyond 50% CPU used (it's a dual
>> core). Sometimes, "top" looks like this :
[snipp]
>Try
>
>events {
>    accept_mutex   off;
>    ...

Thanks but not so much changes ;-(, any further tuning options?

With mutex off 4925
Cpu0  :  1.0%us,  2.0%sy,  0.0%ni, 74.0%id,  0.0%wa,  0.0%hi, 23.0%si,  0.0%st
Cpu1  :  3.0%us,  2.0%sy,  0.0%ni, 70.0%id,  0.0%wa,  1.0%hi, 24.0%si,  0.0%st
Mem:   2075780k total,  2053376k used,    22404k free,     4420k buffers
Swap:  4096532k total,      192k used,  4096340k free,  1860656k cached

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                         
  1969 al        15   0  3364 1564  540 S   12  0.1   0:20.82 nginx                                                                            
  1968 al        15   0  3364 1604  544 R    0  0.1   0:31.64 nginx

###
Without mutex settings 4976
Cpu0  :  0.4%us,  3.2%sy,  0.0%ni, 93.2%id,  0.3%wa,  0.2%hi,  2.8%si,  0.0%st
Cpu1  :  0.5%us,  4.6%sy,  0.0%ni, 91.6%id,  0.2%wa,  0.2%hi,  2.9%si,  0.0%st
Mem:   2075780k total,  2046476k used,    29304k free,     4464k buffers
Swap:  4096532k total,      192k used,  4096340k free,  1860656k cached

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                         
  2016 al        15   0  3308 1532  540 S   23  0.1   0:10.15 nginx                                                                            
  2015 al        15   0  3308 1520  544 S    6  0.1   0:01.08 nginx
###

Could be the scheduler a point for optimization, or am I on the wrong
way?!


### lighty 5144
Cpu0  :  7.0%us,  5.0%sy,  0.0%ni, 66.0%id,  0.0%wa,  3.0%hi, 19.0%si,  0.0%st
Cpu1  : 12.0%us,  5.0%sy,  0.0%ni, 62.0%id,  0.0%wa,  3.0%hi, 18.0%si,  0.0%st
Mem:   2075780k total,  2005220k used,    70560k free,     4484k buffers
Swap:  4096532k total,      192k used,  4096340k free,  1866996k cached

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                         
  2032 root      15   0 36508 1768  900 S   24  0.1   0:02.36 lighttpd                                                                         
  2031 root      15   0 36512 1716  900 S   19  0.1   0:01.40 lighttpd
###

I'am ready to help to improve nginx but for know it looks to me that
lighty 1.5 is a little bit faster.

How ever I stay to nginx, I like it more ;-))

Cheers

Aleks