linux-kernel - Re: apache threads not balanced over all CPU cores, schedular problem or apache?

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Message-ID: <001f01c94585$799bf280$0a01a8c0@kylecea1512a3f>
Date:	Thu, 13 Nov 2008 19:46:32 +0800
From:	"kyle" <kylewong@...tha.com>
To:	"Rahul Pydimukkala" <prahul@....iitk.ac.in>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: apache threads not balanced over all CPU cores, schedular problem or apache?

From: "Rahul Pydimukkala" <prahul@....iitk.ac.in>
To: "kyle" <kylewong@...tha.com>
Cc: <linux-kernel@...r.kernel.org>
Sent: Thursday, November 13, 2008 10:34 PM
Subject: Re: apache threads not balanced over all CPU cores, schedular 
problem or apache?


> On 12:58 Thu 13 Nov     , kyle wrote:
>> Hi,
>>
>> Please cc me if possible.
>>
>> I have a machine with Intel Q9300 4-core CPU, 8GB RAM. It runs apache 
>> 2.0.63
>> with traditional prefork MPM.
>
> Yes, this is quite undesirable given that the kernel has a good 
> load-balancer.  Can you give more information regarding the kernel version 
> and load stats of individual apache processes as well?
> -
> Rahul
>

They now all load on cpu1 and cpu2.

top - 19:35:42 up 8 days, 22:36,  8 users,  load average: 1.77, 1.63, 1.75
Tasks: 251 total,   2 running, 249 sleeping,   0 stopped,   0 zombie
Cpu0  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si, 
0.0%st
Cpu1  : 14.1%us,  4.4%sy,  0.0%ni, 52.9%id, 27.2%wa,  0.0%hi,  1.5%si, 
0.0%st
Cpu2  :  4.3%us,  2.9%sy,  0.0%ni, 92.3%id,  0.0%wa,  0.0%hi,  0.5%si, 
0.0%st
Cpu3  :  0.5%us,  0.5%sy,  0.0%ni, 98.0%id,  1.0%wa,  0.0%hi,  0.0%si, 
0.0%st
Mem:   8117172k total,  8029032k used,    88140k free,   373356k buffers
Swap:   208824k total,     8576k used,   200248k free,  5884936k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  P COMMAND
15112 nobody    20   0  199m  10m 7344 S  2.5  0.1   0:00.94 2 httpd
14488 nobody    20   0  208m  17m 8400 S  2.0  0.2   0:02.06 1 httpd
15184 nobody    20   0  203m  12m 7652 S  2.0  0.2   0:00.69 1 httpd
15320 nobody    20   0  199m 9736 6556 S  2.0  0.1   0:00.29 2 httpd
15466 nobody    20   0  201m 9424 4684 S  2.0  0.1   0:00.05 2 httpd
15204 nobody    20   0  201m  10m 7380 S  1.5  0.1   0:00.66 2 httpd
15051 nobody    20   0  203m  12m 7716 S  1.0  0.2   0:01.43 2 httpd
15059 nobody    20   0  204m  13m 9232 S  1.0  0.2   0:01.22 2 httpd
15081 nobody    20   0  203m  12m 7724 S  1.0  0.2   0:00.95 2 httpd
15319 nobody    20   0  202m  12m 6376 S  1.0  0.2   0:00.26 1 httpd
15465 nobody    20   0  199m 8448 5396 S  1.0  0.1   0:00.05 2 httpd
15467 nobody    20   0  200m 8872 4568 S  1.0  0.1   0:00.02 2 httpd
12215 nobody    20   0  202m  13m 9756 S  0.5  0.2   0:05.54 2 httpd
13052 nobody    20   0  205m  14m 9.8m S  0.5  0.2   0:04.36 2 httpd
13433 nobody    20   0  203m  14m 9564 S  0.5  0.2   0:05.25 1 httpd 

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