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CPU utlization

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# 1  
Old 03-31-2010
CPU utlization
Hi

I have server with 48 cpus running SUN os.

I have loaded with enough tasks. But I could see my CPU utilization is very less compared to kernal's cpu utlization.

below is the output of top command

Code:
load averages:  23.2,  10.1,  16.6;                    up 423+16:45:16                                                               12:15:10
781 processes: 750 sleeping, 31 on cpu
CPU states: 39.1% idle, 12.4% user, 48.6% kernel,  0.0% iowait,  0.0% swap
Memory: 192G phys mem, 148G free mem, 16G total swap, 16G free swap
   PID USERNAME LWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
 16042 cgi        1  20    0   27M   16M cpu/1    0:20  1.95% dcs_operation_m
 16357 cgi        1  20    0   27M   16M cpu/531   0:10  1.95% dcs_operation_m
 15738 cgi        1  20    0   27M   16M cpu/528   0:33  1.95% dcs_operation_m
 16125 cgi        1  20    0   27M   16M cpu/3    0:16  1.95% dcs_operation_m
 15981 cgi        1  20    0   27M   16M cpu/10   0:22  1.95% dcs_operation_m
 16046 cgi        1  20    0   27M   16M cpu/17   0:20  1.94% dcs_operation_m
 16127 cgi        1  20    0   27M   16M cpu/4    0:15  1.94% dcs_operation_m
 16128 cgi        1  20    0   27M   16M cpu/8    0:15  1.94% dcs_operation_m
 16745 cgi        1  20    0   27M   16M cpu/13   0:07  1.94% dcs_operation_m
 15822 cgi        1  20    0   27M   16M cpu/532   0:29  1.94% dcs_operation_m
 16748 cgi        1  20    0   27M   16M cpu/520   0:06  1.94% dcs_operation_m
 15939 cgi        1  30    0   27M   16M cpu/5    0:25  1.94% dcs_operation_m
 16045 cgi        1  20    0   27M   16M cpu/513   0:20  1.94% dcs_operation_m
 16683 cgi        1  20    0   27M   16M cpu/533   0:07  1.94% dcs_operation_m
 15980 cgi        1  20    0   27M   16M cpu/516   0:22  1.94% dcs_operation_m

By that we can see there were no I/O bound and swap issues.

Could anyone assist me on this.

Thanks

Kumaran R
Last edited by pludi; 03-31-2010 at 03:59 AM.. Reason: code tags, please...
# 2  
Old 03-31-2010
I'll try to explain the percentages to the best of my knowledge:
  • idle: should be obvious
  • user: the time the processes run in user space. That is loops and all in-memory operations
  • kernel: the time spent in kernel space. Everything I/O runs in kernel space, that is: reading & writing files, network communication, user I/O (when not sleeping), loading/forking new processes, ...
  • iowait: the time waiting for an I/O device to come ready. As long as this is 0, none of your processes had to wait for a disk to come ready, or was blocked by a slow net connection.
  • swap: if this is zero it basically means none of your processes had to be swapped out, so your current memory installation is enough.
# 3  
Old 03-31-2010
Thanks for you explanations.

Could you please tell me why the process are using very less CPU(1.9%) though it has more room to use.

Kumaran R
# 4  
Old 03-31-2010
Probably because it's a percentage of the total, instead of the percentage of a core. But I'm no Solaris expert, so I could be wrong.
# 5  
Old 03-31-2010
But another SunOS running the same application projects good (60%+) cpu usage.

Is there any way to improve this.

is it directly related to the thorughput ?

Kumaran R
# 6  
Old 03-31-2010
Your load averages look pretty high. Are you experiencing slow-down issues?
# 7  
Old 03-31-2010
Quote:
Originally Posted by druidmatrix
Your load averages look pretty high. Are you experiencing slow-down issues?
On a 48 core machine any load below 48 isn't high. With a load of 23, one could even go so far as to say it's bored half of the time.

Quote:
Originally Posted by kumaran_5555
Could you please tell me why the process are using very less CPU(1.9%) though it has more room to use.
Without knowing your setup and your application, and without being an expert in Solaris: no.
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