topic CPU Recognition in Operating System - Linux

CPU Recognition

CowBoy — Mon, 09 Feb 2009 10:51:26 GMT

Hi
Dear All
I have an ml570 with 4 dual core CPU and i installed a sles 10 but the problem is that the OS is using juast one cpu.
in /proc/cpuinfo there is 16 CPUs. but The OS is not working with them???????

Re: CPU Recognition

Ivan Ferreira — Mon, 09 Feb 2009 11:13:31 GMT

If you see the 16 CPU on /proc/cpuinfo, the system should be able to use all of them.

Â¿How did you determine that the OS is using just one of them?

Re: CPU Recognition

CowBoy — Mon, 09 Feb 2009 11:23:27 GMT

I use the top command and 90% of just one cpu is using!!!!!
issueing the command has delay also

Re: CPU Recognition

Ivan Ferreira — Mon, 09 Feb 2009 11:39:04 GMT

You could run the "mpstat -P ALL 5" command and ensure to run multiple processes to identify the load on each processor.

Re: CPU Recognition

CowBoy — Mon, 09 Feb 2009 11:59:36 GMT

Thanks Ivan
I saw all the 16 CPUs but another problem is that Oracle 10g r2 which is installed on the server just using 4 or 5 CPUs . and othe CPUs are idle??????

Re: CPU Recognition

PSS SYS ADMIN — Tue, 10 Feb 2009 13:57:04 GMT

Could be no ather process need ather processes?????

Re: CPU Recognition

PSS SYS ADMIN — Tue, 10 Feb 2009 13:57:54 GMT

Could be no other process need other processor?????

Re: CPU Recognition

Ivan Ferreira — Tue, 10 Feb 2009 14:15:37 GMT

Maybe, if you want to stress your system you need a benchmark tool, like hammerora, Swingbench or similar.

Re: CPU Recognition

Steven E. Protter — Tue, 10 Feb 2009 16:51:36 GMT

Shalom,

I see no valid reason for your original conclusion. The OS is going to use all CPU's available.

A quick look at top should show 16 cpus in this example.

SEP

Re: CPU Recognition

CowBoy — Wed, 11 Feb 2009 06:14:16 GMT

Hi Shalom
The Problem is A quick look at top does not show 16 cpus in this example?????

Re: CPU Recognition

Vitaly Karasik_1 — Wed, 11 Feb 2009 08:26:33 GMT

Press "1" into "top" - you'll see all your CPUs:

1,I Toggle SMP view: '1' single/separate states; 'I' Irix/Solaris mode

Re: CPU Recognition

CowBoy — Thu, 12 Feb 2009 06:20:22 GMT

Thank you everyone
Hi I saw the CPUs after pressing 1 but i think it depends on OS (SLES 10)!!!!to use the CPUs...