[solved] multi core scheduler

nTia89 · 2012-04-09 10:40:50

hi to everybody,

try cpupower, i noticed that the command cpupower info return:

[mattia@arch-desktop ~]$ sudo cpupower info
System's multi core scheduler setting: not supported
System's thread sibling scheduler setting: not supported
System does not support Intel's performance bias setting
analisi della CPU 0:

because i have a dual-core processor (opteron 175) why the multi-core scheduler isn't supported ?

thanks in advance

Last edited by nTia89 (2012-04-21 17:18:25)

nTia89 · 2012-04-20 15:33:13

uppp

brebs · 2012-04-20 20:49:40

It's a kernel option:

$ zgrep SCHED_MC /proc/config.gz

nTia89 · 2012-04-20 20:51:05

infact, why cpupower tell me that isn't supported ???

graysky · 2012-04-20 22:42:13

Because your chip does not support it. Get a more modern chip.

$ sudo cpupower info
System's multi core scheduler setting: not supported
System's thread sibling scheduler setting: not supported
System does not support Intel's performance bias setting
analyzing CPU 0:

$ grep "model name" /proc/cpuinfo 
model name	: Intel(R) Xeon(R) CPU           X3360  @ 2.83GHz
model name	: Intel(R) Xeon(R) CPU           X3360  @ 2.83GHz
model name	: Intel(R) Xeon(R) CPU           X3360  @ 2.83GHz
model name	: Intel(R) Xeon(R) CPU           X3360  @ 2.83GHz

Compare to:

$ sudo cpupower info
System's multi core scheduler setting: 1
System's thread sibling scheduler setting: 1
analyzing CPU 0:
Could not read perf-bias value

$ grep "model name" /proc/cpuinfo 
model name	: Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz
model name	: Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz
model name	: Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz
model name	: Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz

Last edited by graysky (2012-04-20 22:46:28)

nTia89 · 2012-04-21 07:45:32

why isn't supported my cpu ?

on what mc sched is supported ?

bernarcher · 2012-04-21 12:40:43

nTia89, to understand what happens you need to get more accustomed to the CPU models and their capabilities. This is part of your homework, you surely know.

This thread is probably TGN and will be moved there if your questions remain on the current uninformed level.

nTia89 · 2012-04-21 13:14:40

i'm not a total noob, i try with google and kernel official documentation but the best i've found is that multicore scheduler should be selected if you have a dual-core CPU or that multicore scheduler is an hardware feature.....

so every CPU with more than one core should use it

where i err ?

graysky · 2012-04-21 13:30:40

multicore scheduler != `sudo cpupower info`

It is confusing terminology used by the cpupower.

Try:

$ sudo cpupower monitor
    |Mperf               
CPU | C0   | Cx   | Freq 
   0|******|******|******
   2|******|******|******
   3|******|******|******
   1|******|******|******

I'll bet you see two cores.

Last edited by graysky (2012-04-21 13:32:34)

nTia89 · 2012-04-21 14:25:38

output:

[mattia@arch-desktop ~]$ sudo cpupower monitor
No HW Cstate monitors found

what do you mean with:

multicore scheduler != `sudo cpupower info`

???

graysky · 2012-04-21 16:11:21

That means that the output of the command does not equal the kernel setting. They are called the same but are different. It is confusing. Does htop show two cores?

nTia89 · 2012-04-21 16:19:04

graysky wrote:

That means that the output of the command does not equal the kernel setting. They are called the same but are different. It is confusing. Does htop show two cores?

ah, ok

yes, htop show me two core

so, if i see two core multicore scheduler is active ???

graysky · 2012-04-21 16:42:06

Yes. Your chip does not support some advanced power saving settings that cpupower uses, that's all the output of the command is telling you.

Last edited by graysky (2012-04-21 16:43:12)

nTia89 · 2012-04-21 17:18:12

you have been precise !

thanks and SOLVED

Last edited by nTia89 (2012-04-21 17:18:39)

Arch Linux

#1 2012-04-09 10:40:50

[solved] multi core scheduler

#2 2012-04-20 15:33:13

Re: [solved] multi core scheduler

#3 2012-04-20 20:49:40

Re: [solved] multi core scheduler

#4 2012-04-20 20:51:05

Re: [solved] multi core scheduler

#5 2012-04-20 22:42:13

Re: [solved] multi core scheduler

#6 2012-04-21 07:45:32

Re: [solved] multi core scheduler

#7 2012-04-21 12:40:43

Re: [solved] multi core scheduler

#8 2012-04-21 13:14:40

Re: [solved] multi core scheduler

#9 2012-04-21 13:30:40

Re: [solved] multi core scheduler

#10 2012-04-21 14:25:38

Re: [solved] multi core scheduler

#11 2012-04-21 16:11:21

Re: [solved] multi core scheduler

#12 2012-04-21 16:19:04

Re: [solved] multi core scheduler

#13 2012-04-21 16:42:06

Re: [solved] multi core scheduler

#14 2012-04-21 17:18:12

Re: [solved] multi core scheduler

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