Message-ID: <03c501c5df2c$9a19e2f0$0400a8c0@dcccs>
From: "JaniD++" <djani22@dynamicweb.hu>
To: "Paul Jackson" <pj@sgi.com>
Cc: <linux-kernel@vger.kernel.org>
References: <035101c5df17$223eccb0$0400a8c0@dcccs> <20051101123648.5743a5cf.pj@sgi.com>
Subject: Re: cpuset - question
Date: Tue, 1 Nov 2005 22:38:28 +0100
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Hello,

----- Original Message ----- 
From: "Paul Jackson" <pj@sgi.com>
To: "JaniD++" <djani22@dynamicweb.hu>
Cc: <linux-kernel@vger.kernel.org>
Sent: Tuesday, November 01, 2005 9:36 PM
Subject: Re: cpuset - question


> JaniD++ wrote:
> > [root@dy-xeon-1 cpus_0]# /bin/echo 1 > mems
> > /bin/echo: write error: Numerical result out of range
> > [root@dy-xeon-1 cpus_0]# echo 1 >mems
> > [root@dy-xeon-1 cpus_0]# cat mems
> >
> > [root@dy-xeon-1 cpus_0]# /bin/echo $$ > tasks
> > /bin/echo: write error: No space left on device
>
> I'm guessing you are on a multi-processor, with a single
> memory node, not a NUMA system with multiple memory nodes.
>
> Or, at least, your kernel was compiled for that (with the
> CONFIG_NUMA option disabled).

Yes, this option is disabled.
This is a dual-xeon server with HT.
With HT looks 4 CPU.

In this config i need NUMA option enabled to use cpusets?

I only need to move my 4 gnbd-client process to 4 cpuset, but i don't want
to touch the memory.
This is possible, or need the CONFIG_NUMA=y option?

Thanks

Janos

>
> The first echo above failed because you tried to set bit 1
> in mems, but only bit 0 is valid (only one memory node).
>
> The second echo failed too, but your shells (like most
> shells) builtin echo didn't display the error.
>
> The 'cat mems' command showed that mems was not yet set,
> which is indeed the case.
>
> The third and final echo above, into 'tasks' failed because
> you can't attach a task to a cpuset that has no memory specified.
>
> If you had done '/bin/echo 0 > mems', it would have worked
> much better.
>
> -- 
>                   I won't rest till it's the best ...
>                   Programmer, Linux Scalability
>                   Paul Jackson <pj@sgi.com> 1.925.600.0401
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