linux-kernel - Re: How to increase maximum user cpu usage allowed on a multi core system?

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Message-ID: <20150317185033.GL18917@pd.tnic>
Date:	Tue, 17 Mar 2015 19:50:33 +0100
From:	Borislav Petkov <bp@...e.de>
To:	poma <pomidorabelisima@...il.com>
Cc:	Community support for Fedora users 
	<users@...ts.fedoraproject.org>,
	stan <stanl-fedorauser@...mail.net>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: How to increase maximum user cpu usage allowed on a multi core
 system?

On Tue, Mar 17, 2015 at 07:34:08PM +0100, poma wrote:
> On 09.03.2015 20:03, stan wrote:
> > I'm running Fedora 21 with a custom compiled kernel,
> > 3.19.0-1.20150211.fc21.x86_64.
> > 
> > I have a multi core system with 6 cores.  All are recognized by the
> > kernel.  
> > 
> > But, when I run a compile job with -j6, in order to allow all six cores
> > to be used, it limits the total amount of usage to 100% of a *single*
> > core.  So, it might use all six cores, but the sum of the percentages
> > on those six cores is always around 100% of one core.  This is from
> > htop output.

Let me try to understand this correctly?

You're building the kernel with

make -j6

but in htop you're seeing a single core at 100% and the rest are idle?
Yes, no?

What exact steps are you doing to build the kernel? Type them here
please so that I can do them exactly on my system too.

Also, please send a full dmesg from your system, private message is fine
too.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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