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

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On Tue, 17 Mar 2015 18:52:23 +0100
Heinz Diehl <htd+ml@xxxxxxxxxx> wrote:

> Lucky? The machine was fully unusable.

Yes, but you have full control of your machine.

> Yes, this machine is on F21.
> 
> [htd@chiara ~]$ uname -a
> Linux chiara.fritha.org 3.19.2-rc1-bfq #1 SMP PREEMPT Mon Mar 16
> 16:16:07 CET 2015 x86_64 x86_64 x86_64 GNU/Linux
> 
> It's a custom build kernel with two minor patches and the BFQ
> scheduler.

I have those same options enabled.
$ uname -a
Linux localhost.localdomain 4.0.0-0.rc3.git2.1.20150313.fc21.x86_64 #1
SMP PREEMPT Fri Mar 13 18:11:04 MST 2015 x86_64 x86_64 x86_64 GNU/Linux

> Directly from source.

I'm using the src.rpm from koji, 
http://koji.fedoraproject.org/koji/packageinfo?packageID=8
and rpmbuild to build the rpms, that I then install via yum -C

> This is the top output when compiling a kernel with -j8 (4 cores/8
> threads):
[snip] 
Nice.

> Can you reproduce this behaviour with a bog standard 3.19.x?

Because I'm using yum to manage kernels, I can't install a kernel older
than the latest I have on my system.  But when I was using the
stock 3.18 series of kernels, this behavior was there.

I might be able to download the stock version from the koji address
above, and use rpm --force to install it.
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