[Beowulf] frequency scaling
seth at integratedsolutions.org
Mon Sep 21 16:32:08 PDT 2015
From: Beowulf [mailto:beowulf-bounces at beowulf.org] On Behalf Of
Sent: Monday, September 21, 2015 5:07 PM
To: beowulf at beowulf.org
Subject: Re: [Beowulf] frequency scaling
On 21/09/15 23:18, Mahmood Sayed wrote:
> Nuke it from the bios. It's the only way to be sure.
Actually it's not as the kernel intel_idle driver will ignore your
or UEFI settings and try and save power anyway..
as part of our kernel boot options, originally found here some
Best of luck!
Actually we use a different method:
On one machine run
analyzing CPU 0:
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software:
maximum transition latency: 5.0 us.
hardware limits: 1.40 GHz - 2.60 GHz
available frequency steps: 2.60 GHz, 1.40 GHz
available cpufreq governors: conservative, userspace, powersave,
current policy: frequency should be within 2.60 GHz and 2.60
The governor "performance" may decide which
speed to use
within this range.
current CPU frequency is 2.60 GHz (asserted by call to
boost state support:
Boost States: 2
Total States: 7
Pstate-Pb0: 3200MHz (boost state)
Pstate-Pb1: 2900MHz (boost state)
The above is the result after using the command:
cpupower frequency-set -d 2600MHz -g performance
The package is cpupowerutils.
You can put this into your start up file like rc.local or a login
file that runs when a user logs in (with su or sudo if needed).
This allows us to use the built-in cpu frequency control (OS and
BIOS) and set the processor to its maximum standard speed while
still making the boost speeds available if they are needed due to
load (limited by temperature or power). You can change the lowest
speed ( -d speed ) to match your power and performance
This processor happens to be a single AMD 6212 in a compute node
in an RDO cloud with a standard freq of 2600MHz and a boost speed
of 3200MHz running CentOS 7.1.
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