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AIX
Sizing p7 systems
Post 302468631 by zaxxon on Wednesday 3rd of November 2010 11:21:07 AM
11-03-2010
Sizing p7 systems
Hi,
I am currently given the dubious task
to make an assumption on sizing our current p5 environment in relation to new p7 machines. Is there any kind of a vague factor how to calculate this?
I found some official IBM benchmark results with long lists of different Power machines and their scores but since I do not know the benchmarks themselves they were kinda useless for me.
Is there a simple kind of formula how to guess what number of p7 CPUs you might need to compensate a number of p5 CPUs?
Thanks in advance.
I am currently given the dubious task
to make an assumption on sizing our current p5 environment in relation to new p7 machines. Is there any kind of a vague factor how to calculate this?I found some official IBM benchmark results with long lists of different Power machines and their scores but since I do not know the benchmarks themselves they were kinda useless for me.
Is there a simple kind of formula how to guess what number of p7 CPUs you might need to compensate a number of p5 CPUs?
Thanks in advance.
Last edited by zaxxon; 11-04-2010 at 06:10 AM.. Reason: typo in subject
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LEARN ABOUT CENTOS
chcpu
CHCPU(8) User Manuals CHCPU(8) NAME
chcpu - configure CPUs SYNOPSIS
chcpu [-e] [-d] [-c] [-g] cpu-list chcpu [-p] mode chcpu -r chcpu [-h] [-V] DESCRIPTION
chcpu can modify the state of CPUs. It can enable or disable CPUs, scan for new CPUs, change the CPU dispatching mode of the underlying hypervisor, and request CPUs from the hypervisor (configure) or return CPUs to the hypervisor (deconfigure). Some options have a cpu-list argument. Use this argument to specify a comma-separated list of CPUs. The list can contain individual CPU addresses or ranges of addresses. For example, 0,5,7,9-11 makes the command applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and 11. OPTIONS
-r, --rescan Trigger a rescan of CPUs. Use this option on systems that do not automatically detect newly attached CPUs. The Linux kernel then recognizes the new CPUs. -c, --configure cpu-list Configure all specified CPUs. Configuring a CPU means that the hypervisor takes a CPU from the CPU pool and assigns it to the vir- tual hardware on which your kernel runs. -e, --enable cpu-list Enable all specified CPUs. Enabling a CPU means that the kernel sets it online. A CPU must be configured, see -c, before it can be enabled. -p, --dispatch mode Set the CPU dispatching mode (polarization). This option has an effect only if your hardware architecture and hypervisor support CPU polarization. Available modes are: horizontal The workload is spread across all available CPUs. vertical The workload is concentrated on few CPUs. -d, --disable cpu-list Disable all specified CPUs. Disabling a CPU means that the kernel sets it offline. -g, --deconfigure cpu-list Deconfigure all specified CPUs. Deconfiguring a CPU means that the hypervisor removes the CPU from the virtual hardware on which the Linux instance runs and returns it to the CPU pool. A CPU must be offline, see -d, before it can be deconfigured. -h, --help Display help information and exit. -V, --version Display version information and exit. AUTHOR
Heiko Carstens <heiko.carstens@de.ibm.com> COPYRIGHT
Copyright IBM Corp. 2011 SEE ALSO
lscpu(1) AVAILABILITY
The chcpu command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util- linux/>. Linux June 2012 CHCPU(8)