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Top Forums UNIX for Dummies Questions & Answers Definition of "siblings" in /proc/cpuinfo Post 302381958 by treesloth on Monday 21st of December 2009 02:37:51 PM
Old 12-21-2009
Definition of "siblings" in /proc/cpuinfo

So, I'm looking over /proc/cpuinfo and have a question... I've read that "siblings" refers to hyperthreading, but that seems odd considering the contents of cpuinfo. Here's a part:

Code:
model name      : Intel(R) Xeon(R) CPU           E5410  @ 2.33GHz
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4

That almost seems to say that the CPU is a quad-core Xeon (which is correct) as well as being hyperthreaded-- each core having 4 hyperthreads. That seems wrong, though. It seems more likely that it's saying that the CPU has 4 cores and 4 hyperthreads total-- that is, depending on how one looks at it, one hyperthread per core, or, alternatively, 4 cores and no hyperthreading. Four hyperthreads per core would instead be:

Code:
siblings        : 4
cpu cores       : 16

Am I understanding this correctly? For that matter, is there a definitive publication about this? I've looked for it, and will continue, but no luck so far...
 

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Sys::Statistics::Linux::SysInfo(3pm)			User Contributed Perl Documentation		      Sys::Statistics::Linux::SysInfo(3pm)

NAME
Sys::Statistics::Linux::SysInfo - Collect linux system information. SYNOPSIS
use Sys::Statistics::Linux::SysInfo; my $lxs = Sys::Statistics::Linux::SysInfo->new; my $info = $lxs->get; DESCRIPTION
Sys::Statistics::Linux::SysInfo gathers system information from the virtual /proc filesystem (procfs). For more information read the documentation of the front-end module Sys::Statistics::Linux. SYSTEM INFOMATIONS
Generated by /proc/sys/kernel/{hostname,domainname,ostype,osrelease,version} and /proc/cpuinfo, /proc/meminfo, /proc/uptime, /proc/net/dev. hostname - The host name. domain - The host domain name. kernel - The kernel name. release - The kernel release. version - The kernel version. memtotal - The total size of memory. swaptotal - The total size of swap space. uptime - The uptime of the system. idletime - The idle time of the system. pcpucount - The total number of physical CPUs. tcpucount - The total number of CPUs (cores, hyper threading). interfaces - The interfaces of the system. arch - The machine hardware name (uname -m). # countcpus is the same like tcpucount countcpus - The total (maybe logical) number of CPUs. "pcpucount" and "tcpucount" are really easy to understand. Both values are collected from "/proc/cpuinfo". "pcpucount" is the number of physical CPUs, counted by "physical id". "tcpucount" is just the total number counted by "processor". If you want to get "uptime" and "idletime" as raw value you can set $Sys::Statistics::Linux::SysInfo::RAWTIME = 1; # or with Sys::Statistics::Linux::SysInfo->new(rawtime => 1) METHODS
new() Call "new()" to create a new object. my $lxs = Sys::Statistics::Linux::SysInfo->new; get() Call "get()" to get the statistics. "get()" returns the statistics as a hash reference. my $info = $lxs->get; EXPORTS
No exports. SEE ALSO
proc(5) REPORTING BUGS
Please report all bugs to <jschulz.cpan(at)bloonix.de>. AUTHOR
Jonny Schulz <jschulz.cpan(at)bloonix.de>. COPYRIGHT
Copyright (c) 2006, 2007 by Jonny Schulz. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-03-09 Sys::Statistics::Linux::SysInfo(3pm)
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