10-15-2008
Dummy question about /proc/cpuinfo
Perhaps this is a very dummy question but sorry I don't know other place to do it. We just buy a new cluster of Xeon machines but there is something I don't understand and perhaps someone can help me.
The more /proc/cpuinfo produces the following output (just part of it).
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz
stepping : 6
cpu MHz : 1998.000
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
I revise the E5420 specifications and it says that it has 12MB of cache, however only 6MB are reported in the cpuinfo. Can someone help me
to understand this?
Thank you in advance.
Jorge
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LEARN ABOUT DEBIAN
sys::statistics::linux::sysinfo
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)