writing a simple script to get total number of cpus/cores in server
Hi,
I am very new to scripting and I wanted to write a unix shell script which can give me,
1)number of cpu's in a box
2)number of cores per cpu
3)total number of cores in abox (ie multiplying 1&2)
I am also trying to figure out how to check if hyper-threading is enabled in the server and also this check to script.
intially I am looking this to run on linux then wanted to implement it on other flavours of unix.
below is my script..
Code:
#!/bin/sh
if [ ! -r /proc/cpuinfo ]; then
echo "Is this Linux? Cannot find or read /proc/cpuinfo"
exit 1
fi
echo num_cpus = `grep 'physical id' /proc/cpuinfo | sort -u | wc -l`
read num_cpu
echo num_cores_per_cpu=`grep 'core id' /proc/cpuinfo | sort -u | wc -l`
read num_cores_per_cpu
echo total_cores=`expr $num_cpus \\* num_cores_per_cpu` --this part is not working..
if [ $num_cores -eq 0 ]; then
# this box is either an old SMP or single-CPU box, so count the # of processors
echo num_cores=`grep '^processor' /proc/cpuinfo | sort -u | wc -l`
fi
#echo $num_cores_per_cpu
any help is much appreciated.
thanks,
Steve.
Moderator's Comments:
How to use code tags when posting data and code samples.
Last edited by Franklin52; 01-19-2012 at 03:24 PM..
Reason: Please use code tags for data and code samples, thank you
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LEARN ABOUT OSX
core
CORE(5) BSD File Formats Manual CORE(5)NAME
core -- memory image file format
SYNOPSIS
#include <sys/param.h>
DESCRIPTION
A small number of signals which cause abnormal termination of a process also cause a record of the process's in-core state to be written to
disk for later examination by one of the available debuggers. (See sigaction(2).) This memory image is written to a file named by default
core.pid, where pid is the process ID of the process, in the /cores directory, provided the terminated process had write permission in the
directory, and the directory existed.
The maximum size of a core file is limited by setrlimit(2). Files which would be larger than the limit are not created.
The core file consists of the Mach-O(5) header as described in the <mach-o/loader.h> file. The remainder of the core file consists of vari-
ous sections described in the Mach-O(5) header.
NOTE
Core dumps are disabled by default under Darwin/Mac OS X. To re-enable core dumps, a privileged user must do one of the following
* Edit /etc/launchd.conf or $HOME/.launchd.conf and add a line specifying the limit limit core unlimited
* A privileged user can also enable cores with launchctl limit core unlimited
* A privileged user can also enable core files by using ulimit(1) or limit(1) depending upon the shell.
SEE ALSO gdb(1), setrlimit(2), sigaction(2), Mach-O(5), launchd.conf(5), launchd.plist(5), sysctl(8)HISTORY
A core file format appeared in Version 6 AT&T UNIX.
BSD June 26, 2008 BSD
01-19-2012
