Is there a way to make bash [or another shell] use all CPU cores to execute a single script? Post: 302389944

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Top Forums Shell Programming and Scripting Is there a way to make bash [or another shell] use all CPU cores to execute a single script? Post 302389944 by pludi on Tuesday 26th of January 2010 12:34:20 PM

01-26-2010

Registered User

If you want to benchmark a system, use a language with less run-time overhead like C, especially if you're just burning CPU.

As for your question: no, shells don't do multi-thread by themselves (I'm assuming you mean "shells" not "OS", since most OS use all cores anyways). Why should they. A shell is designed to interact with a user who (more or less) knows what he/she does. That they're scriptable is a nice value-adding feature.

Besides, how should the shell divine what parts of your program can run in parallel and which can't? What variables should be shared across threads? How should it avoid deadlocks? That stuff has (as of yet) to be considered by a programmer, and those can usually handle backgrounded subshells and a wait call or two.

P.S.: There is no such thing as an "overloaded CPU". A CPU can be in (almost) any state between "idle" and "completely utilized", but that's it.

pludi

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shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
       /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)