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Top Forums UNIX for Dummies Questions & Answers Query on Running Multiple processes in background Post 302456591 by Corona688 on Friday 24th of September 2010 04:36:27 PM
Old 09-24-2010
Quote:
Originally Posted by gpta_varun
Thanks for the reply vbe !

But before I dwell further ,
I have some queries:

In case I run multiple processes from a script ,
1) Are all the processes allocated to a single CPU or multiple CPU ?
2) Can there be a possibility that a lot of time is wasted in scheduling the processes , allocated to single CPU?

3) In case of a fork() , are the child processes allocated to multiple CPUs for execution ? If not , can we do so ?
How should we know? We don't even know what OS is running on your server. This is important. Some have programmable restrictions in the number of CPU's it will let a user monopolize simultaneously.

Assuming there's not some sort of restrictions in place, multiple processes will run on multiple cores. But you know what they say about assumptions.

I don't see a lot of point running umpteen instances of RCP in parallel. The transfer's probably not CPU-bound, more likely being bottlenecked by disk or network, so more cores won't help. You'd have 9 transfers at X/9 MBPS instead of one transfer at X MBPS.
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
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