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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 302389953 by linuxpenguin on Tuesday 26th of January 2010 12:59:35 PM
Old 01-26-2010
I agree quite with pludi. But the thought sounds very interesting. What is more interesting is that all the commands that are run in the shell script have the same parent process id, so those commands would run in the same core (i could be wrong here). But if I am right, then it means that if you can detach your commands in your shell script from the parent then each of those commands could potentially execute in a different core. And now I wonder, if there could be a way to share states or variables across them. clearly "No", unless you implement shared memory in shell, that brings back the point 'Why use shell scripting for this task?'
 

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runon(1)						      General Commands Manual							  runon(1)

NAME
runon - Runs a command on a specific CPU or processor set SYNOPSIS
runon cpu_num command [argument...] runon -p [-x] pset_id command [argument...] runon -r rad_id command [argument...] DESCRIPTION
The runon utility runs the specified command (command) on the specified CPU (cpu_num), Processor Set (pset) or Resource Affinity Domain (RAD). The argument variable specifies any options or arguments for the specified command. All the threads created by the command inherit the CPU binding to the specified CPU (cpu_num), including threads created as the result of a fork. If the -p option is used, the specified command is bound to a processor set rather than to a specific processor. Because a processor set can contain more than one processor, the -p option is useful for multi-threaded applications. In addition, you can use the -x option to specify exclusive access to a processor set. OPTIONS
Binds to a processor set instead of a processor. You must specify the processor set identification number (pset_id), which is a unique integer that identifies the processor set and is returned by the pset_create command. You can specify the -x option with the -p option. Invokes Resource Affinity Domain (RAD) binding, which binds the command to a RAD identifier (rad_id) instead of an individual processor or pset. The RAD structure holds data associated with a NUMA building block. In this release, and for the purpose of using the runon command, a RAD is analogous to a hardware Quad Building Block or QBB. The hardware QBB identifier also identifies the RAD. However, in future releases a RAD will be defined as a related set of memory, pro- cessors, and I/O that might not map to a discrete QBB. Specifies exclusive use of a processor set. Use the -x option only with the -p option. SEE ALSO
Commands: pset_assign_cpu(1), pset_assign_pid(1), pset_create(1), pset_info(1), psradm(8) Files: processor_sets(4) Other: numa_intro(3) runon(1)
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