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Full Discussion: Newbie question
Top Forums Programming Newbie question Post 302203551 by spirtle on Monday 9th of June 2008 06:21:46 AM
Old 06-09-2008
Disclaimer: It's been a while since I have used parallel machines so I cannot remember details, but since nobody else has answered yet I'll have a go.

Now, your supercomputer might be set up differently, but every one I have ever used
uses a job submission system like PBS or NQS. You write a script with commands for the particular job submission system you are using (N.B. MPI is the parallel communications library, not a scripting language). You need to check whether this system allows you to subdivide a 32-node partition and run on each subdvision.

If this is impossible, and you cannot convince the admin to allow 16-node partitions, then you probably will have to change your program logic to run on 32-nodes, which means learning a little bit about parallel programming. Start by finding out where the magic number 16 comes from in your program, how the data is decomposed over the nodes, and then try to figure out how to generalise this for 32 (or any number) nodes.
 

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nqs2pbs(1B)								PBS							       nqs2pbs(1B)

NAME
nqs2pbs - convert NQS job scripts to PBS SYNOPSIS
nqs2pbs nqs_script [pbs_script] DESCRIPTION
This utility converts a existing NQS job script to work with PBS and NQS. The existing script is copied and PBS directives, #PBS , are inserted prior to each NQS directive #QSUB or #@$ , in the original script. Certain NQS date specification and options are not supported by PBS. A warning message will be displayed indicating the problem and the line of the script on which it occurred. If any unrecognizable NQS directives are encountered, an error message is displayed. The new PBS script will be deleted if any errors occur. OPERANDS
nqs_script Specifies the file name of the NQS script to convert. This file is not changed. pbs_script If specified, it is the name of the new PBS script. If not specified, the new file name is nqs_script.new . NOTES
Converting NQS date specifications to the PBS form may result in a warning message and an incompleted converted date. PBS does not support date specifications of "today", "tomorrow", or the name of the days of the week such as "Monday". If any of these are encountered in a script, the PBS specification will contain only the time portion of the NQS specification, i.e. #PBS -a hhmm[.ss]. It is suggested that you specify the execution time on the qsub command line rather than in the script. Note that PBS will interpret a time specification without a date in the following way: - If the time specified has not yet been reached, the job will become eligible to run at that time today. - If the specified time has already passed when the job is submitted, the job will become eligible to run at that time tomorrow. PBS does not support time zone identifiers. All times are taken as local time. SEE ALSO
qsub(1B) Local nqs2pbs(1B)
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