using multiple threads with multipler processors in CPLEX

[Ziming]

Hi,

 

I am solving a large number of problems in sequential orders using AMPL/CPLEX on a computer with multiple processors, and want to use multiple threads to speed up the process. I want the first thread to use dual simplex, the second one to use barrier and the third one to use primal simplex. I have used

 

option cplex_options ' threads=3';

 

but I wonder if I need to add in

 

option cplex_options 'concurrentopt' ;

and if using this directive makes the process faster. Thanks.

 

Regards

Ziming Guan

[Robert Fourer]

To use all available threads to run primal, dual, and barrier in CPLEX, stopping when the first one finds an optimal solution, specify

 

   option cplex_options 'concurrentopt';

 

This automatically uses 1 thread for primal, 1 thread for dual, and all remaining threads for barrier.  To restrict the number of threads used, specify

 

   option cplex_options 'concurrentopt threads=n';

 

where "n" is replaced by an integer.  This uses 1 thread for primal, 1 thread for dual, and n-2 threads for barrier.  (Thus setting n to 3 will use 1 thread for primal, for dual, and for barrier.)

 

Bob Fourer

am...@googlegroups.com

 

 

From: am...@googlegroups.com [mailto:am...@googlegroups.com]

On Behalf Of Ziming
Sent: Tuesday, July 9, 2013 5:47 PM
To: am...@googlegroups.com
Subject: [AMPL 7239] using multiple threads with multipler processors in CPLEX

[Ziming]

Thank you.

 

Regards,

Ziming Guan