Originally posted by: Nicolas33

Hello,

I implemented a column generation script in OPL to solve the
Dantzig Wolfe decomposition of my problem.

My subproblem is separable, and so I have to compute independant subproblems.
Presently, my implementation is not parallel, subproblems are computed serially.

It is possible to compute several independant subproblems in the same time on different threads with OPL, under a main block?
Thanks for your help,

Nicolas
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Hi,

this is possible and you can find an example in opl\examples\opl_interfaces\java\ConcurrentProcessing
You cannot do that in a main block in OPL but you can thru OPL APIs

Regards
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#OPLusingCPLEXOptimizer

Originally posted by: Helia

Hi

I have the same question, but unfortunately I am new to object oriented programming and can't use the Java code referred by you. I want to know if the following is a feasible alternative:

1- Copy the OPL project

2-Open more than one OPL interface with different workspace names

3- Run the copy of the same OPL model with different data files on each OPL

 

I have tested once, it worked for a while then one of the OPL interfaces just stopped. Any idea?

 

Thank you 

Helia

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Hi,

if you do not like object oriented programming, you could use calls from python as in

https://www.ibm.com/developerworks/community/forums/html/topic?id=0b6cacbe-4dda-4da9-9282-f527c3464f47&ps=25

You can also use windows shell for that.

Let me give you an example.

Suppose you want to run in parallel the examples in

opl\examples\opl\warehouse

You can create a file call.bat

start oplrun scalableWarehouse.mod
start oplrun warehouse.mod warehouse.dat
start oplrun solpoolscript.mod

and then if in command line you do call.bat, the 3 examples will run in parallel

regards

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#OPLusingCPLEXOptimizer

Originally posted by: Helia

Hi

Thanks for your reply. It s not that I do not like object oriented programming, I m just new to it :)

following your suggestion, I have created a batch file but it is not working well. Probably because I do not know how to specify which configurations I want to run in parallel. The problems that I want to solve have only one model but multiple data file. So how can I indicate in the batch file that exactly which combination of model and data and setting file I want to run?

Thanks a lot for your insights

Best,

Helia

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Hi,

so on the .bat you should not use

oplrun [options] model-file [data-file ...]

as I did but
oplrun [options] -p project-dir [run-configuration ...]

regards

#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi,

so to go on with my .bat example in folder warehouse,

you could have in the .bat

start oplrun scalableWarehouse.mod
start oplrun warehouse.mod warehouse.dat
start oplrun solpoolscript.mod
start oplrun -p ../warehouse "Scalable data"

regards

#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: AMM1

hi alex,

actually i didnt get it .

Where to write these commands in the execute? i am using cp to solve vrpmtw,

should i write the configuration name or the my file .mod name?

also should i keep all the 48 .dat files in the project folder?

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No : you call oplrun from a .bat file : https://en.wikipedia.org/wiki/Batch_file

regards

 

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#OPLusingCPLEXOptimizer

Originally posted by: AMM1

Thank you for your reply

i tried to create batch

i have only one .mod and 2 data files for example

this didn't work , can you help me please

(i created the .bat from the notepad)

start oplrun vrp example.mod 
start oplrun data for rm 101.dat

start oplrun data for rm 102.dat
Start oplrun -p ../vrp example"Configuration2"

#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi,

do you use windows ?

What happens if you do

oplrun vrp example.mod 

in the command line ?

regards

#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: AMM1

Hi,

i got:

File "vrp" is not found.

 

 

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#OPLusingCPLEXOptimizer

If the name of you .mod is mod.mod and the name of your .dat is dat.dat then

oplrun mod.mod dat.dat

will make oplrun use your mod.mod and dat.dat

see https://www.ibm.com/support/knowledgecenter/en/SSSA5P_12.7.0/ilog.odms.ide.help/OPL_Studio/refoplrun/topics/oplrun_TOP.html

regards

 

#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi

see also https://www.ibm.com/developerworks/community/forums/html/topic?id=5358e11f-4501-4486-9c69-0d4d9019e12d&ps=25

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Originally posted by: Nicolas33

Thank you very much, it is very useful for me.
Best regards
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#OPLusingCPLEXOptimizer