What types of problems can I solve?

You can solve CPLEX problems by uploading an LP file, an SAV file, or an MPS file. Any of these can be accompanied by a PRM file for settings or a FEASIBILITY file to invoke FeasOpt or the conflict refiner. MPS files can be accompanied by SOL or MST files to enable CPLEX warm start. You can also compress your file(s) as a BZ2 or a GZIP file.

You can solve a CP Optimizer problem by uploading a CPO file. The CPO file can contain parameters for solving the problem. You cannot compress a CPO problem file at this time.

You can solve OPL-CPLEX and OPL-CPO problems by

  • uploading a MOD file with optional JSON file(s) and/or zero or more DAT file(s)and/or zero or more Excel files.
  • uploading an OPLPROJECT file with a default run configuration, one or more MOD file(s), zero or more DAT file(s), and an optional OPS file.
An OPL project can have only one default run configuration.

You can solve DOcplex problems by uploading one or more PY files. These files may be accompanied by zero or more data files of any format.

All files must be in the same root directory; uploads containing multiple directories are not supported. Problem files cannot connect to an external data source. You cannot drag and drop files directly from an archive viewer into the DropSolve interface. All files must be dropped on the DropSolve interface simultaneously.

How does the solve process work?

The total processing time limit for a trial user is 60 minutes. If a problem runs over 60 minutes, the best incumbent solution at that time is returned. The optimization engine is chosen based on file type for LP and MPS files or based on the declaration in the MOD file.

What does it mean if my problem is "Pending"?

If a problem shows as "Pending" for some time, this means the problem is in a queue and will be solved when the server is available.

Is there a limit on the size of file I can upload?

The maximum size for a file uploaded through the DropSolve interface is 500MB.

How can I access and interpret the results?

The results are written to a text file that you can download. The results include the decision variable values, post-processing structures, and decision expressions. For CPLEX problems, the results are in XML format. For CPO problems, the results are in JSON format. For OPL problems, the results format depends on the input format. For more information, see OPL model input and output on the Decision Optimization Developer Center.

How can I keep track of my usage?

You can see details of your use of Decision Optimization on Cloud services on the Usage History page. This page provides details of your usage per month and per subscription (for example, free trial or paid plan). You must be logged in to see this page.

What happens if I close my browser window?

If your files are being uploaded when you close your browser, you delete the problem. You can close the browser window while the solve is running or pending, then return at a later time. The DropSolve page keeps a history of your last five solves. Once you have launched five solves, you need to delete one in order to start a new one.

Which web browsers support DropSolve?

DropSolve has been tested with the following web browsers:

  • MS Internet Explorer 10, 11
  • Mozilla FireFox 32
  • Google Chrome 37

How can I get support?

To request more information or support, you can send us an e-mail. If you need help on a specific problem, be sure to include the problem's job ID, which you can find in the Info tab of the DropSolve interface.
You can also visit our dW Answers forum to ask a question or read questions from other users.