Investigate state solver session

As an end user, you cannot directly inspect the data used by the data session or by the solver session. As a model builder, you may need to investigate in detail what happens during these sessions.

One way is by creating a data snapshot by creating case files or text files. This article shows how to do this with text files.


  1. Download the example project: ../310/model/ (Also used in Investigate Behavior of AIMMS PRO Job.)

  2. Copy the library Library GuardServerSession.

  3. Add the library to your project using the AIMMS Library Manager.

Using the library

The library Library GuardServerSession, includes the procedure gss::pr_SaveState with two arguments:

  1. sp_Label The value of this string parameter is used as the folder name; this folder name is referred to as the output folder below.

  2. s_SelectedIdentifiers This is a subset of AllSymbols. For each identifier that contains data, a corresponding file is created in the output folder, containing one element per line.


If your app is running on an AIMMS PRO platform, or if it has a connection to an AIMMS PRO platform, the files created will also be copied to AIMMS PRO storage, as a subfolder of /Userdata/<env>/<userName>/<appName>/<appVersion>.

An example call is:

2    sp_Label              :  "ThirdSaveLabel",
3    s_SelectedIdentifiers :  Superfluous_Data);