Decision Optimization

I have a very large model with 10-15M of variables and 10-15M of constraints and I need to run few iterations with some minimal changes in the model. I cache old variables and constraints so I can use in the next iteration. After each iteration finish I used to clear model by Cplex.ClearModel() function, but Cplex.ClearModel() has performance penalty in term of time taken So I want to use Cplex.EndModel(). But in some instances, in the next iteration Cplex throwing below errors when i use Cplex.EndModel() and application is terminated immediately.

"System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.' "
"Description: The process was terminated due to an unhandled exception. Exception Info: System.AccessViolationException"

I use Cplex 12.6 .NET Conert technology.

Is there any way i can use Cplex.EndModel() to clear my model objects instead of Cplex.ClearModel() as it is taking few minutes which i can't afford.

I found below document in IBM site:


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ORE2021
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#DecisionOptimization

You have to upgrade your CPLEX Studio version: 12.6 is so old and not supported anymore.
Many bug fixes went into the releases: there may very well be a bug in the .NET for 12.6.x release.

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Vincent Beraudier
------------------------------

Original Message:
Sent: Tue October 05, 2021 07:12 AM
From: ORE2021
Subject: CPLEX ClearModel() vs EndModel()

I have a very large model with 10-15M of variables and 10-15M of constraints and I need to run few iterations with some minimal changes in the model. I cache old variables and constraints so I can use in the next iteration. After each iteration finish I used to clear model by Cplex.ClearModel() function, but Cplex.ClearModel() has performance penalty in term of time taken So I want to use Cplex.EndModel(). But in some instances, in the next iteration Cplex throwing below errors when i use Cplex.EndModel() and application is terminated immediately.

"System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.' "
"Description: The process was terminated due to an unhandled exception. Exception Info: System.AccessViolationException"

I use Cplex 12.6 .NET Conert technology.

Is there any way i can use Cplex.EndModel() to clear my model objects instead of Cplex.ClearModel() as it is taking few minutes which i can't afford.

I found below document in IBM site:


------------------------------
ORE2021
------------------------------

#DecisionOptimization

Note that EndModel is ending all the CPLEX content, that is also the variables.

------------------------------
Vincent Beraudier
------------------------------

Original Message:
Sent: Thu October 14, 2021 05:43 AM
From: Vincent Beraudier
Subject: CPLEX ClearModel() vs EndModel()

You have to upgrade your CPLEX Studio version: 12.6 is so old and not supported anymore.
Many bug fixes went into the releases: there may very well be a bug in the .NET for 12.6.x release.

------------------------------
Vincent Beraudier

Original Message:
Sent: Tue October 05, 2021 07:12 AM
From: ORE2021
Subject: CPLEX ClearModel() vs EndModel()

I have a very large model with 10-15M of variables and 10-15M of constraints and I need to run few iterations with some minimal changes in the model. I cache old variables and constraints so I can use in the next iteration. After each iteration finish I used to clear model by Cplex.ClearModel() function, but Cplex.ClearModel() has performance penalty in term of time taken So I want to use Cplex.EndModel(). But in some instances, in the next iteration Cplex throwing below errors when i use Cplex.EndModel() and application is terminated immediately.

"System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.' "
"Description: The process was terminated due to an unhandled exception. Exception Info: System.AccessViolationException"

I use Cplex 12.6 .NET Conert technology.

Is there any way i can use Cplex.EndModel() to clear my model objects instead of Cplex.ClearModel() as it is taking few minutes which i can't afford.

I found below document in IBM site:


------------------------------
ORE2021
------------------------------

#DecisionOptimization