GRBModel.Dispose() take too much time

[Ying Zhang]

Hello,

Now I use Gurobi (in C#.NET) to solve a larger scale MIP.

I set the time limit to 1800 seconds. When the time is up, via Windows Task Manager, I see that my Physical Memory is taken 98%,

Then after the method model.Optimize() is executed, I use model.Dispose() to release the resources.

But this single line needs more than 10 minutes!!

model.Dispose();

What I mean is that, Gurobi need more than 10 minuted to release all the resources! Via task manager, I see that the memory my program takes decrease from 98% to 0 very slowly.

How could this happern? I was expected the Dispose() method to implement rather fast.

How to fix this? Thank you.

[Greg Glockner]

Sounds like your computer is low on physical memory, so it is using virtual memory.

[Ying Zhang]

Dear Greg,

Thanks, so it seems that the program uses virtual memory automatically. Is there some methods to turn that off? If the physical memory is insufficient, can I write some nodes of the B&B tree to the local hard disk?

 If it does use virtual memory, so it will take so much time to release all the resources?

[Renan Garcia]

Please read FAQ 32 at http://www.gurobi.com/support/faqs#CHS for guidance on how to minimize Gurobi's memory footprint (i.e., physical and virtual). In particular, you can write B&B nodes to disk with the NodefileStart parameter (see http://www.gurobi.com/documentation/6.0/refman/nodefilestart.html). You might also consider reducing the Threads parameter (see http://www.gurobi.com/documentation/6.0/refman/threads.html).

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