CPLEX Error 1001: Out of memory

Question

Hi

I was trying to solve an LP with CPLEX. It throws an exception "CPLEX Error 1001: Out of memory" when I am building the model. Please note that I am getting this error while modelling and not while optimizing. There are google results for Out of memory scenarios during optimization.

Your help is highly appreciated

Thanks

Answer 1

There's very little information to work with here... does the problem occur for small LPs? How big of an LP are you building? Have you seen this ILOG forum thread?

Answer 2

Thank you very much for the response. The issue is temporarily solved.

I was running the optimizer on a server with 8G ram (3G free) and the model was huge. We have been starting JRE with Min Heap size ( java -Xms1G ) set to 1G. I believe this caused JRE to reserve a lot of space in the server memory; leaving no room for the CPLEX process.

After numerous trial and error experiments with different CPLEX parameters (all of them failed!), we attempted start the optimizer with java -Xms512M -Xmx750M and it worked!!!