Thomas Leveringhaus

Hi Jaromił, thanks for your reply.I already assumed that GRBaddconstr() isn't thread-safe.But as you said, that's not really a problem because I can create the arguments for the function call in pa...

Hi Jaromił, thanks again for your continuous support. I am in a(nother) testing phase of my work and it is not an actual problem to reduce the problem size for examples.I already reduced the size b...

Hi Gurobot (AI-generated response), thanks for your reply. In the meantime, I have familiarized myself with the C-API in more detail and understand how CSR & CSC are used here. With regard to the P...

Hello Jaromił, thanks for your helpful answer. I can work with the limit on the number of variables at the moment by doing some variable eliminations myself, which I would have preferred to leave t...

Thank you David!

Hi David, thank you for your answer: Then it is a feature not a bug ;-) But that is a pity for me, because I can't save the new found solution to file during optimization. Is there a special reaso...

Or maybe Callbacks are called from alle ConcurrentMIP-Instances but maybe identifying "if where == GRB.Callback.MIPSOL" doesn't work properly in different instances?

Hi David, I have a callback-function like this (in python): def writesolution_callback(model, where):    if where == GRB.Callback.MIPSOL: [...] # processing of the solution and creation of t...

Hi David, I redeveloped/improved my optimization modell. In the past I saw improvements with the heuristic, but actually gurobi does not even start the heuristic although I set PartitionPlace to 31...

Thanks, that works :-)