Posted Fri, 22 Mar 2024 11:38:20 GMT by Rachit Soni UNiMORE
I am getting 'unspecified error' message when running multiple simulations. I have to change boundary conditions in every simulations and then delete them after extracting results in each simulation . I have to perform 10000 such simulation. But after running some simulation it's getting stuck and then giving error message 'unspecified error'.  I am using 'SAMG' equation system solver. Number of threads for matrix assembly as single threaded. Number of threads for matrix solving as default. The another problem I am facing is computational time. It's taking a lot of computational time to solve a single simulation( approximately 5-10 minutes or sometimes more). How can I increase the computational speed? when I am using PETSc_ksp it's giving another error : Attempting to use an MPI routine after finalizing MPICH.
Posted Wed, 03 Apr 2024 14:38:42 GMT by Carlos Andres Rivera Villarreyes Global Product Specialist - FEFLOW
Hi Rachit, To understand better the case, can you elaborate how you are launching the 1000's simulations? Is this done under the FePEST framework? Or are you using your own script to do the job? The issue with the MPI can be related to several things, for example, you already have an MPI environment in place, which could conflict with FEFLOW's one. Or the script is not properly terminating the MPI instance. Best regards Carlos Rivera
Posted Wed, 03 Apr 2024 15:14:09 GMT by Rachit Soni UNiMORE
Thank you for replying. To elaborate further, I will say I am not using Fepest. I have written a script , in which i am producing a stage variation time series for each rainfall event from 1 hour to 48 hours for a return period of 100 years. I am using IDF curves and rating curves for this. Then I am adding these to the model in my script and running the simulation. I am performing feflow simulation for 3 days. It's taking a lot of time and causing errors, as explained previously. In fact, I am only changing the boundary condition in each simulation. But still, it's very slow to perform these many simulations. What can i do? 

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