Hi, First of all thank you for developing this amazing library! It’s quite something to be able to couple code for FSI and have simulations running in a matter of weeks! I am using preCICE to couple an in-house finite-volume immersed boundary method code called Lotus, (written in Fortran) to Calcu…

@marinlauber we recenly released the adapter v2.19.0, which also fixed a few memory leaks. Could you please check if this improved the situation for you and report back? We are also looking for a case to reproduce the issue, so if you manage to make a tutorial case trigger this, it would help a lot…

Could you provide some more information on which version numbers of preCICE and Calculix you are using and maybe also if you have build preCICE yourself and how (which options) if applicable?! About what size of memory, mesh points and length of simulation are we talking here?

Hi @marinlauber , [image] marinlauber: When running the simulations, the memory usage gradually increases up to the point where all my available memory is used (this takes a while but my simulations run for a while). This is not a problem with our in-house code, as running the rigid-body version…

@ajaust @IshaanDesai I am using preCICE version 2.2.0 (from a package distribution not from source, I am using Ubuntu 18.04) and CalculiX 2.16. I compiled the preCICE adapter as described on the github repo. These size of the simulation is not so big, I am using a rectilinear grid with 256x128x128…

Sorry for the late reply. I wonder whether you could identify which participant of your coupled simulation requires the vast amount of memory. Is it Calculix or Lotus which uses most of the 44 GB? Maybe we also have to check back with the preCICE developers on how to debug that. In the issue on Git…

@marinlauber sorry for the late reply, was quite busy over the past few days. You explicitly say that the total memory usage remains around 5GB if you only run the fluid simulation. Here do you mean you run a single-physics test case for the fluid simulation which has no coupling whatsoever? If that…

Thanks for your reply. Yes, I run a single-physics test case with the exact same set-up as the coupled simulation. I can do the same with CalculiX only (single-physics) and the memory usage is stable. I am relatively confident the leak/accumulation is from the adapter itself. I already supplied th…

Okay then it is very likely that the memory leak is coming from the CalculiX-Adapter itself. Sorry for the double request of the config file, in any case everything seems to be okay there. Can you try to do uni-directional coupling of your setup in two stages to narrow down the leak? Meaning, in o…

Hi @Makis ! Sorry for the late reply. So in the meantime I re-installed everything, and also installed some packaged from source and that made the problem disappeared. This was using ccx_2.16. I have since then updated Ubuntu to 20.04 and I have installed everything again on this distribution, but…

Large memory usage while running

Using preCICE

Makis July 14, 2021, 8:31am 9

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Large memory usage while running

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