TMP folders name convention

[suparat4]

Hi ,

In our test infrastructure , we are running the tests in parallel using the pytest-xdist Python package. Currently, we have 4 workers on a Windows agent and 2 on Linux. When tests run in parallel, the fmusim process might start multiple times simultaneously.

fmusim creates a folder in the C:\Users\USERNAME\AppData\Local\Temp directory on Windows (and a similar location on Linux) and extracts the vECU.fmu to this folder. The folder name is defined by fmusim and includes just some number ( Ex: 123, 124 ,125 etc.) After the simulation completes successfully, fmusim deletes the folder.

Unfortunately, the folder naming convention used by fmusim leads to collisions during parallel execution. The folder name becomes a shared resource for multiple fmusim processes started simultaneously.

It is possible to have some more random naming convention for this TMP folder ? One proposal can be to use UUID on creating the name of tmp folder ( maybe cut to only a specific number of characters, like 6)

Version used : 0.0.36
Examples of TMP folder names while running tests in paralel mode , having 10 workers:

[t-sommer]

Can you give #634 a try?

[suparat4]

Thank you for the fix . Looks good for us . Can we have an official release in order to integrate this in our tests? Thank you

[t-sommer]

Until the next release, you can download the distribution directly from https://github.com/modelica/Reference-FMUs/actions/runs/12296313654.