Hello,
I keep getting this warning when trying to run OpenMC, it doesn’t seem like it is any cause for concern based on other posts, but I do want to understand what is happening here. Here is the full warning message: Mon Sep 29 11:46:48 PDT 2025
/usr/workspace/venv-openmc/lib/python3.13/site-packages/openmc/mixin.py:70: IDWarning: Another Filter instance already exists with id=1.
I get this message when running locally or on hpc. I’ve noticed my results running in parallel are very different than running locally, but the peculiar thing is that some tallies remain the same, but others are off by a factor of two. Could the filter instances be affecting this? My HPC group has asked me to look into this warning message.
Thank you,
Alex