when I use one node (one PC) in parallel computation the process went smoothly and utilize all available cores, while when I add tow more nodes (2 PCs) I face the following problem:
“Reading cross sections XML file…
ERROR: No cross_sections.xml file was specified in materials.xml or in the
OPENMC_CROSS_SECTIONS environment variable. OpenMC needs such a file to
identify where to find data libraries. Please consult the user’s guide
at https://docs.openmc.org/ for information on how to set up data
libraries.”