The newly released version of NumPy 2.0 includes substantial internal changes, including migrating code from C to C++. These modifications have led to significant issues... Read more

GNU compiler versions 10+ may have C compiler errors like

/.libs/libmca_mtl_psm.a(mtl_psm_component.o): multiple definition of `mca_mtl_psm_component'

This is a ... Read more

GNU compiler versions 10+ may have Fortran compiler errors like

Error: Type mismatch between actual argument at (1) and actual argument at (2) (REAL(4)/REAL(8))

... Read more

OSC will remove the default MATLAB Jupyter Kernel on Tuesday, May 20th, 2025. To create your own Jupyter MATLAB Kernel please follow the documentation on the MATLAB Page... Read more

The default CPU binding for ORCA jobs can fail sporadically.  The failure is almost immediate and produces a cryptic error message, e.g.

$ORCA/orca h2o.in... Read more          

You may experience a multi-node job hang if the job runs into a module that requires heavy I/O, e.g., MP2 or CCSD. Additionally, it potentially leads to our GPFS performance issue. We have... Read more

Your job utilizing openmpi/4.1.x-hpcx (or 4.1.x on Ascend) might hang while writing files on a shared file system. This issue is caused by a ... Read more

PyTorch can hang on Ascend on dual-GPU nodes

Through internal testing, we have confirmed that the hang issue only occurs on Ascend dual-GPU (nextgen) nodes. We’re still unsure why... Read more

A threading code with MPI where MPI_Init_thread uses MPI_THREAD_MULTIPLE will fail because UCX from HPCX package is built without enabling multi-threading. UCX is the... Read more

Several applications using OpenMPI, including HDF5, Boost, Rmpi, ORCA, and CP2K, may fail with errors such as

mca_coll_hcoll_module_enable() coll_hcol: mca_coll_hcoll_save_coll_handlers... Read more