The Tri-Lab Operating System Stack (TOSS) is a Linux distribution based on Red Hat Enterprise Linux (RHEL) that was created to provide a software stack[1] for high performance computing (HPC) clusters[2] for laboratories within the National Nuclear Security Administration (NNSA).
[4] The OS is used by NNSA computers including the El Capitan supercomputer[5] and systems using ARM architecture including the ThunderX2 system on a chip (SoC).
[6] In addition to being used by the National Nuclear Security Administration (NNSA),[2] most of the systems in NASA's High-End Computing Capability Project, part of the NASA Advanced Supercomputing Division, were all migrated to TOSS in March 2022.
[7] Many of the software packages included in TOSS are from the RHEL repository.
[1] The system also uses SLURM and Flux scheduling and resource management software.