https://www.nas.nasa.gov/hecc/support/kb/99/ https://www.nas.nasa.gov/hecc/support/kb/nas-lustre-filesystems_225.html All NAS systems share several filesystems intended to provide working space for compute jobs. These filesystems, called "nobackup" (/nobackuppX), provide more than 90 petabytes (PB) of disk space and serve many thousands of cores. The /nobackup... Filesystems & Software/Filesystems/Lustre Filesystems Tue, 03 Nov 2026 11:15:02 -0800 https://www.nas.nasa.gov/hecc/support/kb/software-on-nas-x86_64-systems_116.html Software programs on NAS systems are managed as modules or packages. Among the NAS systems, Cabeus' aarch64-based GH200 GPU nodes running the TOSS5 operating system have a relatively small collection of sofware packages; the x86_64-based CPU-only... Filesystems & Software/Software Fri, 25 Sep 2026 13:57:40 -0700 https://www.nas.nasa.gov/hecc/support/kb/how-to-run-a-graphics-application-in-a-pbs-batch-job_523.html In order to run a graphics application in a PBS batch job, you must provide a value for the DISPLAY environment variable—even if you do not have or need an actual display for the job. If the batch job cannot find this value, it will quit and return... Filesystems & Software/Software Mon, 14 Sep 2026 16:57:27 -0700 https://www.nas.nasa.gov/hecc/support/kb/hpc-environment-overview_25.html Our HPC environment is operated by staff in the NASA Advanced Supercomputing (NAS) Division at Ames Research Center located at Moffett Field, CA. The supercomputers and support staff are funded by NASA's High-End Computing Capability (HECC)... Filesystems & Software Tue, 01 Sep 2026 11:00:00 -0700 https://www.nas.nasa.gov/hecc/support/kb/quota-policy-on-disk-space-and-files_156.html Filesystems on NAS systems have the following types of quotas: Limits on the total disk space occupied by your files Limits on the number of files (represented by inodes) you can store, regardless of size. For quota purposes, directories count... Filesystems & Software/Filesystems Tue, 01 Sep 2026 10:56:28 -0700 https://www.nas.nasa.gov/hecc/support/kb/home-filesystems-for-nas-compute-resources_227.html The home filesystems on all NAS compute systems are HPE/SGI NEXIS 9000 filesystems that are NFS-mounted on all of the NAS compute system front-end nodes and compute nodes. Each NAS user is provided a home directory on the home filesystems for NAS... Filesystems & Software/Filesystems/Home Filesystems Tue, 01 Sep 2026 10:55:22 -0700 https://www.nas.nasa.gov/hecc/support/kb/installing-r-packages-in-your-own-directories_542.html R is a language and environment for statistical computing and graphics. For the NAS Athena system running the TOSS5 operating system, it is available after loading the cray-R module. For other NAS x86_64 systems running the TOSS4 operating system,... Filesystems & Software/Software Tue, 25 Aug 2026 11:19:17 -0700 https://www.nas.nasa.gov/hecc/support/kb/using-conda-environments-on-nas-systems_557.html WARNING: This article was recently updated with information about using conda environments on Grace Hopper nodes. Please note that because these nodes are fundamentally different from the other NAS node types, due to their Arm architecture, conda... Filesystems & Software/Software Mon, 17 Aug 2026 13:01:31 -0700 https://www.nas.nasa.gov/hecc/support/kb/vnc-a-faster-alternative-to-x11_257.html Virtual Network Computing (VNC) software provides a way to reduce X11 overhead on high-latency networks such as the Internet. In practical terms, once a VNC session is underway, latencies are on the order of seconds rather than minutes. VNC can... Filesystems & Software/Software Wed, 25 Mar 2026 13:34:03 -0700 https://www.nas.nasa.gov/hecc/support/kb/running-applications-on-nas-systems-with-your-local-license_511.html If you want to run an application on NAS systems with a license that resides on a local license server (not directly accessible from outside your local network), you can use SSH tunneling, also known as port forwarding. The examples below show you... Filesystems & Software/Software/Licensed Application Software Wed, 25 Mar 2026 13:29:39 -0700 https://www.nas.nasa.gov/hecc/support/kb/using-nas-matlab-licenses_533.html A limited number of MATLAB licenses are available on NAS-supported workstations and supercomputing systems. To check current MATLAB license usage, run the check_licenses command as follows: /u/scicon/tools/bin/check_licenses -m (view general... Filesystems & Software/Software/Licensed Application Software/MATLAB Wed, 14 Jan 2026 09:55:33 -0800 https://www.nas.nasa.gov/hecc/support/kb/using-gprof-for-performance-analysis_671.html Gprof is a compiler-assisted performance profiler for C, Fortran, and Pascal applications running on Unix systems. You can use Gprof to help identify hotspots in your application where code optimization efforts may be most useful. Gprof uses a... Filesystems & Software/Software/Licensed Application Software Fri, 19 Dec 2025 10:27:03 -0800 https://www.nas.nasa.gov/hecc/support/kb/managing-and-installing-python-packages-in-conda-environments_627.html You have two options to install your own Python packages in our machine learning environment: Use the pip tool to install them directly Build your own conda environment Consider the benefits and disadvantages of each method, described below,... Filesystems & Software/Software Thu, 18 Dec 2025 16:14:41 -0800 https://www.nas.nasa.gov/hecc/support/kb/compiling-matlab-scripts-into-executables-to-reduce-the-use-of-licenses_527.html NAS currently has 16 MATLAB licenses available. To avoid overwhelming the license server, and to reduce contention for the limited number of licenses, PBS batch jobs running on most NAS compute nodes are not allowed to query the MATLAB license... Filesystems & Software/Software/Licensed Application Software/MATLAB Tue, 16 Dec 2025 13:48:32 -0800 https://www.nas.nasa.gov/hecc/support/kb/using-software-packages-in-pkgsrc_493.html The NetBSD Packages Collection (pkgsrc) is a third-party software package management system for Unix-like operating systems. Among the over 17,000 packages available in pkgsrc, a few hundred of them have been built on NAS x86_64 systems and are... Filesystems & Software/Software Thu, 04 Dec 2025 10:15:13 -0800