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Featured Articles
Running Jobs Before Dedicated Time
The PBS batch scheduler supports a feature called shrink-to-fit (STF). This feature allows you to specify a range of acceptable wall times for a job, so that PBS can run the job sooner than it might otherwise. STF is particularly helpful when...
31 Mar, 2021
Views: 17243
Preparing to Run on Athena Turin Nodes
To help you prepare for running jobs on Athena's Turin nodes, this short user guide includes information on the general configuration of Turin nodes, compiling your code, and running PBS jobs. Athena Front-End Systems Four new front-ends...
23 Apr, 2026
Views: 5539
AMD Turin Processors
The AMD Turin nodes of the new Athena cluster are installed in a module located less than a mile from the main NAS building. This is a simplified configuration of an AMD Turin node with two EPYC 9745 processors (i.e., two sockets) and a...
17 Feb, 2026
Views: 7681
Athena Configuration Details
Athena is a modular computing system housed in NASA's Modular Supercomputing Facility, located less than a mile from the main NAS building. Athena is configured as follows: AMD Turin-Based Compute Resources 4 racks 1,024 Turin nodes 262,144...
13 Jan, 2026
Views: 4095
Using the myNAS Web Portal
The myNAS web portal provides a central location where you can easily monitor all aspects of your NAS user account activity, including PBS jobs, resource allocations, and usage for the project group IDs (GIDs) you belong to. If you use the Shift...
26 May, 2026
Views: 13697
Most Viewed
Using GPG to Encrypt Your Data
Encryption helps protect your files during inter-host file transfers that use protocols that are not already encrypted—for example, when using ftp or when using shiftc without the secure option. We recommend using the GNU Privacy Guard (GPG), an...
03 Dec, 2025
Views: 279967
Commonly Used PBS Commands
The four most commonly used PBS commands, qsub, qstat, qdel, and qhold, are briefly described below. See man pbs for a list of all PBS commands. qsub To submit a batch job to the specified queue using a script: %qsub -q queue_name job_script ...
01 Sep, 2026
Views: 156108
Using MobaXterm for SSH Connections from Windows Systems to NAS
You can use MobaXterm to connect from your local Windows system to NAS systems via SSH, as an alternative to Cygwin/OpenSSH. MobaXterm includes a built-in X11 client, and has the ability to forward X11 from NAS systems back to your local system....
25 Mar, 2026
Views: 144437
Setting Up SSH Passthrough
NAS supercomputers are served by several front-end systems within the secure enclave. These include: Athena: athfe[01-04] Cabeus: cfe[01-02], cghfe[01-02] Aitken Milan: afe[01-02] Aitken Cascade Lake & Rome; Electra; Endeavour:...
25 Mar, 2026
Views: 129607
Lustre Best Practices
At NAS, Lustre (/nobackup) filesystems are shared among many users and many application processes, which can cause contention for various Lustre resources. This article explains how Lustre I/O works, and provides best practices for improving...
03 Dec, 2025
Views: 123878
Public/Private Key Pairs
Public-key authentication is a means of identifying yourself by proving that you know the private key associated with a given public key. This method is more secure than password authentication, but it requires more effort to set up. Public-Key...
19 Jan, 2018
Views: 107416
Recently Updated
Preparing to Run on Endeavour
The Endeavour supercomputer comprises two nodes, Endeavour3 and Endeavour4. Each of the two systems includes 896 cores and six terabytes (TB) of global shared memory. See Endeavour Configuration Details for more hardware information. Endeavour 3...
04 Nov, 2026
Views: 4331
NAS Lustre Filesystems
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...
03 Nov, 2026
Views: 38025
Job Accounting
Usage on HECC compute systems is charged using a standard billing unit (SBU). SBUs are charged to each PBS job running on the compute nodes according to the following formula: SBUs charged = wall-clock hours used * number of MAUs * SBU rate ...
16 Oct, 2026
Views: 18469
Reserving a Dedicated Compute Node
The reservable front end feature allows you to reserve dedicated access to an Electra compute node for up to 90 days. You can use the node the same way you would use a PFE—to submit jobs and perform other tasks such as post-processing,...
16 Oct, 2026
Views: 20422
PBS Job Queue Structure
Running Jobs on Athena To run a PBS job on the Athena compute nodes, submit the job from one of the Athena front-end systems (ATHFEs) to one of the queues managed by the PBS server pbs06a: devel, normal, long, and wide. Note: You cannot submit...
14 Oct, 2026
Views: 55599
Requesting Cabeus GPU Resources
The Cabeus cluster comprises two types of NVIDIA GPU nodes, including nodes with x86_64-based CPUs and nodes with aarch64-based CPUs. Note: You must have a Standard Billing Unit (SBU) allocation specifically for GPUs in order to use the GPU...
13 Oct, 2026
Views: 19643
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