tech.ryancox.net

A technical blog by Ryan Cox

Wednesday, May 14, 2025

Securely Running Windows in HPC

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We now have proper Windows support in our HPC environment.  Hooray?  It is through pretty novel means, meant to make it as secure as possibl...
Friday, January 21, 2022

Network Segmentation of Users on Multi-User Servers and Networks

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Early last year, I finished a paper for the Master of Science in Information Security Engineering program at SANS Technology Institute. The...
Friday, December 18, 2020

Fixing bad T10-PI checksums

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Background (in case you care) Let's say you have some kind of hypothetical data disaster where you lose all redundancy in a RAID-6 pool...
Monday, November 16, 2015

pam_slurm_adopt

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pam_slurm_adopt is a PAM module I wrote that adopts incoming ssh connections into the appropriate Slurm job on the node. The module allows ...
Wednesday, April 1, 2015

Caller ID: Handling ssh-launched processes in Slurm

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I have thought long and hard about it, but I finally figured out how to handle ssh-launched processes in Slurm.  ssh may be used to launch t...
Friday, August 29, 2014

Fair Tree Slurm Fairshare Algorithm

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That's right.  Levi Morrison and I created a second Slurm fairshare algorithm, Fair Tree.  Our first algorithm, LEVEL_BASED , was acc...
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Friday, June 20, 2014

LEVEL_BASED Slurm Prioritization Algorithm

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Levi Morrison and I have co-authored a new prioritization mechanism for Slurm called LEVEL_BASED.  To see why it is necessary, please see m...

Problems with Existing Slurm Prioritization Methods

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UPDATE :  Level-Based was replaced by Fair Tree , an even better algorithm that we created. Levi Morrison and I have co-authored a new ...
Thursday, May 22, 2014

Job Script Generator for Slurm and PBS published on Github

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We published version 2.0 of our batch job script generator on Github .  It is a Javascript library (LGPLv3) that allows users to learn Slurm...
Thursday, April 17, 2014

Scheduler Limit: Remaining Cputime Per User/Account

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Update May 9, 2014:   Added a link to our GrpCPURunMins Visualizer I have discussed this with several interested people recently so it...
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About Me

Ryan Cox
Ryan is the Director of Research Computing at BYU. He has worked in the HPC field for almost two decades.
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