Viewing profile — wickberg

Newer airports usually try to have space, that's the only thing helping with the physics involved here. Older airports might have EMAS [1] retrofitted at the ends to help stop plan…

The US technician exam has almost zero relevance to operating a radio, outside of some legal reminders to broadcast your call sign every 10-minutes. I'll second the recommendation …

That's 200Gbps from that card to any other point in the other 9,408 nodes in the system. Including file storage. Within the node, bandwidth between the GPUs is considerably higher.…

Frontier is 4x 200Gbps links per node into the interconnect. The interconnect is designed for 540TB/s of bisection bandwidth. https://icl.utk.edu/files/publications/2022/icl-utk-15…

"Aurora" at Argonne National Labs is intended to be a bit bigger, but has suffered through a long series of delays. It's expected to surpass Frontier on the TOP500 list this fall o…

On a node-level, usually these are aiming for around 90-95% allocated. Note that, compared to most "cloud" applications, that usually involves a number of tricks at the system sche…

Almost no modern systems are running Torus these days - at least not at the node level. The backbone links are still occasionally designed that way, although Dragonfly+ or similar …

Frontier runs unclassified workloads. Other Department of Energy systems, such as the upcoming "El Capitan" at LLNL (a sibling to Frontier, procured under the same contract) are us…

I know Golang has their own implementation of sd_notify(). For Slurm, I looked at what a PITA pulling libsystemd into our autoconf tooling would be, stumbled on the Golang implemen…

Cluster authentication actually remains the sore point for all interactions - for most systems the least-common denominator remains whether one can SSH into a login node. At which …

Slurm is endian and word-size agnostic; there's nothing about the POWER9 platform that would be insurmountable for it to run on. There are occasionally some teething issues with NU…

In terms of KNL deployments, LANL's Trinity system (#9 on June 2018) is slightly larger. Trinity has 9,984 KNL nodes, vs 9,688 in Cori.

I use it on my motorcycle in the US, but there are some major pain points. I have a Bluetooth headset in my helmet, so I can hear the directions... which are usually close enough. …

I don't have any customer data on hand at the moment, but I'd roughly describe it as basic scheduling on strict priority order getting the system to 80+% usage, and then backfill b…

If you're the one that came up with the idea of the "quiesce", I feel like you owe quite a few of us in the systems software community a beer or three...

99% is a bit higher than most systems expect to run at - any mix of job sizes in the queue will tend to leave small gaps when nodes need to stay idle until jobs "fit" perfectly aga…

Part time PhD's are rare - most professors need their grad students to be working on their grant-related research projects as RAs. That work is then used as the basis for your diss…

It's even more subtle than that - about half of Connecticut is heavily involved with business in NYC, and would probably be quite unwilling to jump an hour over. To a lesser extent…

The Netflix Open Connect appliances are custom-built hardware they send out to ISPs. [1] As evidenced by their heroic efforts to tunes performance[2], and their careful choice of h…

Indeed, it does look like the set she's holding is one of three that were sold in the auction. If Adafruit has actually acquired the brand, this is certainly an odd way to go about…

The Xeon... maybe. The Phi... definitely slower. The single-core performance is very low, and there are usually at least a few linking stages in any source code compilation that co…

SchedMD | Software Engineer | Lehi, Utah | ONSITE https://www.schedmd.com SchedMD are the developers of the open-source Slurm resource manager (aka job scheduler) used by roughly h…

This is meant as a competitor, at least in the high-performance computing market, to Intel's Xeon Phi (aka Knights Landing) based systems which will start including their OmniPath …

STS was never fully automated, they would have needed to install a temporary cable that allowed the landing gear to be automatically deployed. It looks like https://en.wikipedia.or…

Mix in the just-announced CVE-2014-9322, among others, and you have a fairly obvious path to root. Generally, at any time, it's safer to assume there's at least one active local ro…