Giuseppe Bilotta · @giuseppebilotta
155 followers · 292 posts · Server fediscience.org

FWIW, even the “original” has been a continuous source of issues for us, so much so that I have a GitHub repository just to collect test cases for my bug reports to upstream.
The most notable issues?
Certain versions of Thrust with certain versions of the NVIDIA drivers led to GTX TITAN X (Maxwll) GPUs stalling or deadlocking after thousands of iterations.
github.com/NVIDIA/thrust/issue
You could imagine how fun this was for our PhD student whose workstation had that hardware.

#thrust #nvidia

Last updated 1 year ago

Giuseppe Bilotta · @giuseppebilotta
155 followers · 291 posts · Server fediscience.org

one is a build failure against my GPU (already reported, with a fix ready and pending release), and the other is … slow performance in one of the API calls that we use!

Turns out, `sort_by_key`, at least in the way we use it, is somewhere between 25% and 30% slower on my iGPU when using the latest (from the 5.6.0 software stack) than it is on the *CPU* when using the latest with the OpenMP backend!

#rocthrust #amd #thrust

Last updated 1 year ago

Giuseppe Bilotta · @giuseppebilotta
155 followers · 289 posts · Server fediscience.org

So, one of the reasons why we could implement the backend easily in is that provides drop-in replacement for much of the ‌ libraries, including , which (as I mentioned in the other thread) is a fork of with a /‌ backend.
This is good as it reduces porting effort, *but* it also means you have to trust the quality of the provided implementation.

#thrust #rocthrust #CUDA #nvidia #ROCm #amd #GPUSPH #hip

Last updated 1 year ago

Giuseppe Bilotta · @giuseppebilotta
155 followers · 288 posts · Server fediscience.org

There's another important different I haven't mentioned, between the CA and GPUSPH. All of the GPU code in the CA is “custom”, compute kernels written by yours truly. In GPUSPH, instead, there are a few instances where we rely on an external library: .

I've already complained a bit about how this affects us <fediscience.org/@giuseppebilot> especially in terms of backend support, but things are *even worse*, and I'll take the opportunity here to complain a bit!

#thrust

Last updated 1 year ago

MMR Nmd · @MMRnmd
767 followers · 12337 posts · Server todon.eu
Giuseppe Bilotta · @giuseppebilotta
147 followers · 248 posts · Server fediscience.org

Corporate at its worst: controls the library and its , and backend. provides rocThrust, that is just Thrust with the CUDA part stripped an a new backend for / . Nobody* is working on a backend for
provides its own alternative as , which is NOT a drop-in replacement.

This is why we can't have nice things.

*there's a dead project here
github.com/wdmapp/syclthrust

#onedpl #oneAPI #intel #sycl #hip #ROCm #amd #tbb #OpenMP #CUDA #thrust #nvidia #floss

Last updated 2 years ago

Heron&Fox Photo · @heronfoxphoto
30 followers · 228 posts · Server universeodon.com

A of a at ’s LC-37B.
The IV is a variant of the Delta IV with 3 ’s mounted side-by-side with the mounted on the center CBC. The center CBC throttles its RS-68 down to 55% rated while the “outboard” CBC’s remain at 100% until .
The center CBC then throttles up until it burns its fuel, then releases the DCSS and .
heronfox.pixels.com/featured/t

#photograph #unitedlaunchalliance #ula #deltaivheavy #rocket #capecanaveral #delta #heavy #commonboostercores #cbc #deltacryogenicspperstage #dcss #rocketdyne #engine #thrust #burnout #spacecraft

Last updated 2 years ago

Giuseppe Bilotta · @giuseppebilotta
140 followers · 189 posts · Server fediscience.org

The most important is definitely our dependency on in a couple of places, but the extensive use of constant and shared memory is also a problem, since the syntax for their use in is very different from the one in , which would pose a problem for our plans to keep the device source code unified across APIs.

#CUDA #sycl #thrust

Last updated 2 years ago

Heron&Fox Photo · @heronfoxphoto
30 followers · 228 posts · Server universeodon.com

A of a United Launch Alliance with a BlockII-F from in Air Force Station . This version of the Atlas V is carrying its payload in a 4 meter fairing, no solid rocket boosters, and a single RL-10 on its upper stage.
The first stage’s Russian-made RD-180 is beginning to develop its full , and slowly lifting the 401 off the pad.
heronfox.pixels.com/featured/a
(Edited to include link)

#photograph #ula #altasv #rocket #liftingoff #gps #slc40 #capecanaveral #ccafs #centaur #engine #thrust

Last updated 2 years ago

Toy Box Comix · @ToyBoxComix
121 followers · 383 posts · Server retro.pizza
Spaceflight 🚀 · @spaceflight
1026 followers · 542 posts · Server techhub.social

has never ignited more than 42% of ’s 33 Raptor at once. When it ignites 🔥 all 33 engines, its maximum could leap to 7590 tons, beating the next in history – the Soviet N1 – by nearly 60% 💪 teslarati.com/spacex-sets-stag

test probably 📆 January 30th, 31st, or February 1st

#SpaceX #SuperHeavy #engines #thrust #most #powerful #rocket #starship

Last updated 2 years ago

Spaceflight 🚀 · @spaceflight
980 followers · 522 posts · Server techhub.social
ttmarket · @ttmarket
6 followers · 29 posts · Server toot.community

RT one of Walter Deemer
@WalterDeemer
The stock market generated Breakaway Momentum today for the 25th time since 1945: walterdeemer.com/bam.htm
This is a genuine breadth thrust. It means (IMHO) we're in a bull market.
How long it lasts, and how far it carries, is something we will know only in the fullness of time.

Momentum

#deemer #breakaway #spx #thrust

Last updated 2 years ago

Dead Astronaut · @dead_astronaut
105 followers · 47 posts · Server kolektiva.social

Holy crap how did I miss that Lidia Yuknavitch had a new book this past summer! Thrust.

Book of Joan was one of the most fantastic books I've ever read. Has anyone read this latest of hers??

@bookstodon

#books #thrust #bookofjoan #yuknavitch

Last updated 2 years ago

Dead Astronaut · @dead_astronaut
100 followers · 43 posts · Server kolektiva.social

Holy crap how did I miss that Lidia Yuknavitch had a new book this past summer! Thrust.

Book of Joan was one of the most fantastic books I've ever read. Had anyone read this latest of hers??

@bookstodon

#books #thrust #bookofjoan #yuknavitch

Last updated 2 years ago

Spaceflight 🚀 · @spaceflight
539 followers · 218 posts · Server techhub.social

@Time 📆 December 2, 2022 successfully test-fired 11 of the 33 engines on its that will produce more than 7.25 million kg of , nearly double 💪 that of the . The stands 69 m tall and serves as the first stage carrying the 50 m 🚀. The entire stack stands nearly 40 stories tall—again easily beating out the ’s 32 stories. time.com/6238248/spacex-starsh

#SpaceX #SuperHeavy #rocket #thrust #sls #starship #spacecraft

Last updated 2 years ago

Bryce · @coffeemayonnaise
97 followers · 200 posts · Server mastodon.energy

I designed the controllers and worked on the controller too along with the overall architecture of . Very proud to see this vehicle March towards flight

#engine #thrust #vector #avionics #terran1 #3dpriting #space #rockets #rocketscience #engineering #electricalengineering #electric #circuitdesign

Last updated 2 years ago

Bryce · @coffeemayonnaise
97 followers · 200 posts · Server mastodon.energy

instagram.com/reel/Cl7HtAousbH

Not sure if the link will work well here. I designed the controllers and worked on the controller too along with the overall architecture of . Very proud to see this vehicle March towards flight

#engine #thrust #vector #avionics #terran1 #3dpriting

Last updated 2 years ago

Spaceflight 🚀 · @spaceflight
376 followers · 128 posts · Server techhub.social

...the extreme of the Launch System caused some to the mobile launch tower. The violent shaking from the also the tower's access and blew its off arstechnica.com/science/2022/1

#thrust #space #rocket #damage #launch #broke #elevator #doors

Last updated 2 years ago

tobias gray · @tobiasgray
193 followers · 212 posts · Server writing.exchange

The AI adjusted the . It glided silently through space over the rocky moon and then descended to the planet below.
Soon its cargo will awake and begin to transform the world into one they can thrive on. They will change the name, Earth just won't do.

#vss365 #thrust

Last updated 2 years ago