egg|zzz|egg changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Clifford. We currently target 1.2.2, and 1.3.1. <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/
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<awang>
egg|work|egg: You should tweet Elon to figure out the orbital elements of the Roadster
<awang>
Then put it as another body in Principia
<lamont>
just add it to RSS
<lamont>
Principia just needs to know to treat it as gravityless like a ship
<awang>
Ah
<awang>
So that's why RSS expanded had issues
<awang>
Because the additional bodies had gravity
<awang>
Wonder if Squad will add it as an easter egg
<awang>
Instead of getting a magic boulder, you get Elon's Tesla
<awang>
TIL nodal precession is 5-7 degrees per day
<awang>
That's a heck of a lot more than I expected
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<lamont>
the tesla would still have to participate in all the n-body calcs as a body that was affected by them, but it wouldn’t need to appear as a source because you wouldn’t ever want to orbit the tesla
<lamont>
should port the critical n-body integrators in principia to opencl and/or cuda to run them on GPUs so RSS Expanded would be more reasonable
<awang>
Oh jeez
<awang>
As if the build process for Principia weren't weird enough already
<awang>
Adding GPU languages would be not fun
<awang>
Would GPUs mess with the numerically stable algorithms?
<awang>
idk how they do floating point internally
<awang>
Also, aren't most consumer cards limited to single-precision floats?
<awang>
And do integrators get that much speedup from GPUs?
<awang>
I thought they weren't easily parallelizable
<awang>
Pretty sure I saw something a while back that automatically translated C++ to one GPU language or another...
<lamont>
i played with opencl awhile back, pretty sure you can just embed it in C/C++
<lamont>
and one of its targets is just the FPU, so if it can’t find a suitable GPU it just falls back gracefully
<lamont>
nvidia opencl support was kind of ass until fairly recently though (i think my 980 is sorta okay, but anything before that is crap IIRC, while the newer stuff is much better)
<awang>
Ah, didn't know about the fallback thing
<awang>
Hmmm... would different Principia versions need to be compiled for different GPUs?
<lamont>
no
<lamont>
particularly if you just use opencl everywhere it would still be one universal binary