egg|nomz|egg changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer.
<egg> bofh: ... wait idea, if I just use the 32x32 mul I still have plenty of bits to do the integer approximation stuff
<egg> (probably makes the error analysis messy though)
<SnoopJeDi> UmbralRaptop, wait so are your data inhomogeneous? ndarray has to be one dtype, or you have to give it a tuple of dtypes for tabular mixed data
<SnoopJeDi> if you're doing that though, you *probably* want astropy or pandas?
<SnoopJeDi> numpy's "named" columns are weird to me, it feels like a bolt-on feature
<UmbralRaptop> SnoopJeDi: some columns have floats, some have strings. The contents of any one column are homogeneous.
<SnoopJeDi> okay. numpy can do that with structured arrays but yea you have to pass a dtype tuple https://docs.scipy.org/doc/numpy-1.13.0/user/basics.rec.html
<SnoopJeDi> it's...bad.
<UmbralRaptop> I did that. It's yeah, brittle.
<SnoopJeDi> idk if astropy lets you construct Tables from arbitrary data, though
<SnoopJeDi> probably does though because it's meant to be a cleaner DataFrame for astronomers
<UmbralRaptop> Probably.
* UmbralRaptop stares at the FITS format, and how it explicitly references tapes and cards. >_> <_<
<iximeow> ah, fits
<iximeow> i'm going to have to write things to deal with fits, i fear
<SnoopJeDi> oh if it's FITS you *definitely* want astropy!
<SnoopJeDi> astrop.io.fits \o/
<SnoopJeDi> astropy*
<SnoopJeDi> unless you just mean to point out FITS as a not-great example of technological baggage :P
* SnoopJeDi stares at OPAL, which outputs to HDF5...and stores every step of Runge-Kutta on its own Group
<SnoopJeDi> if you wanna do time-series anything glhf
<UmbralRaptop> I'm being silly about FITS, it's a CSV
<SnoopJeDi> mkay
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<egg> bofh: hm so to check for infinities, denormals, etc. the SSE4.1 test instructions seem nice but currently we're aiming for SSE3 (so as to not introduce restrictions beyond x86-64)
<egg> UmbralRaptor: do you have a prescott birb
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<UmbralRaptor> egg: I used to, but stopped using it for KSP in 2012, and it then died somewhere around 2013.
<UmbralRaptor> If I'm remembering my Pentium 4s correctly.
<B787_300> UmbralRaptor: are you noe in the IAD area? Just based on the questions you had recently
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<egg|phone|egg> Why am I not zzz
<B787_300> Because your phone is smart enough to know you aren't sleeping but ircing
<B787_300> Or are you asking why you can't sleep?
<UmbralRaptor> egg: sleep has less direct evidence than dark matter.
<UmbralRaptor> B787_300: yeah. Fairfax VA.
<B787_300> UmbralRaptor: I know I will 've out there in Oct for a wedding
<UmbralRaptor> We should probably meet up.
* UmbralRaptor ignores the 1.0 probability of something coming up.
<B787_300> We should. I mean we would have already had I not gotten on the wring train at DFW that one time
<bofh> egg: so basically SSE2 since I don't think anything in SSE3 is useful for you. :P
<egg> bofh: yeah, maybe you can use addsubpd as part of a wedge but otherwise i don't see anything
<bofh> addsubpd is equivalent to just an xorps plus an addpd :P
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<iximeow> haha .. ha ... ha ..
<UmbralRaptor> !u s⃑
<Qboid> U+0073 LATIN SMALL LETTER S (s)
<Qboid> U+20D1 COMBINING RIGHT HARPOON ABOVE (◌⃑)
<UmbralRaptor> …harpoon? o_O
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<egg|work|egg> !wpn whitequark
* Qboid gives whitequark a barbarian resonance
<whitequark> !wpn egg
* Qboid gives egg an algebra
<whitequark> ha
<egg|work|egg> yay
* egg|work|egg blankly stares at a week's worth of mail
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<egg|work|egg> !wpn UmbralRaptop
* Qboid gives UmbralRaptop a greening emulsifier
<egg|work|egg> !wpn bofh
* Qboid gives bofh a shredder
* egg|work|egg wonders whether the emulsifier pinged Ellied
<SnoopJeDi> pesto made with a blender?
<SnoopJeDi> oh nah, emulsifier not emulsion
<SnoopJeDi> maybe moldy mustard, then.
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* awang 🔪 Windows
<awang> Yes, Microsoft, I'd love for you to wipe my partition table when upgrading
<whitequark> !wpn egg
* Qboid gives egg an IEEE 488 package
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<egg|work|egg> UmbralRaptop: I may or may not have checked in a TODO that says "document, preferably before getting mauled by a ネコバス"
<UmbralRaptop> ^_^
<egg|mobile|egg> RT if you have any questions or concerns please visit the plug-in settings to determine how attachments are handled
<egg|work|egg> O_o
<egg|mobile|egg> RT if you have any questions or concerns please visit the plug-in settings to determine how attachments are handled the situation and I will be nice to see you soon and I will be nice to see if you have any questions or concerns please...
<egg|mobile|egg> Seems to diverge eventually
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<egg> !wpn whitequark
* Qboid gives whitequark a sparse nose
<egg> bofh: tbh I'm surprised that this is happening already
<egg> !u U+410A
<Qboid> U+410A CJK IDEOGRAPH EXTENSION A-410A (䄊)
<bofh> egg: same, honestly, wtf.
<egg> bofh: do you have something that's neither a sandy nor a skylake to compare for other architectures
<egg> !wpn bofh
* Qboid gives bofh a stretchy missile-like power supply
<egg> !wpn rqou
* Qboid gives rqou a giant Spivak
<whitequark> i have a kaby lake and a coffee lake
<whitequark> and a uh
<egg> "coffee lake" sounds fun
<whitequark> oh no that one is a skylake
<egg> whitequark: tbh building principia is interesting, building that odd branch where I've been doing my cbrt benchmarks is probably too much of a mess
<whitequark> egg: just build it for linux?
<whitequark> and gimme a binary
<egg> not sure I've ever built the benchmarks on linux :-p
<egg> whitequark: also I guess the really interesting result would be to see on older architectures whether the polynomial was significantly faster than the padé, both sandy and skylake are very close https://twitter.com/eggleroy/status/988114872616484866
* egg afknomz
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<UmbralRaptop> In principle, I have a Yonah lying around.
<SnoopJeDi> oh wow, one of our profs was awarded a *second* Landau medal this year
<bofh> SnoopJeDi: NICE
<bofh> egg|nomz|egg: I have a Haswell & a Nehalem handy
<SnoopJeDi> he's apparently the only person who's received it a second time, but also wicked smaht
<bofh> egg|nomz|egg: few mins
<bofh> SnoopJeDi: very nice
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<egg|nomz|egg> bofh: do you know of any transcription of https://twitter.com/eggleroy/status/988114872616484866 ?
<egg|nomz|egg> um
<bofh> uhm
<bofh> not offhand, but I'll check.
<egg|nomz|egg> wait is it the right tablet
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<egg> hmm
<egg> bofh: http://www.academia.edu/15173145/On_the_Rules_for_the_Royal_Game_of_Ur but I can't seem to dowload a pdf without logging in to a silly thing?
<UmbralRaptor> sci-hub?
<bofh> egg: sec
<bofh> https://twitter.com/TheYear20XX/status/988426414314569728 LOL how does one say "updog" in Akkadian?
<UmbralRaptor> These are reasonable RVs, right? https://photos.app.goo.gl/ifbLPqnRAVZE87Nz2
<egg> UmbralRaptor: probably
<egg> UmbralRaptor: both you and the star are moving infinitely fast, hence NaN
<UmbralRaptor> I'm 90% certain that I know where the bug is, and it's frustrating because I thought I had preempted it.
* UmbralRaptor thinks about NaNs.
* UmbralRaptor 's nose starts bleeding.
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<egg> bofh: hah
<egg> all hail academic ~s :-p
<egg> !wpn bofh
* Qboid gives bofh a gregarious linker
<bofh> !wpn egg
* Qboid gives egg a normal interhalogen
* bofh feeds the linker the collection of object files from a llvm compile
<egg> bofh: the linker runs back to the linker herd
<egg> the linker moos
<SnoopJeDi> !wpn -add:adj bovine
<Qboid> SnoopJeDi: Adjective already added!
<egg> bofh: hah, Σέλευκος is written 𒋛𒇻𒆪
<egg> (si-lu-ku)
<bofh> egg: wasn't he from like Macedon, so like 400BCE or later?
<bofh> how the heck was his name in a document from Ur?
<UmbralRaptor> Vampires.
<egg> bofh: the game is from Ur, the tablet is late
<rqou> egg: not sure exactly what you're doing with benchmarking, but if you want i can run your stuff on a Diamondville N270 if you want some fun totally-different uArch
<egg> bofh: also, nice 3D model of 𒀉𒊑𒈪 http://www.factumfoundation.org/pag/266/The-Statue-of-Idrimi
<bofh> rqou: I mean I can also run this stuff on a ev68 DEC alpha :P
<bofh> (also ARMv7-NEON & ARM64, but those are more standard)
<egg> !wpn rqou
* Qboid gives rqou a RF Ibuprofen
<UmbralRaptor> Anyone got an M68k system lying around?
<UmbralRaptor> !wpn egg
* Qboid gives egg a xenon VAX
<rqou> yes
<rqou> but it's not set up to run any custom code at this point in time
<rqou> also, not a traditional "computer"
<rqou> actually now that i think about it i actually have quite a few
<SnoopJeDi> mother of god this sentence: "The dynamics of acceleration of a high-current particle bunch is dominated by the evolution of its 6-D phase space through the lattice of magnets and accelerating cavities, including the self-action of space charge and wake fields from the same bunch and its neighbors."
<bofh> uhm.
<bofh> "dominated by"? I feel like that's describing the entirety of the interaction of the particle >_>
<SnoopJeDi> my advisor is a really intuitive guy but he just spews when he writes something
<SnoopJeDi> thankfully I knew not to get out ahead of him too far on this draft, and instead try to slowly infect his "what the fuck did I just read" with sensible prose
<bofh> rofl
<bofh> ++
<SnoopJeDi> bofh, I know where he's coming at it from, though. When we construct Hill's equation, we're truncating an expansion of the Hamiltonian
<SnoopJeDi> and accelerator physics is largely a hodgepodge of sorta-perturbative sorta-bullshit techniques built up around understanding the other stuff in lieu of very robust analytical theories
<SnoopJeDi> and/or "fuck it throw a million macroparticles down the bore and let's see what comes out the other side"
<SnoopJeDi> the latter being largely what we've done because this machine is so hinky
<bofh> Okay, true, but those Hamiltonian expansions often contain many terms whose contribution to the system's eigenvalues is negligible and which, if left in, lend the system to be not just non-analytically-soluble but also hell to approach computationally.
<bofh> ROFL
<bofh> I approve of that approach.
<SnoopJeDi> yea so
<SnoopJeDi> it turns out that with the Hamiltonians we care about
<SnoopJeDi> there are actually proofs that they *arent* negligible
<SnoopJeDi> a lot of the time we don't run into issues with that because of beam lifetimes due to [other stuff] though, so it's a hodgepodge like I said
<SnoopJeDi> like yea I could keep this beam around without substantial loss for another 100k turns, but the emittance has gone to shit so the luminosity will suck, it's better to just beam-dump and get fresh beam
<egg> bofh: hmm how do I write the overflow-preventing rescalings for my cbrt
<SnoopJeDi> which is kind of an upsetting way to think about accelerators from the perspective of energy, but the wall-plug power you "throw away" is probably dwarfed by stuff like running the cryo and creature comforts like lighting and breathable air
<egg> !wpn whitequark
* Qboid gives whitequark a canonical asura which strongly resembles a crystal
<egg> !seen котя
<Qboid> egg: Value cannot be null.
<SnoopJeDi> !seen котяegg
<Qboid> SnoopJeDi: Value cannot be null.
<whitequark> !wpn egg
* Qboid gives egg a Balmer tesseract
<SnoopJeDi> oh from the same draft: "A PYTHON shell has been written to access those field maps in OPAL's time domain simulation."
<SnoopJeDi> [serpentine sobbing]
<egg> SNEK
<egg> Ꙩ_ꙩ
<SnoopJeDi> discovered him from a post he did about making nicely looping animations by sampling 4D noise and haven't looked back :D
<SnoopJeDi> oh actually, I lied. I'm conflating him with another artist who has a similar aesthetic in terms of color, Étienne Jacob: http://www.thisiscolossal.com/2018/04/animation-of-sinusoidal-waves-in-gifs-by-etienne-jacob/
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<egg> !choose sleep|stare at cube roots|stare at old babylonian mail
<Qboid> egg: Your options are: sleep, stare at cube roots, stare at old babylonian mail. My choice: sleep
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<awang> \o
<UmbralRaptop> o/
<UmbralRaptop> Grand canonical ensembles should not be this confusing.
<awang> Grand canonical ensembles?
<awang> Man, I missed the wonderfully obscure-ish things going on here
<UmbralRaptop> awang: I'm complaining about my stat mech homework.
<SnoopJeDi> UmbralRaptop, bah, they're just a bunch of hot air 8-)
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