hattom

@hattom@mastodon.social

Fusion plasma physicist, computational scientist.
Scientist at the Max Planck Institute for Plasma Physics (views here strictly my own).
Juggler.
He/him

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bagder, to random
@bagder@mastodon.social avatar

I was tricked into making another graph: the median/average number of lines per source file - over time (includes blanks and comments)

hattom,

@bagder What happened in 2012?

grrrr_shark, to random
@grrrr_shark@supervolcano.angryshark.eu avatar

LB: Man, I am gonna have to degoogle this phone pronto.

hattom,

@grrrr_shark I've seen "LB" a few times, but I haven't worked out exactly what it stands for

hattom,

@grrrr_shark merci. Wouldn't have got there in a month of Sundays

sundogplanets, to random
@sundogplanets@mastodon.social avatar

Oh dear lord is it actually still Monday? I had so many good conversations today with old friends and collaborators, and yelled about satellites to a room full of astronomers to try to encourage them to take action, and didn't completely melt down in a big city.

Almost have a public website ready to go with more satellite regulation advocacy info, hopefully will get it (at least bare bones version) before my public talk tomorrow!!

Mundane observation about Toronto: SO much falafel.

hattom, (edited )

@sundogplanets Mmmmmm.... Falafel... ๐Ÿง†.
Now I know what I want for dinner tonight...

elizabethtasker, to random
@elizabethtasker@mastodon.online avatar

So you know when mission development is just taking waaaaaay toooooo loooooong, so you skip straight to the movie? ๐Ÿฟ

hattom,

@elizabethtasker I'm guessing your signature isn't the "MMX" in the front-center? :)

elizabethtasker, to random
@elizabethtasker@mastodon.online avatar

Iโ€™m in the Science Museum in Londonโ€ฆ searching to find the tiny asteroid grain I smuggled in from Japan last summer!

โ€ฆ this is somewhat of a challenge. Grain is small. Museum big.

hattom,

@elizabethtasker it would be amazing if you ask a staff member about it and they replied "there's a funny story about how this train was transported..."

fanf, to random
@fanf@mendeddrum.org avatar

testing...

hattom,

@fanf migrated server?

d_yellowlees, to random
@d_yellowlees@mastodon.online avatar

There is a difference between slides designed for live delivery with a presenter and slides designed as a handout deck or to scroll by in a screen.

The first needs to be focused and minimal

The 2nd can have more on.

It's about the speed your audience has to take stuff in.

hattom,

@grrrr_shark @d_yellowlees Sometimes this is caused by the internal review/feedback processes :\
"This wasn't clear when I didn't pay attention, can you please add X, Y, Z to the slides... look, there's space in the corner of the slide!"
On the other hand, knowing that there are mixed-nationality (/ mixed-language-ability) audiences cause me to write more than I would otherwise want to for aesthetic reasons alone.

giuseppebilotta, to GraphicsProgramming

It's official now: I hate and variable frequency.

This is re: https://fediscience.org/@giuseppebilotta/111818775682992930

It might just be that I'm more proficient analyzing and working around quirks (happens, when you do mostly for more than a decade) than , but there's so many weird things happening on this machine that I don't know where to start from.

hattom,

@giuseppebilotta @jannem A couple of comments (maybe others mentioned them already).
a) If it's an MPI code (and/or launched with SLURM/srun) then note that any pinning options you want to set should probably be tested separately (I think I'm not the only problem to have had problems wtih srun --cpu-bind= and OMP_PLACES).
b) there are a number of great tools including LIKWID which can be i) informative (e.g. likwid-topology) and ii) has utils for CPU pinning (likwid-pin, likwid-mpirun).

hattom,

@giuseppebilotta @jannem IIRC, Some combination of pinning + spread should get you using cores but not logical cores, while not spanning sockets.
Of course on e.g. AMD EPYC you might want to avoid spanning CCX (or CCD? in other words sticking within a shared L3-only), and pinning to sockets is probably not enough.
The problem is perhaps with OpenMP on bare-metal if you want to span sockets/LLCs, but you care about the numbering.

hattom,

@giuseppebilotta Sorry if you said already, but what hardware are you running on?
Definitely single NUMA domain per socket?

hattom,

@giuseppebilotta I never remember, but I think main memory access (latency and bandwidth) is probably independent of CCX structure.

I guess it depends on the program as to how much effect CCX structure has:
Whether your problem fits in L3 cache, how much thread synchronization (I think it takes place via the last shared level), whether you make use of atomic updates...

ColinTheMathmo, to random
@ColinTheMathmo@mathstodon.xyz avatar

OK! Happy with this:

655

โžก๏ธโฌ‡๏ธโฌœโฌœโฌœโฌœโฌœโฌœโฌœโฌœโฌœโฌœโฌœ
โฌ†๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธโžก๏ธ

https://www.andrewt.net/puzzles/cell-tower/?p=655

However, I'm travelling internationally and got my timing wrong ... I've lost my streak 8-(

Current streak: 1 (Hydrogen)

Best streak: 93 (Neptunium)

hattom,

@rbmath @ColinTheMathmo to defend my worldle streak (but also because you can't play old ones), I'd change the timezone on my phone often enough.
Mostly a few minutes because I'd not be ready before midnight. Sometimes longer if it made it to morning when I realised.

whitequark, to random
@whitequark@mastodon.social avatar

intel's fpga division publishing a whitepaper in TYOL 2024 and the cores source trees all look like this

hattom,

@whitequark I downloaded the SLATEC numerical library again recently. I untarred the sources, and not many times had changed since '94.

vicgrinberg, (edited ) to random
@vicgrinberg@mastodon.social avatar

Wheeeee! Ich habe ein Ticket fรผr "Fremd" am Gorki Theater in Berlin ergattert! First time that getting on a waiting list for something actually worked out!

hattom,

@vicgrinberg it happens to the best of uns.

b0rk, to random
@b0rk@jvns.ca avatar

there was SO MANY great responses to my question the other day about what annoying git mistakes people make and I compiled them here: https://gist.github.com/jvns/f7d2db163298423751a9d1a823d7c7c1 (original post: https://social.jvns.ca/@b0rk/111783285691213015)

follow up question: are there any of these mistakes where you USED to make them but found a trick to avoid making the mistake that worked? what was the trick, and which mistake did it help you avoid?

(as usual, only interested in tricks that you have personally used successfully)

hattom,

@b0rk I used to worry about pushing the wrong branch upstream (or to the wrong remote. Now I almost always use the explicit form git push origin branchnameand almost never the shortergit push # and hope for the best`.

ColinTheMathmo, to random
@ColinTheMathmo@mathstodon.xyz avatar

A question for my cricket friends, and/or my Indian friends, and/or anyone who might have an answer:

Virat Kohli has "Virat" on his shirt, but is on the scoreboard as "Kohli".

OTOH, Shubman Gill has "Gill" on his short, and is on the scoreboard as "Gill".

Is there a rule somewhere that I'm missing?

hattom,

@ColinTheMathmo https://sports.stackexchange.com/a/4903
Helpful?

vicgrinberg, to random
@vicgrinberg@mastodon.social avatar

I've got time on my hands, but am in a creative funk ๐Ÿฅบ

Tell me about a telescope or satellite you want a drawing off and why? Then it may happen in the next days.

hattom,

@vicgrinberg The Lovell telescope. Every time we were nearby when I was a child, we'd try to spot it from the road, later it was the first "big science" project I ever visited (as a slightly larger child in the mid 90s).

b0rk, to random
@b0rk@jvns.ca avatar

every piece of jargon in git

(what did I miss?)

hattom,

@simontatham @b0rk as an aside, I bet I'm not the only person who often forgets
a) how many - are needed
(and b) how to spell amend)

And since, git commit -ammend is the same as git commit -a -m 'mend'... d'oh ๐Ÿคฆ.

I also bet I'm not the only person to have made this mistake multiple times ;-)

elizabethtasker, to random
@elizabethtasker@mastodon.online avatar

Anyone got a computer mic that they like? My Blue Snowball has been great, but I admit this is the second time Iโ€™ve glued it back together ๐Ÿ˜… Was thinking about getting a mic that clips onto my desk and drops down over my screen, or just getting a headset. Main use is zoom/teams (meetings and talks), chatting with family and recording voiceovers. I donโ€™t wait to pay loads, but prepared to pay above the bottom for noticeable boost in quality.

hattom,

@elizabethtasker I've been liking the directionality of a headset mic when I have any kind of background noise (some cheap 20โ‚ฌ Logitech thing).
Unnecessary for a studio, useful if noisy.

bagder, to random
@bagder@mastodon.social avatar

Starting with 8.3.0 I am going to use actual photographs as release images - primarily in my blog post and in the release video. I look forward to making many (silly) ones going forward.

I got myself a set of scrabble-like wooden pieces with numbers on to use.

Attaching an example.

hattom,

@bagder will you be skipping version 8.8.8 so that you only need 2 of each tile?

simonwood, to random
@simonwood@mastodon.social avatar

Not sure why quote marks were needed in this headlineโ€ฆ https://www.theguardian.com/uk-news/2023/aug/14/roads-agency-starts-to-undo-its-vandalism-of-victorian-bridge

hattom,

@simonwood I've noticed this on the BBC before. I can only assume that something similar is going on with the Guardian.
They use quote marks in the title when quoting someone in the article.
One assumes they think it adds gravity to the headline, but indeed common usage leads to the opposite being inferred.

vicgrinberg, to Astro
@vicgrinberg@mastodon.social avatar

I'm always blindsided by the days after US holidays: here I am, trying to drink my morning tea (the one after the coffee) with today's astro-ph and there are no archive listings for today ...

hattom,

@vicgrinberg .... only now do I notice that I didn't get a message from plasm-ph this morning. D'oh ๐Ÿคฆโ€โ™‚๏ธ

hattom, to Nvidia

Anyone know the difference between the PG506-242 and PG506-243?

Minor revision? Any differences to the technical specs?

Paging @fs395, @fabioaffinito , @jeffscience

(CC interested parties: @AlanSill, @fclc)
#GPU #nvidia #HPC

vicgrinberg, to random
@vicgrinberg@mastodon.social avatar

deleted_by_author

    •
    hattom,

    @vicgrinberg for me it's black, and preferably not anything funky e.g. earl grey/smoked/...
    Green tea is of course "proper tea", but an offer of "tea" (in my mind) wouldn't include it (I also don't like it, but that's on me -- I don't claim that there's anything wrong with it).

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