state of a typical C compiler, 1998
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@joe we can see exactly how it happens
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@joe the heck is -!0
@ratsnakegames not much, what’s -! With you
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state of a typical C compiler, 1998
@joe "Twenty-minute compile time" is so perfect and understated
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@joe "Twenty-minute compile time" is so perfect and understated
@joe of course with modern OOO processors this would be like 0.2 seconds and would go unnoticed
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@joe of course with modern OOO processors this would be like 0.2 seconds and would go unnoticed
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@joe of course with modern OOO processors this would be like 0.2 seconds and would go unnoticed
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@cr1901 singularity (1 million parentheses)
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state of a typical C compiler, 1998
@joe "several compiler crashes"
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@joe "several compiler crashes"
@joe crashing multiple times in a single run implies some advanced error handling
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@joe of course with modern OOO processors this would be like 0.2 seconds and would go unnoticed
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state of a typical C compiler, 1998
@joe@f.duriansoftware.com okay I'm curious about the original source for this and the reason as to why these happen. Some are obvious but how does
if (sizeof(char)+d) f(d)cause an illegal instruction to be emitted? -
wild to think how 1989-1999 went from 33MHz pipelined in-order scalar to 500MHz out-of-order superscalar, 1999 to 2004 went to like 3GHz from there, and then 2004 to 2014 was "oh boy, hair shirt time"
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@joe of course with modern OOO processors this would be like 0.2 seconds and would go unnoticed
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@joe@f.duriansoftware.com okay I'm curious about the original source for this and the reason as to why these happen. Some are obvious but how does
if (sizeof(char)+d) f(d)cause an illegal instruction to be emitted?@tay I put a link to the paper in the alt text: https://www.cs.swarthmore.edu/~bylvisa1/cs97/f13/Papers/DifferentialTestingForSoftware.pdf
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@tay I put a link to the paper in the alt text: https://www.cs.swarthmore.edu/~bylvisa1/cs97/f13/Papers/DifferentialTestingForSoftware.pdf
For example, the server crash occurred when the tested compiler got a stack overflow on a heavily loaded machine with a very large memory. The operating system attempted to dump a gigabyte of compiler stack, which caused all the other active users to thrash, and many of them also dumped for lack of memory. The many disk drives on the server began a dance of the lights that sopped up the remaining free resources, causing the operators to boot the server to recover. Excellent testing can make you unpopular with almost everyone.
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Gli ultimi otto messaggi ricevuti dalla Federazione
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@anfangel.bsky.social
Uì, ciao
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Bruce LaBruce (@brucelabruce.bsky.social)
https://bsky.app/profile/brucelabruce.bsky.social/post/3mgv5p4uqy227
> HBD to the wonderful Barbara Feldon, who so stylishly and elegantly played Agent 99 on the 60's TV series "Get Smart," BOTD in 1933, turning 93 today! Here's hoping that she lives to be at least 99!!
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Algorithms, by Jeff Erickson
#coding #programming #foss #books
https://jeffe.cs.illinois.edu/teaching/algorithms/
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@Alberto però mi ricordo che qualcuno li provò, forse Pippo, e stette male...
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@mariosiniscalchi temo di essermi espresso male. Intendevo dire "essere rappresentati NEL CSM", perché, appunto è il loro organo di autogoverno e penso abbiano diritto a farne parte scegliendo chi ci deve stare e non affidandosi al caso.
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Mapping The Sound Field Of An Acoustic Levitator
Sound! It’s a thing you hear, moreso than something you see with your eyes. And yet, it is possible to visualize sound with various techniques. [PlasmatronX] demonstrates this well, using a special scanning technique to visually capture the sound field inside an acoustic levitation device.
If you’re unfamiliar, acoustic levitation devices like this use ultrasound to create standing waves that can hold small, lightweight particles in mid-air. The various nodes of the standing wave are where particles will end up hovering. [PlasmatronX] was trying to calibrate such a device, but it proved difficult without being able to see what was going on with the sound field. Hence, the desire to image it!
Imaging the sound field was achieved with a Schlieren optical setup, which can capture variations in air density as changes in brightness in an image. Normally, Schlieren imaging only works in a two-dimensional slice. However, [PlasmatronX] was able to lean on computed tomography techniques to create a volumetric representation of the sound field in 3D. He refers to this as “computerized acoustical tomography.” Images were captured of the acoustic levitation rig from different angles using the Schlieren optics rig, and then the images were processed in Python to recreate a 3D image of the sound field.
We’ve seen some other entertaining applications of computed tomography techniques before, like inspecting packets of Pokemon cards. Video after the break.
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My youngest dog always walks around the house and back yard like he's ancient. Like, wobbling along like he's in pain, kinda limping. But, when we're on a walk or he's off-lead in the forest, he's like a rocket, absolutely full-tilt 100% of the time, not a care in the world, no think just run. No trace of a limp, seemingly no problems.
I think he's just really lazy when he's somewhere boring? Like a sullen teenager ambling through the halls at school.
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Al posto di Gassman per interpretare l'avvocato Guerrieri sarebbe stato meglio
