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Ngnghm's profile
💻🐴Ngnghm
💻🐴Ngnghm
 💻 🐴Ngnghm
@Ngnghm

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 💻 🐴Ngnghm

@Ngnghm

Welcome to the Swiftian World of Houyhnhnm Computing ("Hunam"). I am @fare's software alter ego (but see @phanaero for cryptofoo). Call me "Ann". 🐎Read my blog!

Lair of the French Resistance
ngnghm.github.io
Joined August 2015

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    1.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      At the Gambit@30 conference, Marc Feeley explains the GVM... building supercombinators for a register + stack machine using C macros with retargetable implementations... and now backends to JS, Java, PHP, asm(x86, ARM, RISCV)... 1/

      3 replies 2 retweets 11 likes
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    2.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      Each basic block declares the frame size on entry. If the exiting jump or jump/poll increases the frame size, a stack frame was allocated; if it decreases, it was deallocated. jump/poll implements a safepoint wrt stack overflow, GC and green thread scheduler. 2/

      1 reply 0 retweets 0 likes
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    3.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      The polling for interrupts only needs compare the stack pointer to a "stack limit". To force an asynchronous interrupt, just bump the stack limit; the handler will distinguish an actual stack overflow from a different kind of interrupt. 3/

      1 reply 0 retweets 0 likes
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    4.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      For the sake of first-class continuations, two extra lazy link slots are added to each new stack frame. Deallocation pops frame that weren't captured, up to the "stack base". The rest become GC fodder. For the sake of performance, frames are further aligned to 4 words. 4/

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    5.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      When your stack overflows its current "msection", memory is allocated for a new msection, and the now previous msection becomes heap. In that heap msection, the change of representation of frames from contiguous to using link slots is lazy. 5/

      1 reply 0 retweets 0 likes
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    6.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      Immediate objects have a type tag in the two lowest bits. 00 for fixnums, 10 for immediate objects, 11 for pairs, 01 for everything else. For the sake of a simpler more uniform and faster GC, pairs still have a header like other objects, and the cdr comes before the car. 6/

      1 reply 0 retweets 0 likes
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    7.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      Low 8 bits of heap object headers are 5 type bits, and 3 GC bits: permanent (never reclaimed), still (outside an msection), moveable (can be moved). For thread-safe GC, compare-and-swap is used to grab ownership of the object. 7/

      1 reply 0 retweets 0 likes
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    8.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      Gambit has a library for you to do your own Run-Time Code Generation (and calling of generated code) for x86 assembly and more. Gambit has a lot of experimental, disabled, unused features and works in progress. Projects for future students! 8/

      1 reply 0 retweets 1 like
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    9.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      Brad Lucier explains his career of numerical computations in Gambit, and making it consistently competitive with or faster than lower-level code written by hand in C or assembly.

      1 reply 2 retweets 2 likes
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    10.  💻 🐴Ngnghm‏ @Ngnghm 12 Oct 2019
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      Samuel Yvon presents Mimosa, a unikernel written in #Gambit Scheme, in which you can update the drivers while the machine is running.

      2 replies 3 retweets 5 likes
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       💻 🐴Ngnghm‏ @Ngnghm 13 Oct 2019
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      Marc Feeley explains how to migrate tasks from one machine to the other, how to serialize continuations and everything that entails, how to use a trampoline but not too often, how to avoid space leaks between the GVM and target language GC...

      8:44 AM - 13 Oct 2019
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      • Rick Dudley (afdudley.eth) Caonima
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        2.  💻 🐴Ngnghm‏ @Ngnghm 13 Oct 2019
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          Frédéric Hamel talks about Gambit's new module system, developed to solve issues with the Termite distributed system.

          1 reply 0 retweets 1 like
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        3.  💻 🐴Ngnghm‏ @Ngnghm 13 Oct 2019
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          Frédéric Hamel demonstrates hot code upgrade of distributed code and task migration to a different machine. #GambitAt30

          2 replies 1 retweet 2 likes
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        4.  💻 🐴Ngnghm‏ @Ngnghm 13 Oct 2019
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          The code was running compiled on an amd64 laptop, and was migrated to run compiled on an ARM raspi, all while running.

          2 replies 1 retweet 2 likes
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        5.  💻 🐴Ngnghm‏ @Ngnghm 13 Oct 2019
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          Vyzo presents Gerbil, his language environment on top of Gambit, with a Racket-like module and macro system.

          2 replies 0 retweets 1 like
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        6.  💻 🐴Ngnghm‏ @Ngnghm 13 Oct 2019
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          Barbara Samson and Guillaume Cartier show their portable real-time interactive 3D video and audio environments written in Jazz Scheme on top of Gambit… including an interactive spreadsheet to visualize why UDP packets have being dropped during the interaction's past. #GambitAt30

          1 reply 0 retweets 0 likes
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        7.  💻 🐴Ngnghm‏ @Ngnghm 13 Oct 2019
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          Guillaume's Jazz Scheme has its own windowing system all written in Scheme, on top of Gambit. The system does everything in OpenGL and is portable to macOS, Windows and Unix/X11, including its own self-debugging graphical debugger.

          1 reply 4 retweets 6 likes
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        8.  💻 🐴Ngnghm‏ @Ngnghm 13 Oct 2019
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          Jazz was originally written in C. Rewritten in Scheme in 2 years. The original rewrite was 80x slower than C, because it was doing too many function calls; making them macros to inline code, then adding types—and it's now faster than it was in C. And much more productive.

          1 reply 1 retweet 5 likes
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        9. End of conversation

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