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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    Casey Muratori‏ @cmuratori Sep 23

    One of the Unity developers raised some important points about WASM's memory model in a github thread. I contributed some additional thoughts here:https://github.com/WebAssembly/design/issues/1397#issuecomment-926119051 …

    1:27 PM - 23 Sep 2021
    • 18 Retweets
    • 185 Likes
    • manish juneja Hal Wayland Vivitsu Maharaja bassfault PabloLlamaLang γper Antonio CS Omid Ghavami Zeitooni Alex García
    8 replies 18 retweets 185 likes
      1. RKD 🇷🇺 🇮🇱‏ @RatKnightDev Sep 23
        Replying to @cmuratori

        Interesting stuff

        0 replies 0 retweets 1 like
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      2. Stefan Reinalter‏ @molecularmusing Sep 23
        Replying to @cmuratori

        Regarding circular ring buffer mapping, I think this is not even 100% guaranteed to work on Windows, or did something change in that regard?

        1 reply 0 retweets 1 like
      3. Stefan Reinalter‏ @molecularmusing Sep 23
        Replying to @molecularmusing @cmuratori

        To improve on my wording: it is subject to race conditions as far as I'm aware, but you can usually get what you want by retrying often enough. It's just that the Win32 API doesn't provide a way to map both parts atomically, unless they added an API recently.

        1 reply 0 retweets 1 like
      4. Show replies
      1. Stéphane Cocquereaumont‏ @stephc_int13 Sep 23
        Replying to @cmuratori

        100% agree here. And also think that what you wrote could be a good introduction to modern (64 bit systems) low-level memory management layer for games.

        0 replies 0 retweets 1 like
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      2. Ryan‏ @MemoryArenaMain Sep 23
        Replying to @cmuratori

        "there are calls available that will map committed virtual pages to actual physical pages in bulk" Is there a way to do this on Windows?

        1 reply 0 retweets 2 likes
      3. Casey Muratori‏ @cmuratori Sep 23
        Replying to @MemoryArenaMain

        Yes, there are two ways - one obvious and one not obvious :)

        1 reply 0 retweets 3 likes
      4. Show replies
      1. Jimmy‏ @iEnjoyfreeBacon Sep 23
        Replying to @cmuratori

        I enjoyed ready this thread

        0 replies 0 retweets 1 like
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      2. Eric Lasota‏ @EricLasota Sep 23
        Replying to @cmuratori

        I don't think this is really a problem for stack frames. You can solve the stack frame problem by just using chained memory regions instead of a single region and having 2 stack pointers (current+caller).

        1 reply 0 retweets 2 likes
      3. Casey Muratori‏ @cmuratori Sep 23
        Replying to @EricLasota

        Chaining the memory regions does not "solve" the problem, because it is literally the chaining which is the problem. The point of modern 64-bit address spaces is that you no longer have to do this, because the CPU does it for you. I explained all this in detail in the post:pic.twitter.com/NgkdYb6Bgd

        0 replies 1 retweet 13 likes
      4. End of conversation
      1. New conversation
      2. David‏ @David_Pet Sep 24
        Replying to @cmuratori

        Didn't know you were interested in WASM. Do you think it is worth spending time learning it? Too early? Too crap?

        3 replies 0 retweets 0 likes
      3. Jonas Lund‏ @perjonaslund Sep 24
        Replying to @David_Pet @cmuratori

        WASM is great in ways, yet it’s lineage is JS (that was a hack initially), then Asm.JS (that was a clever hack upon it to solve a problem and force browser vendors hand to support it) that then was built to be backwards compatible with the previous 2 hacks (to force buy-in)

        0 replies 0 retweets 0 likes
      4. End of conversation

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