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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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    1. 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 …

      8 replies 18 retweets 185 likes
    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. Casey Muratori‏ @cmuratori Sep 23
      Replying to @cmuratori @MemoryArenaMain

      The obvious one is VirtualLock(). In my (limited) testing, it does not improve the performance substantially.

      1 reply 0 retweets 5 likes
    5. Casey Muratori‏ @cmuratori Sep 23
      Replying to @cmuratori @MemoryArenaMain

      The non-obvious one is RIORegisterBuffer(). Although I didn't know about it last time I tested these things, it is apparently much faster. So my _assumption_ would be, if someone was going to try this on Windows, they would want to use RIORegisterBuffer().

      1 reply 0 retweets 5 likes
      Casey Muratori‏ @cmuratori Sep 23
      Replying to @cmuratori @MemoryArenaMain

      If you would like a testbed for experimenting with this on Windows, I have one posted on github that you can use. I would like to add RIORegisterBuffer() but haven't gotten around to it:https://github.com/cmuratori/largepages …

      5:46 PM - 23 Sep 2021
      • 6 Likes
      • Abhishek Cherath Ivan Braidi Zerker Radoslaw Jurga Франкфуртская школа бокса meglio
      2 replies 0 retweets 6 likes
        1. New conversation
        2. Casey Muratori‏ @cmuratori Sep 23
          Replying to @cmuratori @MemoryArenaMain

          Note tangentially that if you are running a server, you can optionally just use 2mb pages, which are always locked to physical memory by default. This is not a viable way to ship an application to consumers, but "in the cloud" you could do it, and it probably the best option.

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

          Finally, if you use RIORegisterBuffer() and it helps, be sure to thank @mmozeiko, who I believe is the person who suggested it to me. Never would have thought about it as an option otherwise.

          1 reply 0 retweets 4 likes
        4. Show replies
        1. New conversation
        2. Per Vognsen‏ @pervognsen Sep 26
          Replying to @cmuratori @MemoryArenaMain

          In the Discussion section of the readme, you say the test is less about small vs large pages than demand-driven vs upfront provisioning. That seems inconsistent with the --rio results (which is ~5% net faster for me but as expected shifts the time from writing to VirtualAlloc).

          1 reply 0 retweets 1 like
        3. Per Vognsen‏ @pervognsen Sep 26
          Replying to @pervognsen @cmuratori @MemoryArenaMain

          That is, the --rio results suggest that almost all of the 10x net win for --large is indeed coming from the large page advantage rather than the incidental upfront provisioning you also get with large pages, no?

          1 reply 0 retweets 1 like
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