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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. Tyler Glaiel‏Verified account @TylerGlaiel Jun 10

      is there an easy way in C++ to just allocate a page of memory?

      2 replies 0 retweets 10 likes
    2. Tim Dierks‏ @CptnTimberTim Jun 10
      Replying to @TylerGlaiel

      Tim Dierks Retweeted Casey Muratori

      Didn't @cmuratori tweet about memory allocation and page sizes recently? I think this may the tweet I mean:https://twitter.com/cmuratori/status/1392559189227053056 …

      Tim Dierks added,

      Casey Muratori @cmuratori
      For people interested in the 4k (demand paged) and 2mb (locked physical) page provisioning I've been tweeting about, I have posted an example program if you'd like to play around with it: https://github.com/cmuratori/largepages … Do let me know if you find anything interesting, bugs, etc.
      1 reply 0 retweets 0 likes
    3. Tyler Glaiel‏Verified account @TylerGlaiel Jun 10
      Replying to @CptnTimberTim @cmuratori

      I'll take a look. plopped on a custom allocator for a few things recently and it does seem to be a *significant* improvement in a few situations. curious if it would be better if I could just get entire pages instead of using malloc for the underlying buffer

      1 reply 0 retweets 0 likes
    4. Tim Dierks‏ @CptnTimberTim Jun 10
      Replying to @TylerGlaiel @cmuratori

      I think the gist of it is that 4k pages are still recommended over the 2mb, even in the year 2021 >_>. And I do that with VirtualAlloc on windows.

      1 reply 0 retweets 0 likes
    5. Tyler Glaiel‏Verified account @TylerGlaiel Jun 10
      Replying to @CptnTimberTim @cmuratori

      ya I think I would be allocating dozens to hundreds of 4k pages so I'm guessing it kind of doesnt matter if I get them through malloc or not then...

      1 reply 0 retweets 0 likes
    6. Casey Muratori‏ @cmuratori Jun 10
      Replying to @TylerGlaiel @CptnTimberTim

      VirtualAlloc is how you allocate pages of memory on Windows. mmap would be the equivalent on Linux. malloc/new should generally be avoided unless you actually want a bunch of questionable code trying to coalesce freed blocks for you.

      1 reply 0 retweets 9 likes
      Casey Muratori‏ @cmuratori Jun 10
      Replying to @cmuratori @TylerGlaiel @CptnTimberTim

      (BTW, if you use these, you get the bonus that in debug mode, you can specify the addresses you're allocating - which means they can be the same across runs - which means you can save and restore memory across runs _with pointers in it_ and it will work!)

      7:58 PM - 10 Jun 2021
      • 12 Likes
      • bc1n0 Bjarke Andy Robbins desolot Ivan Braidi Lior David γper Sharundaar
      1 reply 0 retweets 12 likes
        1. Tyler Glaiel‏Verified account @TylerGlaiel Jun 10
          Replying to @cmuratori @CptnTimberTim

          true, I actually disable my allocators in debug mode (with a flag, optionally) since mine won't know if you double free or whatever, and I kind of want to know that immediately. also only currently using them for a few things, malloc still gets hit up a bunch in other places :/

          0 replies 0 retweets 1 like
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