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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    1. Tim Sweeney‏ @TimSweeneyEpic 25 Jul 2018
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      This is the holy grail for lightweight synchronization of millions of small operations with heavy infrequent operations like garbage collection:https://docs.microsoft.com/en-us/windows/desktop/api/processthreadsapi/nf-processthreadsapi-flushprocesswritebuffers …

      4 replies 6 retweets 86 likes
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    2. Tom Forsyth‏ @tom_forsyth 25 Jul 2018
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      Replying to @TimSweeneyEpic

      Er... you don't need this on x86. Writes are visible the instant they're done (arguably before, since the line must be in M or E for the write to even happen, which means the core must own it and nobody else can).

      2 replies 0 retweets 4 likes
      Tim Sweeney‏ @TimSweeneyEpic 25 Jul 2018
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      Replying to @tom_forsyth

      On x86, this enables one heavyweight operation to establish an epoch and ensure that all threads running lightweight operations have recognized on it, without those lightweight operations using slow interlocked atomics - important if there are 100M’s per second of the later.

      1:51 PM - 25 Jul 2018
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      • 5 Likes
      • A Mysterious stranger; no, not that one Jeremie Pelletier Anton Gustavsson Stefan Boberg Sebastian Sylvan
      2 replies 1 retweet 5 likes
        1. François Piednoël  🇫🇷 🗽 🇺🇸‏ @FPiednoel 25 Jul 2018
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          Replying to @TimSweeneyEpic @tom_forsyth

          The Protocol on Intel x86 platform (QPI subset used on the rings) does take care of most of this, but it would be nice to have the OS informing this subsystem better. That could become in inform write combining.

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        2. Sebastian Sylvan‏ @ssylvan 25 Jul 2018
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          Replying to @TimSweeneyEpic @tom_forsyth

          Ah, nice! Could be used for non-GC epoch based reclamation too I guess I.e. instead of calling "delete" on objects from a MT queue, you attach it to the current epoch, then 2 epochs later they get deleted (this flush = per-thread "current epoch" index does not need to be atomic).

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        3. Sebastian Sylvan‏ @ssylvan 25 Jul 2018
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          Replying to @ssylvan @TimSweeneyEpic @tom_forsyth

          Probably only worth it if you have a ton of things that use the same epoch reclaimer system, which may in practice mean it's only nice for GC?

          1 reply 0 retweets 0 likes
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