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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 8 Oct 2018
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      I hope someday we can stop thinking of "stack" and "heap" as the two fundamentally different modes of memory allocation and instead reframe memory allocation as a continuum of strategies, from bump allocation to segregated fit to best fit to compacting, etc.

      11 replies 22 retweets 154 likes
      Show this thread
    2. David Crawshaw‏ @davidcrawshaw 8 Oct 2018
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      Replying to @pcwalton

      That would be nice, though one hurdle is statically knowing the cost of allocation. When we get something on the stack today we know statically that allocation basically is too cheap to meter. Worst case on the heap is serious CPU. Good research problem.

      1 reply 0 retweets 4 likes
    3. Andy Gocke‏ @andygocke 8 Oct 2018
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      Replying to @davidcrawshaw @pcwalton

      Worst case on the stack is blowing it. I don't think stack allocation provides any way to avoid the hard problems here.

      1 reply 0 retweets 0 likes
    4. David Crawshaw‏ @davidcrawshaw 8 Oct 2018
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      Replying to @andygocke @pcwalton

      There's lots of code I can statically verify has a maximum allocation size and that is safe to put on the stack. Especially as on some 64-bit OSs you can allocate stacks enormous address space to the stack and demand page it in. (And there are languages with growing stacks!)

      1 reply 0 retweets 0 likes
    5. Andy Gocke‏ @andygocke 8 Oct 2018
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      Replying to @davidcrawshaw @pcwalton

      I see this as basically isomorphic to a nursery, except that IME generational tends to handle growing beyond the nursery better than bouncing between stack growths

      1 reply 0 retweets 2 likes
    6. Patrick Walton‏ @pcwalton 8 Oct 2018
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      Replying to @andygocke @davidcrawshaw

      Yes, this is a very important point. People don’t realize how similar a nursery is to stack allocation.

      1 reply 0 retweets 5 likes
    7. Eyal Lotem  🏴‏ @EyalL 8 Oct 2018
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      Replying to @pcwalton @andygocke @davidcrawshaw

      Rsp += size Vs copying gc is quite a difference! Stack is far cheaper

      2 replies 0 retweets 1 like
    8. Jacob Matthews‏ @jashmatthews 8 Oct 2018
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      Replying to @EyalL @pcwalton and

      Isn't nursery allocation also just bumping a pointer by size and comparing with arena max? That's how I've made a simple implementation before.

      2 replies 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 8 Oct 2018
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      Replying to @jashmatthews @EyalL and

      Exactly.

      1:51 PM - 8 Oct 2018
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      • Jacob Matthews
      0 replies 0 retweets 1 like

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