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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    Rich Felker‏ @RichFelker 23 May 2015

    Some interesting preliminary timing of @musllibc's posix_spawn vs fork+exec shows it ~25x faster for large parent processes. (~360us vs 9ms)

    8:22 PM - 23 May 2015
    • 8 Retweets
    • 16 Likes
    • ThisIs_MyName William Hilton ██████████████████████████████████████████████████ Peter Lawrey Cosmin Ilie John Mitchell Loch Nessa Monster🌸 Franklin Hart, Jr. gab.ai/go4bender
    3 replies 8 retweets 16 likes
      1. New conversation
      2. Rich Felker‏ @RichFelker 23 May 2015
        Replying to @RichFelker

        #glibc has a vfork-based posix_spawn but it's only usable for trivial cases; others use fork. @musllibc posix_spawn always uses CLONE_VM.

        1 reply 0 retweets 1 like
      3. Rich Felker‏ @RichFelker 23 May 2015
        Replying to @RichFelker

        This also means @musllibc posix_spawn will fill the fork gap on NOMMU systems cleanly/safely (unlike vfork) once we get NOMMU working.

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. New conversation
      2. Lich in Seattle‏ @richinseattle 3 Jun 2015
        Replying to @RichFelker

        @RichFelker @musllibc @mpixorg how is the perf on fork() without exec? cygwin is 20x slower v linux native, ours is 7x slower v linux

        1 reply 0 retweets 0 likes
      3. Rich Felker‏ @RichFelker 3 Jun 2015
        Replying to @richinseattle

        @richinseattle @mpixorg Are you asking about midipix? My numbers are using @musllibc on linux.

        1 reply 0 retweets 0 likes
      4. Lich in Seattle‏ @richinseattle 3 Jun 2015
        Replying to @RichFelker

        @RichFelker @mpixorg @musllibc yes, sorry, was referring to midipix

        1 reply 0 retweets 0 likes
      5. Rich Felker‏ @RichFelker 3 Jun 2015
        Replying to @richinseattle

        @richinseattle @mpixorg While I'm excited about the midipix project, I don't work on it myself. I'm the @musllibc maintainer.

        1 reply 0 retweets 0 likes
      6. Rich Felker‏ @RichFelker 3 Jun 2015
        Replying to @RichFelker

        @richinseattle @mpixorg Just posted the posix_spawn timings link on HN because I think it's relevant to misplaced concerns about fork speed.

        1 reply 0 retweets 0 likes
      7. Lich in Seattle‏ @richinseattle 3 Jun 2015
        Replying to @RichFelker

        @RichFelker @mpixorg thanks for the clarification, I'm blind or the midipix fork implementation hasnt been released so I cant test yet

        1 reply 0 retweets 0 likes
      8. Rich Felker‏ @RichFelker 3 Jun 2015
        Replying to @richinseattle

        @richinseattle @mpixorg Indeed, the midipix runtime components are not released yet. Hopefully very soon now.

        0 replies 0 retweets 0 likes
      9. End of conversation
      1. New conversation
      2. Pádraig Brady‏ @pixelbeat_ 23 May 2015
        Replying to @RichFelker

        @RichFelker @musllibc posix_spawn (CLONE_VM) speedup is prop to mem used right? What parent size for 25x speedup? Do you have a progression?

        1 reply 0 retweets 0 likes
      3. Rich Felker‏ @RichFelker 24 May 2015
        Replying to @pixelbeat_

        @pixelbeat_ Yes. posix_spawn wins even with trivial static binary and no allocations, but the ~25x is around 40mb in small mappings.

        1 reply 0 retweets 1 like
      4. Rich Felker‏ @RichFelker 24 May 2015
        Replying to @RichFelker

        @pixelbeat_ For trivial static binary, it's 280µs vs 450µs on the system I test on.

        0 replies 0 retweets 0 likes
      5. End of conversation

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