4 ms·

Can't you use posix_spawn() with WSL and your favorite POSIX-compatible libc implementation?

• Dylan16807 8y ago
  Well that's a complicated question to answer. You can use the posix_spawn function in glibc, which uses a vfork or clone syscall just like on Linux.
  • acqq 8y ago
    Also relevant, regarding the Linux native performance: https://mobile.twitter.com/RichFelker/status/602313979894038528 https://mobile.twitter.com/RichFelker/status/602313979894038... "Rich Felker, May 24, 2015: Some interesting preliminary timing of @musllibc 's posix_spawn vs fork+exec shows it ~25x faster for large parent processes. (~360us vs 9ms). #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. This also means @musllibc posix_spawn will fill the fork gap on NOMMU systems cleanly/safely (unlike vfork) once we get NOMMU working." Also evilotto's post here: https://news.ycombinator.com/item?id=19622477 https://news.ycombinator.com/item?id=19622477 "a 100mb process generally takes >2ms to fork, while a 1mb or less process takes 70us"
    • Dylan16807 8y ago
      Glibc got its main clone-based implementation in 2016, so it should be much more competitive now.
    • JdeBP 8y ago
      See also https://news.ycombinator.com/item?id=18073906 https://news.ycombinator.com/item?id=18073906 .