Commit 61686af to fish trunk is a large change that uses posix_spawn (when
available) for creating new processes. This is exciting stuff, because
posix_spawn is a big performance win compared to fork / exec. For example, this
loop:
for i in (seq 8000)
/usr/bin/false
end
now runs 35% faster on OS X, 40% faster on FreeBSD, and 12.5% faster on Linux.
It also reduces memory usage.
For those of you who like to build from trunk, please keep an eye out for the
following issues:
- Incorrect or vague error messages
- Weird issues with stopped processes
- Build failures on older or less popular OSes
For regression purposes, you can revert to using fork / exec by setting the
environment variable fish_use_posix_spawn to 0, and then starting a new shell.
Ideally, the only thing you'll notice is that things are faster!
_fish
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