On Thu, Apr 20, 2023 at 03:14:59AM -0400, gs-cygwin....@gluelogic.com wrote: > On Mon, Apr 17, 2023 at 08:44:51PM +0200, Bruno Haible via Cygwin wrote: > > Btw, there are two more functions in the posix_spawn family meanwhile: > > * posix_spawn_file_actions_addchdir_np > > implemented by glibc [1], musl libc, macOS, FreeBSD [2], Solaris ≥ 11.3 > > used by a few packages (Firefox, Chromium, Rust) > > * posix_spawn_file_actions_addfchdir_np > > implemented in glibc, musl libc > > but not used by any package so far [3]. > > > > The next POSIX will contain these functions (without the _np suffix).[4] > > > > Bruno > > > > [1] https://sourceware.org/bugzilla/show_bug.cgi?id=17405 > > [2] > > https://man.freebsd.org/cgi/man.cgi?query=posix_spawn_file_actions_adddup2&apropos=0&sektion=3&manpath=FreeBSD+11-current&format=html > > [3] https://codesearch.debian.net/ > > [4] https://www.austingroupbugs.net/view.php?id=1208 > > With regards to [3] above, the next lighttpd release (lighttpd 1.4.70) > will use posix_spawn_file_actions_addfchdir_np(), where available, for > spawning CGI programs. > > I have not yet tested under cygwin, but under Linux the overhead of > initial CGI process creation can be greatly reduced by using > posix_spawn() instead of fork(),execve(). The speedup is inversely > proportional to how much work the target script performs (compared to > the overhead of initial process creation). On x86_64 Linux, running a > minimal C program for CGI can be ~60% faster in lighttpd when using > posix_spawn()! When running a minimal /bin/sh program for CGI, the > speedup is "only" ~20%! (Those numbers were obtained from running > h2load and weighttp microbenchmarks with the minimal CGI programs.) > > minimal C program for CGI (compiled gcc -O3): > #include <unistd.h> > static const char resp[] = "Status: 200\n\n"; > int main(void) { write(STDOUT_FILENO, resp, sizeof(resp)-1); return 0; } > > minimal /bin/sh program for CGI: > #!/bin/sh > printf 'Status: 200\n\n' > > Cheers, Glenn
lighttpd 1.4.70 has been released for cygwin and uses posix_spawn() when running CGI programs. Under cygwin 3.4.0, posix_spawn_file_actions_addfchdir_np() is not detected and so not used, but once cygwin 3.5.0 is out, I'll rebuild the lighttpd package on cygwin to take advantage of it. Cheers, Glenn -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
