On Feb 3 19:20, Christian Franke wrote: > Cygwin stat() may be much slower on noacl mounts than on acl > mounts.This is because on noacl mounts the x-permission bit is > guessed by checking for "#!", ":" or "MZ" in the first bytes of the > file. AFAIKS this is done for all files except *.exe, *.lnk and > *.com. > > A real world testcase with 20120201 snapshot on a (C++/Java > development) tree with ~52000 files in ~12000 dirs: > > . noacl acl > find -size ... (after boot) 518s 51s > find -size ... (disk cached) 13s 8s > find -name ... (disk cached) 3s 3s (does not need stat()) > > Is it really needed to do the header check for each file? > > Would it break important use cases if the check is only done for > files with typical script file extensions? > For example: no extension, .sh, .csh, .pl, .py, ... > > Another more flexible solution would be a mount option to configure this. > (xguess=0: no check; 1: some extensions only; 2: all files)
We already have the exec/notexec/cygexec mount options, see http://cygwin.com/cygwin-ug-net/using.html#mount-table Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
