On Fri, Feb 3, 2012 at 1:20 PM, Christian Franke <christian.fra...@t-online.de> 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? >
Yes. > 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, ... > Yes it would break my use of this feature. > Another more flexible solution would be a mount option to configure this. > (xguess=0: no check; 1: some extensions only; 2: all files) > The default should be the existing behavior. -- Earnie -- https://sites.google.com/site/earnieboyd -- 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
