strace -o strace.log dirname -- /some/path/here There are 2 points that could make it significantly faster and shouldn't be too hard to implement?
1) A significant amount of time is spent on user auth (as seen in various github issues the infamous /etc/passwd nsswitch.conf fix) Wouldn't it be possible to just reuse the auth data from the current shell for the subshell, e.g. for basename -- $(dirname -- /some/path/here) 2) why are unix/dos path conversions of environment variables not cached? A significant amount of time (15-30%, depending on the number of environment variables) is spent on the conversion for every invocation. However, this would be extremely simple to cache and reusable even on completely unrelated subshells. cache key = original path cache value = converted value e.g. ``` 44 12839 [main] dirname 16929 mount_info::conv_to_posix_path: conv_to_posix_path (C:\Users\User123\bin, 0x10000100, no-add-slash) 44 12883 [main] dirname 16929 normalize_win32_path: C:\Users\User123\bin = normalize_win32_path (C:\Users\User123\bin) 44 12927 [main] dirname 16929 mount_info::conv_to_posix_path: mount[0] .. checking / -> C:\Program Files\Git 44 12971 [main] dirname 16929 mount_info::conv_to_posix_path: mount[1] .. checking /bin -> C:\Program Files\Git\usr\bin 44 13015 [main] dirname 16929 mount_info::conv_to_posix_path: mount[2] .. checking /tmp -> C:\Users\User123\AppData\Local\Temp 44 13059 [main] dirname 16929 mount_info::conv_to_posix_path: /c/Users/User123/bin = conv_to_posix_path (C:\Users\User123\bin) ``` could be cached with key C:\Users\User123\bin and value /c/Users/User123/bin at least for the current process (e.g. a bash script and it's children) without risking any noticeable outdated cache issues (probably even longer, however we want to keep it simple and don't want to worry about cache invalidation too much) -- Problem reports: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
