On Apr 2 02:04, Martin Wege via Cygwin wrote: > Hello, > > Is there any document which describes how Cygwin and Win32 file > prefetch and readahead work, and which sizes are used (e.g. always > read one full page even if only 16 bytes are requested?)?
I'm not aware of any docs, but again, keep in mind that Cygwin is a usersapce DLL. We basically do what Windows does for low-level file access. > Quick /usr/bin/stat /etc/profile returns "IO Block: 65536". Does that > mean the file's block size is really 64k? Is this info per filesystem, > or hardcoded in Cygwin? Hardcoded in Cygwin since 2017, based on a discussion in terms of file access performance, especially when using stdio.h functions: https://cygwin.com/cgit/newlib-cygwin/commit/?id=7bef7db5ccd9c Corinna -- 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
