NAME

       vfs_preopen - Hide read latencies for applications reading numbered files

SYNOPSIS

       vfs objects = preopen

DESCRIPTION

       This VFS module is part of the samba(7) suite.

       This module assists applications that want to read numbered files in sequence with very
       strict latency requirements. One area where this happens in video streaming applications
       that want to read one file per frame.

       When you use this module, a number of helper processes is started that speculatively open
       files and read a number of bytes to prime the file system cache, so that later on when the
       real application's request comes along, no disk access is necessary.

       This module is stackable.

OPTIONS

       preopen:names = /pattern/
           preopen:names specifies the file name pattern which should trigger the preopen helpers
           to do their work. We assume that the files are numbered incrementally. So if your file
           names are numbered FRAME00000.frm FRAME00001.frm and so on you would list them as
           preopen:names=/FRAME*.frm/

       preopen:num_bytes = BYTES
           Specifies the number of bytes the helpers should speculatively read, defaults to 1.

       preopen:helpers = NUM-PROCS
           Number of forked helper processes, defaults to 1.

       preopen:queuelen = NUM-FILES
           Number of files that should be speculatively opened. Defaults to the 10 subsequent
           files.

VERSION

       This man page is correct for version 3.3 of the Samba suite.

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba
       is now developed by the Samba Team as an Open Source project similar to the way the Linux
       kernel is developed.

       The PREOPEN VFS module was created with contributions from Volker Lendecke and the
       developers at IBM.