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VFS_PREOPEN(8)		  System Administration	tools		VFS_PREOPEN(8)

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.

Samba 4.6			  05/23/2017			VFS_PREOPEN(8)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | VERSION | AUTHOR

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