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authorVolker Lendecke <vl@samba.org>2009-03-10 18:02:21 +0100
committerVolker Lendecke <vl@samba.org>2009-03-10 18:11:56 +0100
commit3d280639c4652d6cd35577e333bcd46c2517754c (patch)
tree33fc79b0908db0807deec4c700d4fedea4be085c /docs-xml/manpages-3
parent66a26a0ac27462361cb94e3ef1744d275bd95da1 (diff)
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Add a vfs_preopen module to hide fs latencies
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+<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
+<refentry id="vfs_preopen.8">
+
+<refmeta>
+ <refentrytitle>vfs_preopen</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="source">Samba</refmiscinfo>
+ <refmiscinfo class="manual">System Administration tools</refmiscinfo>
+ <refmiscinfo class="version">3.3</refmiscinfo>
+</refmeta>
+
+<refnamediv>
+ <refname>vfs_preopen</refname>
+ <refpurpose>Hide read latencies for applications reading numbered files</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+ <cmdsynopsis>
+ <command>vfs objects = preopen</command>
+ </cmdsynopsis>
+</refsynopsisdiv>
+
+<refsect1>
+ <title>DESCRIPTION</title>
+
+ <para>This VFS module is part of the
+ <citerefentry><refentrytitle>samba</refentrytitle>
+ <manvolnum>7</manvolnum></citerefentry> suite.</para>
+
+ <para>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.</para>
+
+ <para>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.</para>
+
+ <para>This module is stackable.</para>
+
+</refsect1>
+
+
+<refsect1>
+ <title>OPTIONS</title>
+
+ <variablelist>
+
+ <varlistentry>
+ <term>preopen:names = /pattern/</term>
+ <listitem>
+ <para>
+ 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 <command>preopen:names=/FRAME*.frm/</command>
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>preopen:num_bytes = BYTES</term>
+ <listitem>
+ <para>
+ Specifies the number of bytes the helpers should speculatively
+ read, defaults to 1.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>preopen:helpers = NUM-PROCS</term>
+ <listitem>
+ <para>
+ Number of forked helper processes, defaults to 1.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>preopen:queuelen = NUM-FILES</term>
+ <listitem>
+ <para>
+ Number of files that should be speculatively opened. Defaults
+ to the 10 subsequent files.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+</refsect1>
+
+<refsect1>
+ <title>VERSION</title>
+ <para>This man page is correct for version 3.3 of the Samba suite.
+ </para>
+</refsect1>
+
+<refsect1>
+ <title>AUTHOR</title>
+
+ <para>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.</para>
+
+ <para>The PREOPEN VFS module was created with contributions from
+ Volker Lendecke and the developers at IBM.
+ </para>
+</refsect1>
+
+</refentry>