mirror of
https://github.com/samba-team/samba.git
synced 2024-12-23 17:34:34 +03:00
eae6d76a36
writing that they are correct for version x is not always precise. But we're working on that also :-) Signed-off-by: Bjoern Jacke <bjacke@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Garming Sam <garming@catalyst.net.nz>
87 lines
2.5 KiB
XML
87 lines
2.5 KiB
XML
<?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_aio_fork.8">
|
|
|
|
<refmeta>
|
|
<refentrytitle>vfs_aio_fork</refentrytitle>
|
|
<manvolnum>8</manvolnum>
|
|
<refmiscinfo class="source">Samba</refmiscinfo>
|
|
<refmiscinfo class="manual">System Administration tools</refmiscinfo>
|
|
<refmiscinfo class="version">&doc.version;</refmiscinfo>
|
|
</refmeta>
|
|
|
|
|
|
<refnamediv>
|
|
<refname>vfs_aio_fork</refname>
|
|
<refpurpose>implement async I/O in Samba vfs</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<cmdsynopsis>
|
|
<command>vfs objects = aio_fork</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>The <command>aio_fork</command> VFS module enables async
|
|
I/O for Samba on platforms where the system level Posix AIO
|
|
interface is insufficient. Posix AIO can suffer from severe
|
|
limitations. For example, on some Linux versions the
|
|
real-time signals that it uses are broken under heavy load.
|
|
Other systems only allow AIO when special kernel modules are
|
|
loaded or only allow a certain system-wide amount of async
|
|
requests being scheduled. Systems based on glibc (most Linux
|
|
systems) only allow a single outstanding request per file
|
|
descriptor. </para>
|
|
|
|
<para>To work around all these limitations, the aio_fork module
|
|
was written. It uses forked helper processes instead of the
|
|
internal Posix AIO interface to create asynchronousity for
|
|
read and write calls. It has no parameters, it will create
|
|
helper processes when async requests come in as needed. Idle
|
|
helper processes will be removed every 30 seconds.
|
|
</para>
|
|
|
|
<para>This module is stackable.</para>
|
|
|
|
</refsect1>
|
|
|
|
|
|
<refsect1>
|
|
<title>EXAMPLES</title>
|
|
|
|
<para>Straight forward use:</para>
|
|
|
|
<programlisting>
|
|
<smbconfsection name="[cooldata]"/>
|
|
<smbconfoption name="path">/data/ice</smbconfoption>
|
|
<smbconfoption name="vfs objects">aio_fork</smbconfoption>
|
|
</programlisting>
|
|
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>VERSION</title>
|
|
|
|
<para>This man page is part of version &doc.version; 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>
|
|
|
|
</refsect1>
|
|
|
|
</refentry>
|