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| author | bubulle <bubulle@alioth.debian.org> | 2012-06-26 14:36:50 +0000 |
|---|---|---|
| committer | bubulle <bubulle@alioth.debian.org> | 2012-06-26 14:36:50 +0000 |
| commit | ff4e46655ea945eb05e4b142a98c001e3734e8d1 (patch) | |
| tree | c01c1969f320e9bc9de0f1c057b346586f3faff2 /docs/htmldocs/manpages/vfs_aio_pthread.8.html | |
| parent | dd59b3a6064b87bdaa730e454c48588118829335 (diff) | |
| download | samba-ff4e46655ea945eb05e4b142a98c001e3734e8d1.tar.gz | |
Load samba-3.6.6 into branches/samba/upstream.upstream/3.6.6
git-svn-id: svn://svn.debian.org/svn/pkg-samba/branches/samba/upstream@4134 fc4039ab-9d04-0410-8cac-899223bdd6b0
Diffstat (limited to 'docs/htmldocs/manpages/vfs_aio_pthread.8.html')
| -rw-r--r-- | docs/htmldocs/manpages/vfs_aio_pthread.8.html | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/docs/htmldocs/manpages/vfs_aio_pthread.8.html b/docs/htmldocs/manpages/vfs_aio_pthread.8.html new file mode 100644 index 0000000000..899ff9051d --- /dev/null +++ b/docs/htmldocs/manpages/vfs_aio_pthread.8.html @@ -0,0 +1,42 @@ +<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>vfs_aio_pthread</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="vfs_aio_pthread"><a name="vfs_aio_pthread.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>vfs_aio_pthread — implement async I/O in Samba vfs using a pthread pool</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="literal">vfs objects = aio_pthread</code></p></div></div><div class="refsect1" title="DESCRIPTION"><a name="id266340"></a><h2>DESCRIPTION</h2><p>This VFS module is part of the + <a class="citerefentry" href="samba.7.html"><span class="citerefentry"><span class="refentrytitle">samba</span>(7)</span></a> suite.</p><p>The <code class="literal">aio_pthread</code> VFS module enables asynchronous + I/O for Samba on platforms which have the pthreads API available, + without using the Posix AIO interface. 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 which essentially makes Posix AIO useless on systems + using the glibc implementation.</p><p>To work around all these limitations, the aio_pthread module + was written. It uses a pthread pool instead of the + internal Posix AIO interface to allow read and write calls + to be process asynchronously. A pthread pool is created + which expands dynamically by creating new threads as work is + given to it to a maximum of 100 threads per smbd process. + To change this limit see the "aio num threads" parameter + below. New threads are not created if idle threads are + available when a new read or write request is received, + the new work is given to an existing idle thread. Threads + terminate themselves if idle for one second. + </p><p> + Note that the smb.conf parameters <code class="literal">aio read size</code> + and <code class="literal">aio write size</code> must also be set appropriately + for this module to be active. + </p><p>This module MUST be listed last in any module stack as + the Samba VFS pread/pwrite interface is not thread-safe. This + module makes direct pread and pwrite system calls and does + NOT call the Samba VFS pread and pwrite interfaces.</p></div><div class="refsect1" title="EXAMPLES"><a name="id266856"></a><h2>EXAMPLES</h2><p>Straight forward use:</p><pre class="programlisting"> + <em class="parameter"><code>[cooldata]</code></em> + <a class="link" href="smb.conf.5.html#PATH" target="_top">path = /data/ice</a> + <a class="link" href="smb.conf.5.html#AIOREADSIZE" target="_top">aio read size = 1024</a> + <a class="link" href="smb.conf.5.html#AIOWRITESIZE" target="_top">aio write size = 1024</a> + <a class="link" href="smb.conf.5.html#VFSOBJECTS" target="_top">vfs objects = aio_pthread</a> +</pre></div><div class="refsect1" title="OPTIONS"><a name="id265817"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">aio_pthread:aio num threads = INTEGER</span></dt><dd><p>Limit the maximum number of threads per smbd that + will be created in the thread pool to service IO requests. + </p><p>By default this is set to 100.</p></dd></dl></div></div><div class="refsect1" title="VERSION"><a name="id265844"></a><h2>VERSION</h2><p>This man page is correct for version 3.6.3 of the Samba suite. + </p></div><div class="refsect1" title="AUTHOR"><a name="id265854"></a><h2>AUTHOR</h2><p>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.</p></div></div></body></html> |