Linux异步IO支持

绝地灬酷狼 2022-02-01 01:45 234阅读 0赞

Linux异步IO支持：

[http://www.bullopensource.org/posix/][http_www.bullopensource.org_posix]

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   <td colspan="3" style="border:1px solid #C0C0C0;border-collapse:collapse;"> <h1 style="font-size:28px;line-height:1.5;"><font>POSIX Asynchronous I/O for Linux</font></h1> </td> 
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       <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;"><img alt="pingouin" src="http://www.bullopensource.org/posix/vign3-opensource.jpg" style="border:0px;"></td> 
       <td align="center" style="border:1px solid #C0C0C0;border-collapse:collapse;">POSIX Asynchronous I/O for Linux (PAIOL) is an attempt to write a POSIX AIO compliant API based on Linux kernel 2.6 native AIO API. <p style="line-height:1.5;">This library can work without patching the kernel. Kernel patches are only needed if you want to use POSIX AIO features not available from user-space or to improve performance.</p> </td> 
       <td align="right" style="border:1px solid #C0C0C0;border-collapse:collapse;"><img alt="GNU" src="http://www.bullopensource.org/posix/meditate-tiny.jpg" style="border:0px;"></td> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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         <font>Latest News</font> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"> <img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<strong>Wed, 21 Feb 2007:</strong>&nbsp;Release 0.8.2 
        <ul style="margin-left:30px;"> 
         <li style="list-style-type:disc;">A lot of fixes both in the library code and the testcases</li> 
         <li style="list-style-type:disc;">Support for listio syscall</li> 
         <li style="list-style-type:disc;">Library is now MT safe</li> 
         <li style="list-style-type:disc;">Kernel patches ported to 2.6.20</li> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"> <img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<strong>Mon, 20 Mar 2006:</strong>&nbsp;Release 0.8 
        <ul style="margin-left:30px;"> 
         <li style="list-style-type:disc;">Fixed x86_64 implementation.</li> 
         <li style="list-style-type:disc;">Fixed testcases use of volatile variables</li> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"> <img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<strong>Mon, 7 Nov 2005:</strong>&nbsp;Release 0.7 
        <ul style="margin-left:30px;"> 
         <li style="list-style-type:disc;">Merged&nbsp;<code>IO_CMD_EVENT</code>&nbsp;and&nbsp;<code>IO_CMD_CHECKPOINT</code>&nbsp;into&nbsp;<code>IO_CMD_GROUP</code>&nbsp;for listio support.</li> 
         <li style="list-style-type:disc;">Fixed buf type from&nbsp;<code>unsigned char *</code>&nbsp;to&nbsp;<code>char *</code>&nbsp;for gcc4 in check/aio_fsync.c.</li> 
         <li style="list-style-type:disc;">Do not use the&nbsp;<code>aiocb-&gt;data</code>&nbsp;to store a pointer to the&nbsp;<code>aiocb</code>. This field was used in&nbsp;update_events()&nbsp;in src/aio_event.c to retrieve the&nbsp;<code>aiocb</code>&nbsp;from the&nbsp;<code>io_event</code>. We can instead use&nbsp;<code>event-&gt;obj</code>.</li> 
         <li style="list-style-type:disc;">Added missing comma in&nbsp;aio_syscall4&nbsp;in src/syscall_x86.h.</li> 
         <li style="list-style-type:disc;">Added&nbsp;<code>--enable-debug</code>&nbsp;option to configure for compiling the library with debug symbols. Changed configure.ac and src/Makefile.am</li> 
         <li style="list-style-type:disc;">Changed&nbsp;__aio_thread_init()&nbsp;to take a&nbsp;<code>sigevent</code>&nbsp;as arg instead of an&nbsp;<code>aiocb</code>.</li> 
         <li style="list-style-type:disc;">Added new listio testcases in check.</li> 
         <li style="list-style-type:disc;">Added support patches for the 2.6.14 kernel including Ben LaHaise's additions for request completion notification.</li> 
         <li style="list-style-type:disc;">Updated support patches for the 2.6.10 and 2.6.12 kernels.</li> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"> <img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<strong>Mon, 25 Jul 2005:</strong>&nbsp;Release 0.6 
        <ul style="margin-left:30px;"> 
         <li style="list-style-type:disc;">Fixed compilation errors when none of the kernel patches are applied i.e. no support for AIO and LIO completion signal and no support for&nbsp;io_setup (0, ...).</li> 
         <li style="list-style-type:disc;">Bug fixes concerning buffered AIO support in&nbsp;aio_read&nbsp;and&nbsp;aio_write.</li> 
         <li style="list-style-type:disc;">Fixed the type of the buffer (from&nbsp;unsigned char *&nbsp;to&nbsp;char *) used for the AIO request in a few places in testbed for consistency. These were causing compile time errors under gcc 4.0.</li> 
         <li style="list-style-type:disc;">Bug fix in kernel patches. In&nbsp;sys_io_submit, the iocb address was passed to&nbsp;create_lio&nbsp;instead of whatever the user passed in the&nbsp;sigevent sigev_value.</li> 
         <li style="list-style-type:disc;">Removed automatic checking of kernel support for buffered AIO in configure.ac. The feature must be manually enabled or disabled. Default right now is disabled.</li> 
         <li style="list-style-type:disc;">Added mini testsuite so that doing a `make check` after building the library makes sure everything is in order before installing. Currently the&nbsp;aio_fsync&nbsp;and&nbsp;aio_cancel&nbsp;checks fail due to lack of support from the kernel.</li> 
         <li style="list-style-type:disc;">Added support patches for the 2.6.12 kernel.</li> 
         <li style="list-style-type:disc;">Releases (Library and kernel patches) are now available on&nbsp;<a href="http://www.sourceforge.net/projects/paiol" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">Sourceforge</a>.</li> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"> <img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;Older news available&nbsp;<a href="http://www.bullopensource.org/posix/Old/old_news.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">here</a>.</td> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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         <font>Library - kernel patches</font> 
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       <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;">Download on&nbsp;<a href="http://www.sourceforge.net/projects/paiol" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">Sourceforge</a>.</td> 
       <td align="right" style="border:1px solid #C0C0C0;border-collapse:collapse;"><a href="http://sourceforge.net/" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="31" alt="SourceForge.net Logo" src="http://sflogo.sourceforge.net/sflogo.php?group_id=142250&amp;type=1" width="88" style="border:0px;"></a></td> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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         <font>POSIX Test Suite</font> 
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       <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/Tests/posixtestsuite-1.5.0-aio.patch.gz" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>posixtestsuite-1.5.0-aio.patch</font></a></strong></td> 
       <td style="border:1px solid #C0C0C0;border-collapse:collapse;">Udpdated AIO test suite in Open Posix Test Suite (patch now included in OPTS 1.5.1)</td> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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         <font>MySQL PAIO patch</font> 
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       <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/Bench/sysbench-oltp/mysql-aio-patch.tar.gz" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>MySQL 4.1.12 patch</font></a></strong></td> 
       <td style="border:1px solid #C0C0C0;border-collapse:collapse;">This patchset provides POSIX AIO support to the MysQL InnoDB engine.<br> The first patch in the series adds generic POSIX AIO support to the InnoDB engine. The second patch adds detection of libposix-aio for use in place of librt.</td> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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         <font>QEMU PAIO patches</font> 
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       <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/qemu/posixaio.diff" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>QEMU libposix-aio patch</font></a></strong></td> 
       <td style="border:1px solid #C0C0C0;border-collapse:collapse;">This patch allow to link qemu against libposix-aio instead of librt. It adds a parameter, "--enable-libposix-aio", to enable this feature.&nbsp;<br> &nbsp;</td> 
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       <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/qemu/ide-directio.diff" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>QEMU IDE direct I/O patch</font></a></strong></td> 
       <td style="border:1px solid #C0C0C0;border-collapse:collapse;">As memory provided to the IDE device is aligned, this patch uses it instead of internal IDE virtual device buffer.</td> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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         <font>Benchmark results</font> 
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       <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/Bench/sysbench-oltp/sysbench.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>Sysbench - oltp</font></a></strong></td> 
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         <font>Old resources</font> 
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       <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/Old/old.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>Old library releases and kernel patches</font></a></strong></td> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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         <font>Developper</font> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="mailto:Sebastien.Dugue@bull.net" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>Sébastien Dugué</font></a></strong></td> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="mailto:Laurent.Vivier@bull.net" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>Laurent Vivier</font></a>&nbsp;<a href="http://biglumber.com/Keys/pubkey.F4A7DF6BDA45573C.Laurent_Vivier.asc" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">[GPG key]</a></strong></td> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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         <font>Documentation</font> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/Documentation/README.txt" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>README</font></a></strong></td> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/Documentation/PAIOL.png" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>POSIX AIO for linux data structure</font></a>&nbsp;<a href="http://www.bullopensource.org/posix/Documentation/PAIOL.dia" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">[DIA]</a></strong></td> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><a href="http://www.bullopensource.org/posix/Documentation/lioevent.txt" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>LIOEVENT patch description</font></a></strong></td> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><strong><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>...</font></strong></td> 
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         <font>Links</font> 
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       <td colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;">&nbsp;</td> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><a href="http://lse.sourceforge.net/io/aio.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>Kernel Asynchronous I/O (AIO) Support for Linux</font></a></td> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"> <a href="http://www.opengroup.org/onlinepubs/009695399/mindex.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>The Open Group Base Specifications :</font></a> 
        <ul style="margin-left:30px;"> 
         <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/xrat/xsh_chap02.html#tag_03_02_08_06" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">AIO Rationale</a></li> 
         <li style="list-style-type:disc;"> <a href="http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_08.html#tag_02_08_02" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">AIO System Interfaces :</a> 
          <ul style="margin-left:30px;"> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/basedefs/aio.h.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">aio.h</a></li> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/functions/aio_cancel.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">aio_cancel</a></li> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/functions/aio_error.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">aio_error</a></li> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/functions/aio_fsync.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">aio_fsync</a></li> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/functions/aio_read.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">aio_read</a></li> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/functions/aio_return.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">aio_return</a></li> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/functions/aio_suspend.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">aio_suspend</a></li> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/functions/aio_write.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">aio_write</a></li> 
           <li style="list-style-type:disc;"><a href="http://www.opengroup.org/onlinepubs/009695399/functions/lio_listio.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">lio_listio</a></li> 
          </ul></li> 
        </ul></td> 
      </tr> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><a href="http://www.unix.org/version3/" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>The Single UNIX Specification, Version 3</font></a></td> 
      </tr> 
      <tr> 
       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><a href="http://people.redhat.com/~drepper/posix-option-groups.html" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>POSIX Option Groups</font></a></td> 
      </tr> 
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       <td align="left" colspan="2" style="border:1px solid #C0C0C0;border-collapse:collapse;"><a href="http://posixtest.sourceforge.net/" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow"><img height="7" alt="square" src="http://www.bullopensource.org/img/carre.jpg" width="7" style="border:0px;">&nbsp;<font>Open POSIX Test Suite</font></a></td> 
      </tr> 
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   <td align="center" style="border:1px solid #C0C0C0;border-collapse:collapse;">Page maintained by:</td> 
   <td align="left" style="border:1px solid #C0C0C0;border-collapse:collapse;"> <a href="mailto:Sebastien.Dugue@bull.net" style="color:rgb(0,0,255);text-decoration:none;" rel="nofollow">Sébastien Dugué</a>.</td> 
   <td align="center" style="border:1px solid #C0C0C0;border-collapse:collapse;"><em>Last update: 02/28/2007 22:01:19</em></td> 
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本文转自斯克迪亚博客园博客，原文链接：http://www.cnblogs.com/sgsoft/archive/2008/09/22/1295671.html，如需转载请自行联系原作者

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