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diff --git a/man/systemd-readahead-done.timer.html b/man/systemd-readahead-done.timer.html index 51016d9872..e81e8c7ec5 100644 --- a/man/systemd-readahead-done.timer.html +++ b/man/systemd-readahead-done.timer.html @@ -19,20 +19,20 @@ <a href="systemd.directives.html">Directives </a>· <a href="../python-systemd/index.html">Python </a>· <a href="../libudev/index.html">libudev </a>· - <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 204</span><hr><div class="refentry"><a name="systemd-readahead-replay.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-readahead-replay.service, systemd-readahead-collect.service, systemd-readahead-done.service, systemd-readahead-done.timer, systemd-readahead — Disk read ahead logic</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-readahead-replay.service</code></p><p><code class="filename">systemd-readahead-collect.service</code></p><p><code class="filename">systemd-readahead-done.service</code></p><p><code class="filename">systemd-readahead-done.timer</code></p><div class="cmdsynopsis"><p><code class="command">/usr/lib/systemd/systemd-readahead/systemd-readahead</code> [OPTIONS...] COMMAND [DIRECTORY | FILE]</p></div></div><div class="refsect1"><a name="idm259772642912"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-readahead-collect.service</code> + <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 208</span><hr><div class="refentry"><a name="systemd-readahead-replay.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-readahead-replay.service, systemd-readahead-collect.service, systemd-readahead-done.service, systemd-readahead-done.timer, systemd-readahead — Disk read ahead logic</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-readahead-replay.service</code></p><p><code class="filename">systemd-readahead-collect.service</code></p><p><code class="filename">systemd-readahead-done.service</code></p><p><code class="filename">systemd-readahead-done.timer</code></p><div class="cmdsynopsis"><p><code class="command">/usr/lib/systemd/systemd-readahead/systemd-readahead</code> [OPTIONS...] COMMAND [DIRECTORY | FILE]</p></div></div><div class="refsect1"><a name="idm274684861104"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-readahead-collect.service</code> is a service that collects disk usage patterns at boot time. <code class="filename">systemd-readahead-replay.service</code> is a service that replays this access data collected at the subsequent boot. Since disks tend to be - magnitudes slower than RAM this is intended to improve + magnitudes slower than RAM, this is intended to improve boot speeds by pre-loading early at boot all data on disk that is known to be read for the complete boot process.</p><p><code class="filename">systemd-readahead-done.service</code> is executed a short while after boot completed and signals <code class="filename">systemd-readahead-collect.service</code> - to end data collection. On this signal this service + to end data collection. On this signal, this service will then sort the collected disk accesses and store - information about them disk in + information about them in <code class="filename">/.readahead</code>.</p><p>Normally, both <code class="filename">systemd-readahead-collect.service</code> and @@ -40,34 +40,34 @@ are activated at boot so that access patterns from the preceding boot are replayed and new data collected for the subsequent boot. However, on read-only media - where the collected data cannot be stored it might + where the collected data cannot be stored, it might be a good idea to disable <code class="filename">systemd-readahead-collect.service</code>.</p><p>On rotating media, when replaying disk accesses - at early boot + at early boot, <code class="filename">systemd-readahead-replay.service</code> will order read requests by their location on disk. On non-rotating media, they will be ordered by their original access timestamp. If the file system supports - it + it, <code class="filename">systemd-readahead-collect.service</code> will also defragment and rearrange files on disk to - optimize subsequent boot times.</p></div><div class="refsect1"><a name="idm259772632032"></a><h2 id="Options">Options<a class="headerlink" title="Permalink to this headline" href="#Options">¶</a></h2><p><code class="filename">systemd-readahead</code> understands + optimize subsequent boot times.</p></div><div class="refsect1"><a name="idm274688754352"></a><h2 id="Options">Options<a class="headerlink" title="Permalink to this headline" href="#Options">¶</a></h2><p><code class="filename">systemd-readahead</code> understands the following options:</p><div class="variablelist"><dl class="variablelist"><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h">¶</a></dt><dd><p>Prints a short help text and exits.</p></dd><dt id="--max-files="><span class="term"><code class="option">--max-files=</code></span><a class="headerlink" title="Permalink to this term" href="#--max-files=">¶</a></dt><dd><p>Maximum number of files to read ahead. Only valid for thes <span class="command"><strong>collect</strong></span> command.</p></dd><dt id="--file-size-max="><span class="term"><code class="option">--file-size-max=</code></span><a class="headerlink" title="Permalink to this term" href="#--file-size-max=">¶</a></dt><dd><p>Maximum size of files - (in bytes) to read ahead. Only valid + in bytes to read ahead. Only valid for the <span class="command"><strong>collect</strong></span> and <span class="command"><strong>replay</strong></span> - commands.</p></dd><dt id="--timeout="><span class="term"><code class="option">--timeout=</code></span><a class="headerlink" title="Permalink to this term" href="#--timeout=">¶</a></dt><dd><p>Maximum time (in usec) - to to spend collecting data. Only valid + commands.</p></dd><dt id="--timeout="><span class="term"><code class="option">--timeout=</code></span><a class="headerlink" title="Permalink to this term" href="#--timeout=">¶</a></dt><dd><p>Maximum time in microseconds + to spend collecting data. Only valid for the <span class="command"><strong>collect</strong></span> - command.</p></dd></dl></div></div><div class="refsect1"><a name="idm259776575328"></a><h2 id="Commands">Commands<a class="headerlink" title="Permalink to this headline" href="#Commands">¶</a></h2><p>The following commands are understood by + command.</p></dd></dl></div></div><div class="refsect1"><a name="idm274688742560"></a><h2 id="Commands">Commands<a class="headerlink" title="Permalink to this headline" href="#Commands">¶</a></h2><p>The following commands are understood by <code class="filename">systemd-readahead</code>:</p><div class="variablelist"><dl class="variablelist"><dt id="collect [DIRECTORY]"><span class="term"><span class="command"><strong>collect [<em class="replaceable"><code>DIRECTORY</code></em>]</strong></span></span><a class="headerlink" title="Permalink to this term" href="#collect%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%5BDIRECTORY%5D">¶</a></dt><dd><p>Collect read-ahead data on - early boot. When terminating it will + early boot. When terminating, it will write out a pack file to the indicated directory containing the read-ahead data. </p></dd><dt id="replay @@ -77,10 +77,10 @@ [FILE]"><span class="term"><span class="command"><strong>analyze [<em class="replaceable"><code>FILE</code></em>]</strong></span></span><a class="headerlink" title="Permalink to this term" href="#analyze%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%5BFILE%5D">¶</a></dt><dd><p>Dumps the content of the read-ahead pack file to the - terminal. The output lists - approximately for each file - how much will be read-ahead by + terminal. For each file, the + output lists approximately how + much will be read ahead by the <span class="command"><strong>replay</strong></span> - command.</p></dd></dl></div></div><div class="refsect1"><a name="idm259776557232"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> + command.</p></dd></dl></div></div><div class="refsect1"><a name="idm274688724480"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a> </p></div></div></body></html> |