diff options
Diffstat (limited to 'man/systemd-readahead-replay.service.xml')
| -rw-r--r-- | man/systemd-readahead-replay.service.xml | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/man/systemd-readahead-replay.service.xml b/man/systemd-readahead-replay.service.xml deleted file mode 100644 index 669fe78942..0000000000 --- a/man/systemd-readahead-replay.service.xml +++ /dev/null @@ -1,203 +0,0 @@ -<?xml version='1.0'?> <!--*-nxml-*--> -<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" - "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> - -<!-- - This file is part of systemd. - - Copyright 2010 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. ---> - -<refentry id="systemd-readahead-replay.service" conditional='ENABLE_READAHEAD' - xmlns:xi="http://www.w3.org/2001/XInclude"> - - <refentryinfo> - <title>systemd-readahead-replay.service</title> - <productname>systemd</productname> - - <authorgroup> - <author> - <contrib>Developer</contrib> - <firstname>Lennart</firstname> - <surname>Poettering</surname> - <email>lennart@poettering.net</email> - </author> - </authorgroup> - </refentryinfo> - - <refmeta> - <refentrytitle>systemd-readahead-replay.service</refentrytitle> - <manvolnum>8</manvolnum> - </refmeta> - - <refnamediv> - <refname>systemd-readahead-replay.service</refname> - <refname>systemd-readahead-collect.service</refname> - <refname>systemd-readahead-done.service</refname> - <refname>systemd-readahead-done.timer</refname> - <refname>systemd-readahead</refname> - <refpurpose>Disk read ahead logic</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <para><filename>systemd-readahead-replay.service</filename></para> - <para><filename>systemd-readahead-collect.service</filename></para> - <para><filename>systemd-readahead-done.service</filename></para> - <para><filename>systemd-readahead-done.timer</filename></para> - <cmdsynopsis> - <command>/usr/lib/systemd/systemd-readahead/systemd-readahead</command> - <arg choice="opt" rep="repeat">OPTIONS</arg> - <arg choice="plain">COMMAND</arg> - <arg choice="opt">DIRECTORY | FILE</arg> - </cmdsynopsis> - </refsynopsisdiv> - - <refsect1> - <title>Description</title> - - <para><filename>systemd-readahead-collect.service</filename> - is a service that collects disk usage patterns at boot - time. <filename>systemd-readahead-replay.service</filename> - 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 - boot speeds by pre-loading early at boot all data on - disk that is known to be read for the complete boot - process.</para> - - <para><filename>systemd-readahead-done.service</filename> - is executed a short while after boot completed and signals - <filename>systemd-readahead-collect.service</filename> - to end data collection. On this signal, this service - will then sort the collected disk accesses and store - information about them in - <filename>/.readahead</filename>.</para> - - <para>Normally, both - <filename>systemd-readahead-collect.service</filename> - and - <filename>systemd-readahead-replay.service</filename> - 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 - be a good idea to disable - <filename>systemd-readahead-collect.service</filename>.</para> - - <para>On rotating media, when replaying disk accesses - at early boot, - <filename>systemd-readahead-replay.service</filename> - 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, - <filename>systemd-readahead-collect.service</filename> - will also defragment and rearrange files on disk to - optimize subsequent boot times.</para> - </refsect1> - - <refsect1> - <title>Options</title> - - <para><filename>systemd-readahead</filename> understands - the following options:</para> - - <variablelist> - <varlistentry> - <term><option>--files-max=</option></term> - - <listitem><para>Maximum number of - files to read ahead. Only valid - for thes <command>collect</command> - command.</para></listitem> - </varlistentry> - - <varlistentry> - <term><option>--file-size-max=</option></term> - - <listitem><para>Maximum size of files - in bytes to read ahead. Only valid - for the <command>collect</command> - and <command>replay</command> - commands.</para></listitem> - </varlistentry> - - <varlistentry> - <term><option>--timeout=</option></term> - - <listitem><para>Maximum time in microseconds - to spend collecting data. Only valid - for the <command>collect</command> - command.</para></listitem> - </varlistentry> - - <xi:include href="standard-options.xml" xpointer="help" /> - <xi:include href="standard-options.xml" xpointer="version" /> - </variablelist> - - </refsect1> - - <refsect1> - <title>Commands</title> - - <para>The following commands are understood by - <filename>systemd-readahead</filename>:</para> <variablelist> - <varlistentry> - <term><command>collect - [<replaceable>DIRECTORY</replaceable>]</command></term> - <listitem> - <para>Collect read-ahead data on - early boot. When terminating, it will - write out a pack file to the indicated - directory containing the read-ahead - data. </para> - </listitem> - </varlistentry> - - <varlistentry> - <term><command>replay - [<replaceable>DIRECTORY</replaceable>]</command></term> - <listitem> - <para>Perform read-ahead on the - specified directory tree.</para> - </listitem> - </varlistentry> - - <varlistentry> - <term><command>analyze - [<replaceable>FILE</replaceable>]</command></term> - <listitem> - <para>Dumps the content of the - read-ahead pack file to the - terminal. For each file, the - output lists approximately how - much will be read ahead by - the <command>replay</command> - command.</para> - </listitem> - </varlistentry> - - </variablelist> - </refsect1> - - <refsect1> - <title>See Also</title> - <para> - <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> - </para> - </refsect1> - -</refentry> |