From d6bc8348d5be8576a475ac8ced2b0146e60fb71f Mon Sep 17 00:00:00 2001 From: Daniel Buch Date: Tue, 26 Aug 2014 21:17:22 +0200 Subject: readahead: wipe out readahead --- man/systemd-readahead-replay.service.xml | 203 ------------------------------- 1 file changed, 203 deletions(-) delete mode 100644 man/systemd-readahead-replay.service.xml (limited to 'man/systemd-readahead-replay.service.xml') 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 @@ - - - - - - - - - systemd-readahead-replay.service - systemd - - - - Developer - Lennart - Poettering - lennart@poettering.net - - - - - - systemd-readahead-replay.service - 8 - - - - systemd-readahead-replay.service - systemd-readahead-collect.service - systemd-readahead-done.service - systemd-readahead-done.timer - systemd-readahead - Disk read ahead logic - - - - systemd-readahead-replay.service - systemd-readahead-collect.service - systemd-readahead-done.service - systemd-readahead-done.timer - - /usr/lib/systemd/systemd-readahead/systemd-readahead - OPTIONS - COMMAND - DIRECTORY | FILE - - - - - Description - - systemd-readahead-collect.service - is a service that collects disk usage patterns at boot - time. systemd-readahead-replay.service - 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. - - systemd-readahead-done.service - is executed a short while after boot completed and signals - systemd-readahead-collect.service - to end data collection. On this signal, this service - will then sort the collected disk accesses and store - information about them in - /.readahead. - - Normally, both - systemd-readahead-collect.service - and - systemd-readahead-replay.service - 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 - systemd-readahead-collect.service. - - On rotating media, when replaying disk accesses - at early boot, - systemd-readahead-replay.service - 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, - systemd-readahead-collect.service - will also defragment and rearrange files on disk to - optimize subsequent boot times. - - - - Options - - systemd-readahead understands - the following options: - - - - - - Maximum number of - files to read ahead. Only valid - for thes collect - command. - - - - - - Maximum size of files - in bytes to read ahead. Only valid - for the collect - and replay - commands. - - - - - - Maximum time in microseconds - to spend collecting data. Only valid - for the collect - command. - - - - - - - - - - Commands - - The following commands are understood by - systemd-readahead: - - collect - [DIRECTORY] - - 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. - - - - - replay - [DIRECTORY] - - Perform read-ahead on the - specified directory tree. - - - - - analyze - [FILE] - - 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 replay - command. - - - - - - - - See Also - - systemd1 - - - - -- cgit v1.2.3-54-g00ecf