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       systemd-readahead-replay.service, systemd-readahead-collect.service,
       systemd-readahead-done.service, systemd-readahead-done.timer, systemd-
       readahead - Disk read ahead logic





       /lib/systemd/systemd-readahead/systemd-readahead [OPTIONS...] COMMAND
                                                        [DIRECTORY | FILE]

       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

       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.

       systemd-readahead understands the following options:

           Maximum number of files to read ahead. Only valid for thes collect

           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.

       -h, --help
           Print a short help text and exit.

           Print a short version string and exit.

       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.


systemd 215                                SYSTEMD-READAHEAD-REPLAY.SERVICE(8)

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