e4rat-preload(8)

E4RAT-PRELOAD(8)

User Manuals

E4RAT-PRELOAD(8)

NAME

e4rat-prealod - Preload files into memory

SYNOPSIS

e4rat-preload [ option(s) ] file(s)

DESCRIPTION

e4rat-preload transfers files into memory to gain a high cache hit rate. The list file(s) must be in a format generated by e4rat-collect. It assumes that all files got reallocated by e4rat-realloc at first.

In order to prevent disk seeks the preloading process is divided into two steps. First, it reads the files' I-Node information. In the second step, it reads the files' content. This can be done in parallel of executing the command specified with --execute. If e4rat-preload is executed as the init process by adding it to the kernel parameters, /sbin/init is called.

OPTIONS

-V --version: show version information and exit.
-h --help: display usage message and exit.
-v --verbose: increment verbosity level.
-q --quiet: set verbosity level to 0. This means that no messages will be displayed.
-l --loglevel <number>: set loglevel to <number>. All log messages are either send to Kernel log (see dmesg(1)) or syslog(3).
-x --execute <command>: As soon as I-Node preloading is done, execute <command>. Reading file content into the page cache in parallel.
-s --sort: sort files by their physically position. Inserts the device id and I-Node number if they're missing.
-o --output [file]: write sorted file list to output file. If filename is not supplied, it is written to the stdout.

EXAMPLES

Accelerate program startup time of Mozilla Firefox:

e4rat-preload /var/lib/e4rat/firefox -x firefox

Accelerate the boot process:

Run e4rat-preload as early as possible. It is recommended to run it as the init process. To do so, append the following line to the Kernel parameters in grub(8) or lilo(8):
init=/sbin/e4rat-preload

FILES

/etc/e4rat.conf
E4rat configuration file.

AUTHOR

Written by Andreas Rid and Gundolf Kiefer.

REPORTING BUGS

Report bugs to Andreas Rid <conso at users.sf.net>.