tutorial - Speed Up Applications Load Time in Ubuntu - Preload

Preload is considered to be read-ahead daemon application as it analyzes the applications which user runs, and on the basis of this analysis it predicts which applications user can run next time and launches these applications in RAM. Its daemon keeps running in background all the time and saves the required information about the applications you are running so that it may load them quickly next time.

Open the terminal and run the following command to install preload: sudo apt-get install preload

Now to start preload run the following command in terminal:
sudo /etc/init.d/preload start

It will be installed instantly. Now it will run in the background and will keep track of the applciations you run.  To stop it simple run following command in terminal.
sudo /etc/init.d/preload stop

The configuration file for Preload is kept in /etc/preload.conf and the default values should be fine for most people. But if you want to tweak the operation of Preload, an explanation of the options is available in the configuration file.

you can monitor Preload logfile by running:sudo tail -f /var/log/preload.log


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source:http://linuxpoison.blogspot.com/2009/08/13578175711874.html