e4rat is described as '("Ext4 - Reducing Access Times") is a toolset to accelerate the boot process as well as application startups. Through physical file realloction e4rat eliminates both seek times and rotational delays. This leads to a high disk transfer rate' and is an app. There are 2 alternatives to e4rat for Linux. The best e4rat alternative is ureadahead, which is both free and Open Source.
über-readahead is used during boot to read files in advance of when they are needed such that they are already in the page cache, improving boot performance. Its data files are regenerated on the first boot after install, and either monthly thereafter or when packages with...
Sreadahead is a daemon that reads data sequential by use from disk. This is typically used to fetch information needed by the boot process into memory as early as possible. Sreadahead thereby eliminates IO wait times during the boot process which results in a faster startup.
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