e4rat has been discontinued. Similar apps include ureadahead, which is free and open source. Other options are Sreadahead. Between them they cover Linux.
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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