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[x3n0m0rph59]

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[X3n0m0rph59]

Does precached generate a list of the most important files?

Yes, but there is room for improvement. Precached currently stores the count of executions of programs (represented by a histogram).

You may view this histogram with:

$ sudo precachedctl plugins hot-applications list

When precached performs offline-prefetching (ahead of time), it will replay the trace logs of the most important programs in the order of its execution count.

Lets say 10 often used programs use file a 9 times, file b 7 times, file c is only used by 2, file d is only used with/after file c....?

What you describe resembles a so called Markov-chain. It is planned to implement such a Markov-chain based algorithm in the near future.

[idnovic]

Thank you for your time. I find precached very useful and interesting :)

[idnovic]

Cool also I found the optimize option.
Do I need to optimize regularly or is the optimization automated?

[X3n0m0rph59]

Optimization of trace logs is handled by precached automatically (during system idle time).
Manual optimization may be triggered (online) by issuing this command:

$ sudo precachedctl housekeeping

If online optimization is not desired, one can use:

$ sudo iotracectl optimize

The histogram does not take up much space, so the decision was made, to only optimize on user request!