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Following this question

I can reproduce that the first time I execute a du of a directory it takes longer than if I do it just after.

Where is this caching happening? How can I clean it? I would like to perform some performance tests about the time a directory is taking on giving its size by executing time du -sh /home/user/directory

Jeff Schaller
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Zumo de Vidrio
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    Relative answer to your question you could find at:

    https://unix.stackexchange.com/questions/8485/how-to-cache-or-otherwise-speed-up-du-summaries

    Found that there is option to drop Filesystem cache at: proc/sys/vm/drop_caches

     – Miloš Stojanović Jun 30 '20 at 13:55

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