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How to clear the / inode directory cache on MacOSX

How to clear the file system cache (e.g. directory cache and inode cache) on Mac OSX? I would like to conduct a performance analysis on a cold MacOSX machine. I am wondering if there is any approach like echo 3 > /proc/sys/vm/drop_cachesin a Linux container?

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is there purge(8)any use for you?

Purge can be used to approximate initial boot conditions by using a cold disk buffer cache for performance analysis. This does not affect anonymous memory that has been allocated via malloc, vm_allocate, etc.

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I think there are two good programs for this. Try OnyX or Yasu.

http://www.macupdate.com/app/mac/11582/onyx

http://jimmitchell.org/yasu/

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