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Feh / nocache

minimize caching effects
BSD 2-Clause "Simplified" License
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Support O_DIRECT? #31

Closed poige closed 8 years ago

poige commented 8 years ago

My observations show that method's being currently used possibly may fail to prevent cache pollution.

May be it's related to https://www.percona.com/blog/2010/04/02/fadvise-may-be-not-what-you-expect/

I suppose using O_DIRECT could be more promising way to achieve the goal.

Feh commented 8 years ago

Can you be more specific? Yes, this nocache is more of a dirty hack that after the fact evicts pages from the page cache. Not exactly preventing cache pollution, more a way to avoid cache trashing by certain classes of applications.

If you want a foolproof solution, use a cgroup and limit its memory footprint; see the README here: https://github.com/Feh/nocache#alternate-approaches

Closing this issue; please reopen if you have a reproducible problem or a concrete idea of how to improve the current code.