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prevent large files from being cached in memory (backups!)

Terminal - prevent large files from being cached in memory (backups!)
nocache <I/O-heavy-command>
2013-05-21 15:15:05
User: michelsberg
21
prevent large files from being cached in memory (backups!)

We all know...

nice -n19

for low CPU priority.

ionice -c3

for low I/O priority.

nocache can be useful in related scenarios, when we operate on very large files just a single time, e.g. a backup job. It advises the kernel that no caching is required for the involved files, so our current file cache is not erased, potentially decreasing performance on other, more typical file I/O, e.g. on a desktop.

http://askubuntu.com/questions/122857

https://github.com/Feh/nocache

http://packages.debian.org/search?keywords=nocache

http://packages.ubuntu.com/search?keywords=nocache

To undo caching of a single file in hindsight, you can do

cachedel <OneSingleFile>

To check the cache status of a file, do

cachestats <OneSingleFile>

Alternatives

There are 6 alternatives - vote for the best!

Terminal - Alternatives

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What others think

Damn, that's useful!

Comment by flatcap 110 weeks and 4 days ago

+1

Comment by wejn 110 weeks and 3 days ago

For those on Ubuntu Precise, I have a backport of nocache in my PPA: https://launchpad.net/~fmarier/+archive/ppa/+index?field.series_filter=precise&batch=75&memo=75&start=75

Comment by fmarier 108 weeks and 1 day ago

Your point of view

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