Linux and swap

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mik_os2012-03-30 22:13:35

linux

mik_os, 2012-03-30 22:13:35

Linux and swap

There is a working machine with 8GB of RAM, Ubuntu.
There is a situation: 2GB is free (of which about 1.8GB is cached), a new program is launched that wants to eat 1GB.

The question that has been tormenting me for a long time: why, instead of dropping the cache, the system starts swapping, and even so hard that the mouse cursor sometimes freezes?

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4 answer(s)

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ragus, 2012-03-30
@ragus

vm.vfs_cache_pressure
vm.swappiness
to the rescue. customize as you like.

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shadowalone, 2012-03-30
@shadowalone

These are the problems of the program, for anyone ... further look at the system, it should give up the use of the cache.

Z

Zloy1, 2012-03-31
@Zloy1

Try setting swappiness to 0 echo 0 > /proc/sys/vm/swappiness
I read somewhere that this forces the axis to freeload completely and use all caches before swapping anything. Do you write it? Do you need it?

A

AnViar, 2012-04-02
@AnViar

Is this program a database instance by any chance?