Re: Very large swap
- From: Eduardo Morras <nec556@xxxxxxxxxx>
- Date: Sat, 15 Oct 2011 16:41:43 +0200
At 07:08 14/10/2011, Dennis Glatting wrote:
This is kind of stupid question but at a minimum I thought it would be interesting to know.
What is the limitations in terms of swap devices under RELENG_8 (or 9)?
A single swap dev appears to be limited to 32GB (there are truncation messages on boot). I am looking at a possible need of 2-20TB (probably more) with as much main memory that is affordable.
I used 40 GB swap in 8.2. I wanted to test if caching files/data on memory swap were faster than an ordinary, always the same, standard approach of read/write from/to disk when need. It was faster, not a lot faster but mesurable. Of course when app exits files/data is lost.
I am working with large data sets and there are various ways of solving the problem sets but simply letting the processors swap as they work through a given problem is a possible technique.
Processors, memory, storage, and other hardware are open issues but for the minute I'm doing things on the cheap, which, admittedly, has a certain intellectual amusement factor.
TIA
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