Date: Sat, 15 Oct 2011 16:41:43 +0200 From: Eduardo Morras <nec556@retena.com> To: Dennis Glatting <freebsd@penx.com>,freebsd-questions@freebsd.org Subject: Re: Very large swap Message-ID: <4E5EF2B000C155EA@> (added by postmaster@resmaa13.ono.com) In-Reply-To: <alpine.BSF.2.00.1110132256080.3996@Elmer.dco.penx.com> References: <alpine.BSF.2.00.1110132256080.3996@Elmer.dco.penx.com>
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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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