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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