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Re: Triax profiling on cluster


All nodes ARE using internal memory attached to a node. You are
confusing something here. Each node is an *ordinary* PC. They are
just connected to each other with a mechanism which allows submitting
jobs (sun grid engine). There is nothing special about them.

Maybe Remi was talking about big CPU cache which is always used
automatically. And indeed is relatively big: a whole 6 MB ! Which
confirms what I already said, if you don't use RAM then Intels are
much faster than AMD (this is the case when you are calculating
digits of pi or mandelbrot set, or such). If you do use RAM, then
AMDs are faster. In our calculations we use RAM. A smallest
simulation uses 100MB. Another simulation could be 1 GB. There is no
point with 6 MB of CPU cache then.

Yes, all nodes have this but some of them have bigger cache (reason for the option "big cache") so you don't use RAM at all if possible (but yeah, if its 6MB then it is useless for DEM...).

Who at the university decided to buy Intels with 32 GB... I don't get it.

man, why I am so upset, better forget this.
Hehe don't worry, we are learning each day and hardware is changing each day as well. Also remember that FEM and most numerical tools need BIG RAM, that is probably the reason of the 32GB.



Chareyre Bruno
Maître de Conférences

Grenoble INP
Laboratoire 3SR - bureau E145
BP 53 - 38041, Grenoble cedex 9 - France
Tél : 33 4 56 52 86 21
Fax : 33 4 76 82 70 43

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