[Wien] machines file ... again

[Jorissen Kevin]

Van: wien-admin at zeus.theochem.tuwien.ac.at namens Griselda Garcia
Verzonden: wo 6-10-2004 0:05
Aan: wien at zeus.theochem.tuwien.ac.at
Onderwerp: Re: [Wien] machines file ... again



Hello! Kevin

Yes, I remember that discussion however I considered that was important when
you try to use the two processors of the same machine but in my case I am
trying to use one processor of diferent dual machines.


Well, I'm not a MPI specialist (I'm not even using it myself), so let's hope someone else confirms or contradicts what I said.  Maybe you're right about the memory requirements, but what about the speed of communication between the two processors?  If it's just Gbit - too slow, I fear.


But, if what you cited it is true, It is convenient to use th K-point
parallelization in any way.
So, I have other question, when the system to study have several atoms and
one K-point, how do you run the code in parallel?, the running time will be
similars in serial and K-point-parallel version?

If there is only one k-point, then the k-parallel version has exactly the same speed as the serial version, since it will use only one processor.  So it is of little use (except for redirecting lapw1 and lapw2 to another machine than the one on which you launched the run_lapw).

 



Thanks!!

Griselda.



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Kevin Jorissen
 
EMAT - Electron Microscopy for Materials Science   (http://webhost.ua.ac.be/emat/)
Dept. of Physics
 
UA - Universiteit Antwerpen
Groenenborgerlaan 171
B-2020 Antwerpen
Belgium
 
tel  +32 3 2653249
fax + 32 3 2653257
e-mail kevin.jorissen at ua.ac.be
 

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