Re: [Beowulf] array shape difference

2009-11-10 Thread Larry Stewart
On Tue, Nov 10, 2009 at 8:30 PM, amjad ali wrote: > HI, > > suppose we have four arrays with same number of elements say 6., but > different dimensions like: > > array1(1:6) > array2(1:2, 1:3) > array3(1:2, 1:300, 1:100) > array4(1:4, 1:15, 1:10, 1:100) > > > Does each of these array

[Beowulf] array shape difference

2009-11-10 Thread amjad ali
HI, suppose we have four arrays with same number of elements say 6., but different dimensions like: array1(1:6) array2(1:2, 1:3) array3(1:2, 1:300, 1:100) array4(1:4, 1:15, 1:10, 1:100) Does each of these arrays in fortran will occupy same amount of memory? For sending/receiving e

[Beowulf] Configuring HPCC

2009-11-10 Thread SpiduS Okami
Hello To All! This is my first post in beowulf list. I am looking for a help to configure my HPC Challenge test. I will be graduating in Computer science soon and,before that, I need to deliver a graduation work. I choosed to compare a "supercomputer" with a cluster of old machines, trying to proo

Re: [Beowulf] bizarre scaling behavior on a Nehalem

2009-11-10 Thread Tiago Marques
Hi all, Sorry to ressurect this thread after all this time but I just figured out the problem with VASP by chance. VASP's INCAR file accepts one parameter that both fixes scalability problems and increases performance at the same time, even if you still stick to 6 cores. That parameter is NPAR. I

[Beowulf] MPI Coding help needed

2009-11-10 Thread amjad ali
Hi all. (sorry for duplication, if it is) I have to parallelize a CFD code using domain/grid/mesh partitioning among the processes. Before running, we do not know, (i) How many processes we will use ( np is unknown) (ii) A process will have how many neighbouring processes (my_nbrs = ?) (iii) How