Dear all;

I have written a code in Fortran90, but this code is run for large
systems very slowly (because of large amount of data)
now I want to convert my program to a parallel one. but I haven't ever
written parallel program.
Would you please guide me what should I do?

I'm anxiously looking forward your reply and guidelines.

Kind regards,
Fatemeh

On 3 sep, 12:34, Fatemeh gmail.com> wrote:

There are roughly speaking three methods you can use:
- OpenMP - the easiest method, as it involves compiler directives
mostly
- multithreading (tricky to get right, but more flexible than
OpenMP)
- multiprocessing (MPI is a commonly used method)

On Wed, 3 Sep 2008 03:34:59 -0700 (PDT), Fatemeh gmail.com>
wrote in l42g2000hsc.googlegroups.com>:

What is your compiler, and what is your target system? Intel
Fortran, for example, can parallelise sections of code for execution on
multi-core processors. For example, a dataset comparison I wrote (on
Linux) executed in 9 hours, but reported 13-1/4 hours CPU time on a 2.2
GHz dual-core Athlon. It ran much faster than that on a quad-core 2.4 GHz
Core 2 processor, but I think much of that was due to being able to use
SSE3 instructions (and maybe SSSE3). The compile flags I used were

ifort -O3 -parallel -ipo0

On Sep 3, 3:54 am, Arjen Markus wrote:

On Wed, 3 Sep 2008, Fatemeh wrote:

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|"I have written a code in Fortran90, [..] |
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Dear Fatemeh,

When did you write this Fortran90 code?

With best regards,
Colin Paul

On Sep 5, 2:47 pm, Colin Paul Gloster ACM.org>
wrote:

It's new. I have just written it. (can I see your code?)

Fatemeh wrote:

Google is your friend.

On Fri, 5 Sep 2008, Fatemeh wrote:

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|"On Sep 5, 2:47 pm, Colin Paul Gloster ACM.org> |
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