[Beowulf] Fortran Array size question

Michael H. Frese Michael.Frese at NumerEx-LLC.com
Tue Nov 3 20:02:02 EST 2009


I think Gus has it right.  Your two arrays are 200 million floating 
point words each, perhaps 8 bytes per word, and therefore are 
approximately about 3  gigabytes total.

That's too big for the default 'small' memory model.

Certainly, there are no limits to array sizes in Fortran.


Mike


At 12:24 PM 11/3/2009, Prentice Bisbal wrote:
>Greg Lindahl wrote:
> > On Tue, Nov 03, 2009 at 01:17:02PM -0500, Prentice Bisbal wrote:
> >
> >> That's exactly the compiler I'm using, and it's failing at ~200 million
> >> elements. I'm  digging through the Intel documentation. Haven't found an
> >> answer yet.
> >
> > Your bug report was incomplete: it really matters if the array is
> > automatic or not, or if it's initialized.
> >
>You're right -  I should have included a code snippet. It's not my code,
>so I don't know if I can share all of it. Here's the line where the
>problem occurs:
>
>dimension vstore(1:4,0:4,5000000,2),fstore(0:4,5000000,2)
>
>If he reduces the 5000000 to a smaller number, it compiles. As shown, he
>gets this error:
>
>ifort adaptnew2.for
>...
>...
>compilation aborted for adaptnew2.for (code 1)
>
>The compiler is Intel's ifort 11.0.074
>
>I'm not a Fortran programmer, so I'm a little out of my element here. If
>it was bash or perl, or even C/C++, that'd be a different story.
>
>--
>Pretnice
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