[Beowulf] Fortran Array size question
Michael H. Frese
Michael.Frese at NumerEx-LLC.com
Tue Nov 3 17:02:02 PST 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.
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
>If he reduces the 5000000 to a smaller number, it compiles. As shown, he
>gets this error:
>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.
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