Re: [patch,libgfortran] PR48298 DTIO implementation for Internal Units

[Toon Moene <toon at moene dot org>]

On 09/15/2016 09:03 PM, Steve Kargl wrote:

[ Thanks - always useful to see real world data ]

> None of these codes use DTIO.  I suspect the codes do very
> little IO, which is perhaps, the majority of Fortran codes.
> My codes and the codes of others that I use in my particular
> corner of research use the basic model
>
> Read input file(s) --> crunch numbers --> write output file(s)
>
> The "crunch numbers" parts swamps IO.

And for those who actually *do* a lot of I/O all file operations will be 
handled by separate MPI processes or OpenMP threads parallel to the 
number crunching (our weather model produces ~ 12 Gbyte of data in an 
hour of computation; now consider 2 dozen instances of those running in 
parallel doing ensemble forecasting).

I agree with Steve (and Jerry, of course): first make it work, than make 
it fast.

Thanks for the work - and kind regards,

--
Toon Moene - e-mail: toon@moene.org - phone: +31 346 214290
Saturnushof 14, 3738 XG  Maartensdijk, The Netherlands
At home: http://moene.org/~toon/; weather: http://moene.org/~hirlam/
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