Re: [gfortran] Patch for potential bug in i/o library

[bud davis <bdavis9659 at comcast dot net>]

Thomas Koenig wrote:

> Janne Blomqvist wrote:
>
>  
>
> > I guess the key to improving i/o performance would
> > be to make the library interface more coarse grained, e.g. enabling
> > transfer of contigous array sections in one go instead of looping over
> > all the individual elements?
> >    
>
> Definitely.  For arrays, it would be straightforward to pass an
> array descriptor to the i/o library, and have it handled there.
> Lots of m4 to be written :-)  Implied do loops will be harder,
> but not as important.  If these can be converted to an
> array descriptor (sort of, using temporaries), that would be ideal.
>
>  
if someone grabs this idea and implement it, please also keep in mind 
the need to know how many bytes will go into an unformatted sequential 
record before it is written....

the seeking back into the file to write the start marker will always be 
a big performance loss (esp for NFS mounted files).


--bud