[MITgcm-devel] linux_ia64_ifort+mpi_altix_gfdl

[Baylor Fox-Kemper]

Hi Dimitris,
   I did a little testing on a medium sized simulation (64  
processors) with -ip and -ipo.  I saw modest improvements in speed  
(couple of percent) with -ip and no further increase with -ipo.  Of  
course, -ipo takes more than twice as long to compile.  But, I think  
there is no other loss in using -ipo if you like...
    -Baylor

On Dec 6, 2006, at 5:17 AM, Dimitris Menemenlis wrote:

> Constantine, is "-ipo" the default?  And will "-ip" speed up  
> execution of code relative to default or is it just meant to speed  
> up linking of the code?  Dimitris
>
>> Inline (within the scope of the file as opposed to -ipo which uses  
>> a global scope but takes longer to compile as it recompiles  
>> everything at link time).
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