[MITgcm-support] problems on alpha machine

[Hezi Gildor]

Dear Ed and Martin,

Thanks for trying to help.

I have tried all the -fpeX options as well as reducing the optimization 
level but it didn't help.

 It seems that phlocal=-Infinity at certain location after 2 iteration 
and then the code try to execute 10**(-Infinity). Still didn't find when 
and why phlocal gets this value.


as for the other problem, in diagnostics_main_init.F :

i tried to define a separate character variable and assign 
rUnit2c//'^2/s^2' to it but it didn't help. same when trying ' m' 
instead of 'm '

Thanks again..., hezi.



Ed Hill wrote:

>On Sun, 2005-12-04 at 12:03 +0100, Martin Losch wrote:
>  
>
>>Hezi,
>>
>>has someone answered you, yet?
>>
>>The first problem looks like perfect F77 syntax to me, so I have no 
>>clue why your compiler doesn't take it. Can it compile rUnit2c//'^2'? 
>>Maybe one has to define a separate character variable, assign 
>>rUnit2c//'^2/s^2' to it and then pass it to diags_mk_units? This is 
>>really stupid but have you tried to set rUnit2c = ' m' instead of 'm '?
>>    
>>
>
>Hi Hezi,
>
>I think Martin is right and that it is valid syntax.  I'm sorry your
>compiler doesn't like it.  Perhaps there is a compiler option that will
>help? 
>
>
>  
>
>>Maybe you can try reducing your optimization level. Again I don't know 
>>your compiler, but -O5 sounds like aggressive optimization.
>>    
>>
>
>Some compilers for the alpha architecture have options that will allow
>you to turn off some or all floating-point exceptions (or make them only
>issue warnings instead of stopping your program).  The options are
>usually called "-fpeX" where X is a number in the range 0--4.  So please
>take a look at your compiler documentation and see if there are any
>options that can help.
>
>Ed
>
>ps - As a last resort, one can extend the recently-added signal 
>     handler code (MITgcm/eesupp/src/sigreg.c) to trap and ignore 
>     any signals caused by floating point exceptions.  [This is
>     what the "-fpe" options do.]
>
>  
>