question about Petsc_Real

[tsjb00]

Thanks for the reply! 
----------------------------------------
> Date: Wed, 11 Jun 2008 16:08:17 -0500
> From: balay at mcs.anl.gov
> To: petsc-users at mcs.anl.gov
> Subject: Re: question about Petsc_Real
> 
> On Wed, 11 Jun 2008, tsjb00 wrote:
> 
>> 
>> Have a stupid question about the precision of Petsc_Real (float, double, long double...)
> 
> 
>> Is it defined when installing the PETSC package? How? 
> 
> yes with the configure option --with-precision=double. However -
> precisions other than double are not well tested.
> 
>> Once the PETSC is installed, can I still change the precision of
>> Petsc_Real for different application code? How?
> 
> nope.
> 
>> Do I have to recompile the PETSC package?
> 
> yes you have to recompile.  However you can use a different PETSC_ARCH
> for this build - so that both builds are useable. [you can switch
> between them by using the correct PETSC_ARCH value with make - when
> compiling your code]
> 
> Satish
> 

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