PETSc in double-double and quad-double...

[Jed Brown]

Todd Munson wrote:
> 
> If we can do qd_real, we could also try using the arprec package and get
> arbitrary precision math.  I might be interested in that as well...

That will not work and really can't be made to work because each term
takes a different amount of space.  The implementation holds a double*
so memcpy only gives a shallow copy and the pointer is worthless after
it's sent to a different process.  It would be a lot of work to pack and
unpack every value (and change the size of the buffers dynamically).

Jed

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