[Carpet] Error in gpu timing information

[Erik Schnetter]

As Peter Diener pointed out to me, Carpet contained an error in its  
calculations of the "grid point updates per second" numbers.  Instead  
of ignoring the ghost zones, they were counted twice, leading to  
inflated timing numbers.  I have corrected this error in the both the  
stable and the development versions of Carpet.  Do not be alarmed  
when you see the gpu values decrease sharply.

Incidentally, this brings the gpu numbers of mesh refinement  
simulations (with their many ghost zones) and multi-patch simulations  
much closer together.

The "physical time per hour" values are not affected.

When you interpret the gpu numbers, note that these are different for  
each processor.  They are not a property of the simulation.  If you  
want to compare two different simulations, then you have to sum up  
all gpu numbers.  Alternatively, you can use the "physical time per  
hour" values.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

My email is as private as my paper mail.  I therefore support encrypting
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