On Wed, 20 Apr 2011 06:23:01 -0400, bearophile <[email protected]>
wrote:
Robert Jacques:
I do GP GPU work, so I use floats all the time. They're also useful for
data storage purposes.
Today GPUs are just starting to manage doubles efficiently (Tesla?).
IIRC, the Fermi Tesla cards do doubles at about 1/2 float speed, so
relatively to other GPUs, they are both the most efficient, and have the
best performance. So if there was something that really needed them, I'd
use them. But doubles requires more double the registers and double the
memory bandwidth, both of which make dramatic performance differences
(depending on code). So I'll be sticking to floats and halves for the
foreseeable future.
