[Beowulf] Peformance penalty when using 128-bit reals on AMD64

Greg Lindahl lindahl at pbm.com
Sat Jun 26 17:39:34 PDT 2010

On Sat, Jun 26, 2010 at 03:40:24PM -0700, NiftyOMPI Tom Mitchell wrote:

> In a 30 second scan of GMP's arbitrary precision library I cannot tell
> if 32 and 64bit sizes fall out as equal in performance to native types.

No. It's great for arbitrary large sizes and not so good for 128 bits,
compared to a library that does only 128 bits. It makes no attempt to
do 64 or 32 bit stuff using native types.

-- greg

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