[Beowulf] Q: AMD Opteron (Barcelona) 2356 vs Intel Xeon 5460

Greg Lindahl lindahl at pbm.com
Wed Sep 17 16:25:43 EDT 2008


On Wed, Sep 17, 2008 at 03:43:36PM -0400, Eric Thibodeau wrote:

> Also, note that I've had issues with icc  
> generating really fast but inaccurate code (fp model is not IEEE *by  
> default*, I am sure _everyone_ knows this and I am stating the obvious  
> here).

All modern, high-performance compilers default that way. It's certainly
the case that sometimes it goes more horribly wrong than necessary, but
I wouldn't ding icc for this default. Compare results with IEEE mode.

-- greg


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