[ODE] ODE slow on itanium?

Bram Stolk bram at sara.nl
Mon Dec 4 11:57:19 MST 2006

On Sun, 2006-12-03 at 21:46 +0000, Bill Sellers wrote:
> Hi All,
> I've just been doing some benchmarking of my simulation on various  
> processors and they all behave about as I expect except for a truly  
> dreadful showing on a recent 1.6GHz Itanium system. It's over 3 times  
> slower than an Opteron 252 which is hardly cutting edge anymore, and  
> over twice as slow as the Xeon 5160 in my MacPro. They are all  
> compiled with gcc using the standard "-O3 -ffastmath" options. Anyone  
> got any idea what's wrong since I don't think the Itanium should be  
> this slow...

You may want to see if single/double precision makes any difference.
Maybe itanium has faster doubles than floats due to mem aligning?
(wild guess)


> Cheers
> Bill
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