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Re: [Question #233320]: compiling with quad precision

 

Question #233320 on Yade changed:
https://answers.launchpad.net/yade/+question/233320

matthias  posted a new comment:
hi guys, 
i tried this proposal of post #40 with some surprising results. i ran 100 replication with 2 threads on an intel and an amd machine.

cpu; data type;min;avg;max;std-dev
Intel(R) Core(TM) i7-3770;double;0,1135;0,3479;0,3706;0,0248
Intel(R) Core(TM) i7-3770;long double;0,3331;0,3555;0,3771;0,0070
AMD FX(tm)-8350 Eight-Core Processor ; double;0,3346;0,3500;0,3613;0,0059

the long double version i compiled only on my intel machine, so there
are no result for th amd machine. the realy surprising thing is, the amd
results are similar to the intel long double ones. so on my machine i
get an increase of accuracy.

i have no explanation, why the results of the amd double experiment are
significant better than the intel double results. so the overall
conclusion is, it's depends on the cpu how good/accurate/noisy are the
results.

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