[Dockdev] opteron error

Tan Guangming tgm at ncic.ac.cn
Thu Jan 20 05:51:30 PST 2005


Hello!
I compiled dock 5.1.1 on Opteron processor Linux platform, it shows the SEGMENTATION FAULT error message when I run the demo. I traced the program and found that one instruction j=iy/NDIV in the function Random_Number_Generator::independent_rand() gived the error,i.e. iy = 19371779413, NDIV=67108862, however, j = 8156!
Besides, the final results on AMD Opteron is different from that on Intel Xeon! 
Xeon:
 .  ...
	Orientations Passed : 231
 .....
	Energy score: -40.376114
			vdw:  -19.698305
			es:	  -20.677811
Opteron:
.  ...
	Orientations Passed : 233
 .....
	Energy score: -50.252425
			vdw:  -23.808451
			es:	  -21.243562
Why?
	

¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡
 				

¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Tan Guangming
			   National Research Center for Intelligent Computing Systems,
			   Institute of Computing Technology,
			   Chinese Academy of Sciences

			   6#, South Road, Kexueyuan, Zhongguancun,
		       Beijing, P.R.China
		       P.O.Box 2704   Zip Code 100080

               Phone: 86-10-62565533 ext. 5730
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡tgm at ncic.ac.cn
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2005-01-20
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