Why the unilization ratio of CPU is more than 100% in the running process of nwchem?

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2:39:08 AM PDT - Mon, May 19th 2014
Hi, I am a new user of nwchem. I had compiled nwchem6.3 by using of intel compiler and mkl math library?composer_xe_2013_sp1.2.144?and openmpi-1.6.5? Butin the running process of nwchem, the unilization ratio of CPU is more than 100% (Some is up to 300%, resulting in the node nearly collapse? Why? Please help me! Thank you!