Problem when running the intel optimized MP LINPACK Benchmark

Hi, I'm running  intel optimized MP LINPACK Benchmark on one node with two Intel Xeon Phi coprocessers. I use "make arch=intel64 verson=offload" to compile the code, and in bin/intel64 I use "./xhpl" to run, and it has no problem. Then I change P,Q from 1,1 to 1,16 because I have 16 cores on the node, and I change N from 1000 to 30000. Then I use "mpirun -np 16 ./xhpl" to run xhpl, but it has an error and stopped, it shows:

"Error in scif_send 104

APPLICATION TERMINATED WITH THE EXIT STRING: Hangup (signal 1)"

What is the reason? Do I run  intel optimized MP LINPACK Benchmark in a wrong way?

Thanks for anyone to solve my question.