[Beowulf] how to run HPL on a single machine

[M C]

I tried to run HPL on a single  machine, but it always fails

rtes1:/.../hpl/bin/RTES/ mpirun -np 4 xhpl
p0_30424:  p4_error: Path to program is invalid while starting /.../hpl/bin/RTES/xhpl with rsh on rtes1: -1
    p4_error: latest msg from perror: No such file or directory
p0_30235: (45.056821) net_send: could not write to fd=4, errno = 32
p0_30424: (9.047947) net_send: could not write to fd=4, errno = 32
p0_30424: (60.049669) net_send: could not write to fd=4, errno = 32

if I run 
rtes1:/.../hpl/bin/RTES/ mpirun -np 1 xhpl
HPL ERROR from process # 0, on line 419 of function HPL_pdinfo:
>>> Need at least 4 processes for these tests <<<

HPL ERROR from process # 0, on line 621 of function HPL_pdinfo:
>>> Illegal input in file HPL.dat. Exiting ... <<<

I am not sure what is wrong. Actually, what I need is to let Linpack provide some measurable workload in our experiments. So I am not sure whether I need HPL or Linpack 1000 . Who can let me know some docs about MPI and HPL? Thanks.

       
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