不知何故mpirun未能承认我的$PATH. PyroDist我所拥有的程序$PATH有效：
$ PyroDist
Can't find asked option -in
PyroDist - pairwise distance matrix from flowgrams
-in string flow file name
-out stub out file stub
Options:
-ni no index in dat file
-rin string lookup file name
并使用mpirun完整路径运行它也可以：
$ mpirun -np 4 ../bin/PyroDist -in C005.dat -out foo
0: Read data
0: Broadcast data
0: Broadcast flows
nN=2094 nM=360 nSize=753840
但这失败了：
$ mpirun -np 4 PyroDist
Missing: program name
Program PyroDist …