https://community.intel.com/t5/Intel-MPI-Library/scalapack-example-with-MPI/m-p/875292#M1848 Not to worry - I solved the problem - installed openmpi from source, I guess the vendor mpich that I had wasn't compatible.<BR /> Fri, 13 Jun 2008 11:42:43 GMT Basden__Alastair 2008-06-13T11:42:43Z https://community.intel.com/t5/Intel-MPI-Library/scalapack-example-with-MPI/m-p/875291#M1847 Hi,<BR />I'm trying to compile the scalapack example1.f using the MKL. However, when I run this code using:<BR />mpirun -np 6 ./examplemkl<BR />it doesn't seem to pick up the number of processors, and so gives:<BR />BLACS ERROR 'Illegal grid (2 x 3), #procs=1'<BR />and then aborts.<BR /><BR />My compiler line is:<BR />mpif77 example1.f -o examplemkl -L/opt/intel/mkl/10.0.1.014/lib/em64t -lmkl_scalapack_lp64 -lmkl_blacs_lp64 -lmkl_lapack -lmkl_intel_lp64 -lmkl_intel_thread -lmkl_core -lguide -lpthread<BR /><BR />Any help would be appreciated...<BR />Alternatively, does anyone have other example code that I can try?<BR /><BR />I'm using mpich.<BR />Thanks...<BR /> Wed, 11 Jun 2008 12:10:59 GMT https://community.intel.com/t5/Intel-MPI-Library/scalapack-example-with-MPI/m-p/875291#M1847 Basden__Alastair 2008-06-11T12:10:59Z https://community.intel.com/t5/Intel-MPI-Library/scalapack-example-with-MPI/m-p/875292#M1848 Not to worry - I solved the problem - installed openmpi from source, I guess the vendor mpich that I had wasn't compatible.<BR /> Fri, 13 Jun 2008 11:42:43 GMT https://community.intel.com/t5/Intel-MPI-Library/scalapack-example-with-MPI/m-p/875292#M1848 Basden__Alastair 2008-06-13T11:42:43Z