I have an HP laptop computer with dual core CPU's and 6 GB of RAM, running the MS Vista 64-bit operating system and the Intel 64-bit FORTRAN compiler, version 10.0.027. I am trying to follow the MPI FORTRAN example codes in the book, "Using MPI: Portable Parallel Programming with the Message-Passing Interface," 2nd ed., by W. Gropp, et. al. Specifically, I am trying to run the simple FORTRAN program shown on page 25 which calculates pi, CalcPi. I have successfully, I think, loaded, compiled, and linked this short FORTRAN program with the MPI library--no errors. When I run it, just by initiating the CalcPi.exe, as in C:> CalcPi the program runs and produces the correct pi result; however, the variable "numprocs," which is the number of processes used to do the calculation, is always 1, no matter how many integration steps I request. Doing more research, I found that I was not properly starting this MPI code: I should be initiating the command: C:> mpiexec -n 4 CalcPi.exe if I wanted more than 1 process (4 in this case). However, when I run this, I get this error message:
Error while connecting to host. No connection could be made because the target machine actively refused it. (10061) Connect on sock (host=Owner-PC, port=8676) failed, exhaused [sic] all end points Unable to connect to 'Owner-PC:8676', sock error: Error = -1
I am the administrator on this laptop, and I am not trying to connect to another machine, to my knowledge. So, what am I doing wrong? As I say, when I run CalcPi.exe as C:> CalcPi all appears to run well, except that "numprocs" always equals 1 no matter how many integrations steps I request, and I have gone as high as 1 billion.
New MPI user question.
