Accounts:

• For getting an account on Neptune, please contact Dr.Kumar (gmkumar AT ncsu.edu)

Connecting:

• From Windows: Please connect to Neptune using your preferred SSH Client(like Putty or F-Secure or SSH Client) and use the address neptune.ce.ncsu.edu
  
  • Resources: Putty | F-Secure | SSH Client
• From *nix: Please connect to Neptune using the address neptune.ce.ncsu.edu

Compiling Parallel programs

• Compile your programs using mpicc/mpiCC/mpif90.
  Note: You can use mpif77 to compile Fortran 77 programs.
  Eg. For instance, if you wish to compile hello.c/hello.f90/hello.cpp
  • For C, use mpicc -o hello hello.c
    
  • For Fortran, use mpif90 -o hello hello.f90
    
  • For C++, use mpiCC -o hello hello.cpp

Compiling Serial programs

• Compile your programs using pathcc/pathCC/pathf90.
  Note: You can use pathf90 to compile Fortran 77 programs too.
  Eg. For instance, if you wish to compile hello.c/hello.f90/hello.cpp
  • For C, use pathcc -o hello hello.c
    
  • For Fortran, use pathf90 -o hello hello.f90
    
  • For C++, use pathCC -o hello hello.cpp

Running programs

• Using mpirun
  For instance, to run program 'hello' on 4 processors, you specify
  mpirun -n 4 ./hello

• Using mpiexec
  Using mpiexec allows you to control job placement and other advanced options.
  For instance, say you want to run program 'hello' on 4 processors using the two processors on node2 and one processor each on node3 and node4.
  • First you create a file with the machines list(say in a file named 'machines') which contains the following:
    node2:2
    node3
    node4
    

  • Then you specify mpiexec to run the program by specifying
    mpiexec -machinefile machines -n 4 ./hello
• Using qsub
  You need to create a job script specifying the resource requirements and then use qsub to submit the job. Details about usage will be posted soon.