mpi+openmp程序需要注意事项

编译的选项

Intel

• Fortran : ifort,

• Fortran with MPI: mpif77, mpif90

• C/C++ :icc

• C/C++ with MPI: mpcc, mpCC

• Option to support OpenMP

• -openmp

Portland Group

• Fortran : pgf77, pgf90

• Fortran with MPI: mpif77, mpif90

• C/C++ :pgcc

• C/C++ with MPI: mpcc, mpCC

• Option to support OpenMP

• -mp

• pgifortref.pdf has good examples

1 openmp程序编译

(1)编译选项选择

Compiling to use OpenMP

OpenMP is supported in all four programming environments available on Franklin and Hopper; however, each compiler suite has a different syntax for enabling OpenMP.

Compiler Suite	Programming Environment module name	Command line option for OpenMP
Portland Group	PrgEnv-pgi	-mp
Pathscale	PrgEnv-pathscale	-mp
Cray Compilers	PrgEnv-cray	none needed
Intel Compilers (Hopper only)	PrgEnv-intel	-openmp
GNU Compilers	PrgEnv-gnu	-fopenmp

gcc –fopenmp helloworld.c

运行时 export OMP_NUM_THREADS=4设定线程数

2mpi程序编译

mpirun -np 16 ./program

3 mpi+openmp混合编译

参考网址：http://www.nersc.gov/users/computational-systems/hopper/running-jobs/using-openmp-with-mpi/

http://geco.mines.edu/workshop/aug2010/slides/thu/hybrid.pdf

（1）fortran版本

编译：

mpif90 -o earthmo earthmo.f90 -openmp

使用哪个？

对于intel的mpirun，必须在mpirun后加上-env I_MPI_PIN_DOMAIN omp使得每个mpi进程会启动openmp线程。

通过export OMP_NUM_THREADS来控制每个MPI产生多少线程。

（2）c/ c++版本

gcc –fopenmp helloworld.c