Compile

[] ■ The compiling commands are the same regardless the compiler used．

■ When the environment changes (Cray, Intel, GNU)，the commands actually called by the links are changed．

(The actually called) Command	Intel	GNU	Cray
ftn	ifort	gfortran	crayftn
cc	icc	gcc	craycc
CC	icpc	g++	crayCC

■Only the above compilers are available on the system.．
■When compiling MPI programs, please use: ftn, cc, CC commands．(mpicc, mpif90 are not available)
■Ruby and Perl scripts can't be used．

Compiling example (Cray compiler)：

% cc -O3 -homp -hautothread -o test-hybrid.exe test-hybrid.c

Compiler options example

[]

Cray Compiler：

Option	Meaning
-O[1or2or3]	Optimization level
-hautothread	Auto parallelization
-h[no]omp	OpenMP enabled/disabled
-hvector[1or2or3]	SIMD vectorization level
-hthread[1or2or3]	Thread optimization level
-hscalar[1or2or3]	Scalar optimization level
-hfp[1or2or3]	FP optimization level

Parallelization

OpenMP, MPI and hybrid programming are all supported．

OpenMP

Include the following compile time options．
OpenMP library will be automatically linked．

Cray environment: -h[no]omp
Intel environment: -openmp
GNU environment: -fopenmp

Runtime settings．

Environment variable　 OMP_NUM_THREADS
aprun command option　-d thread_num

Auto Parallelization

　　Both Cray compiler and Intel compiler support automatic parallelization．
　　Please use the following compiler options．

Cray environment: -Oautothread
Intel environment: -parallel

Parallelization

[] OpenMP, MPI and the hybrid code are all supported．

OpenMP

Compile time options．
OpenMP library will be automatically linked during compiling．

Cray environment: -h[no]omp
Intel environment: -openmp
GNU environment: -fopenmp

Runtime options．

Environment variable　 OMP_NUM_THREADS
aprun command option　-d thread_num

Auto parallelization

　　Bot Cray compiler and Intel compiler support auto parallelization．
　　Compile time options．

Cray environment: -Oautothread
Intel environment: -parallel