parallel code examples for various methods

Several languages C, java, python, several methods

For multi core computers and multi node clusters

Contents

hello world thread_simple.c

thread_simple.c  source file
thread_simple_c.out  output file

compile  gcc -o thread_simple thread_simple.c -lpthreads -lm

java threads for parallel matrix multiply

Links to source file and .out output file, click to read
matmul_thread4.java  source file
matmul_thread4_java.out  output file
matmul_thread1.java  source code
matmul_thread1_java.out  output file

matmul_thread8.java  source file
matmul_thread8_java.out  output file
matmul_thread16.java  source file
matmul_thread16_java.out  output file
matmul_thread32.java  source file
matmul_thread32_java.out  output file
matmul_thread64.java  source file
matmul_thread64_java.out  output file

matmul_thread4_java.slurm  slurm file
matmul_thread4_java.slurm  slurm file
matmul_thread4_java.slurm  slurm file

Compile  javac -cp . matmul_thread4.java
Run      java  -cp . matmul_thread4 > matmul_thread4_java.out # without slurm

pyhreads for parallel matrix multiply

matmul_pthread4.c  source file
matmul_pthread4.out  output file
matmul_pthread8.c  source file
matmul_pthread8.out  output file
matmul_pthread16.c  source file
matmul_pthread16.out  output file

python2, python3, time_thread

time_thread.py  source file
time_thread_py.out  output file
time_thread.py3  source file
time_thread_py3.out  output file

run  python time_thread.py
run  python3 time_thread.py3

OpenMP for parallel Matrix multiply

Only one source file, because OMP_NUM_THREADS controls number of threads
Links to source file and output, shown below
omp_matmul.c  source file
omp_matmul4.out  output file
omp_matmul8.out  output file


# Makefile for omp  OpenMP  just change THREADS=8, 16, 32, 64  
all: omp_matmul4.out 

omp_matmul4.out: omp_matmul.c
	gcc -o omp_matmul omp_matmul.c -fopenmp -lm 
	export OMP_NUM_THREADS=4
	./omp_matmul > omp_matmul4.out

MPI threads for parallel FFT

Links to source file and output, shown below
time_mpi_mp8.c  source file
time_mpi_mp8.slurm  control file
time_mpi_mp8.out  output file

time_mpi_mp16.c  source file
time_mpi_mp16.slurm  control file
time_mpi_mp16.out  output file

Or run with:
mpicc -o time_mpi_mp8 time_mpi_mp8.c -lm
mpirun -np 9 time_mpi_mp8 > time_mpi_mp8.out

mpicc -o time_mpi_mp16 time_mpi_mp16.c -lm
mpirun -np 17 time_mpi_mp16 > time_mpi_mp16.out

roll_call.c  source file
roll_call.out  output file
scat.c  skatter gather source file
scat.out  output file

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Last updated 10/15/2019