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COV880: Parallel Graph Algorithms

Algorithms Implemented

  1. Sequential BFS
  2. Shared Memory BFS
  3. Distributed Memory BFS 1D

I/O Specs

Input Format

Each file in input/ should have the format:

n m r undirected
u_1 v_1 uv_1
...
u_m v_m uv_m

Here
    n               :   Number of unique nodes in the graph
    m               :   Number of edges in the graph

Output format

Each file in output/ has the format:

u  d_u

Usage

Build all the binaries

make

Preprocessing

This will take all files in datasets/ and preprocess each of them. Preprocessed files are stored in input/

make preprocess

To manually preprocess a specific file:

./run.sh preprocess <input_file> <output_file> <undir>

Here, undir = 1 for an undirected graph, 0 otherwise.

Running all Tests

make test_seq
make test_omp T=<num_threads>
make test_mpi P=<num_procs>

This will take all input files in input/ and run the three algorithms on them. By default, OpenMP is run with 8 threads and MPI is run with 4 processes. The output files are generated in output/

Running a specific algorithm on an input

./run.sh seq <input_file> <output_file>
./run.sh omp <input_file> <output_file> <num_threads>
./run.sh mpi <input_file> <output_file> <num_procs>

Validating the outputs

make cmp_omp
make cmp_mpi

These will check if the Parallel versions match with the sequential versions