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Masked Matrix-Matrix Multiplication (Masked SpGEMM)

The repository contains:

  • Masked SpGEMM algorithm implementations: MSA, Hash, Heap, MCA
  • Complemented mask variants: MSA, Hash, Heap
  • Benchmarks: Triangle Counting, K-Truss, Betweenness Centrality

Citation info

The algorithms implemented in this repository are described in the following publication

Srđan Milaković, Oguz Selvitopi, Israt Nisa, Zoran Budimlić, and Aydin Buluç. Parallel algorithms for masked sparse matrix-matrix products. In Proceedings of the 51st International Conference on Parallel Processing, pages 1–11, 2022.

Preprint available at https://arxiv.org/abs/2111.09947

Download repository

This project contains submodule, so use recursive option to download them all.

git clone --recursive https://github.com/PASSIONLab/MaskedSpGEMM.git

Compile code

First compile dependencies:

cd MaskedSpGEMM/
make sprng rmat prmat

Then compile GraphBLAS:

cd GraphBLAS/
cd build
CC=gcc cmake ..
make -j

Compiling MaskedSpGEMM benchmarks:

cmake -B build -S . -DCMAKE_BUILD_TYPE=Release
cmake --build build -- -j

Running the benchmarks:

Algorithms and the number of iterations can be selected using environmental variables:

  • MODE - set to benchmark to execute all algorithms
  • WARMUP_ITERS - number of warmup iterations (not timed)
  • INNER_ITERS - number of timed iterations

Triangle counting

./build/tricnt-all-grb <path-to-mtx-file> <num-threads>

Example: Count the number of triangles for belgium_osm.mtx graph using 12 threads

MODE=benchmark WARMUP_ITERS=3 INNER_ITERS=10 ./build/tricnt-all-grb belgium_osm.mtx 12

K-Truss

./build/ktruss-all-grb <path-to-mtx-file> <k> <num-threads>

Example: Count the number of k-trusses (k == 5) for belgium_osm.mtx graph using 12 threads

MODE=benchmark WARMUP_ITERS=3 INNER_ITERS=10 ./build/ktruss-all-grb belgium_osm.mtx 5 12

Betweenness Centrality

./build/bc-all-grb <path-to-mtx-file> <batch-size> <num-threads>

Example: Calcuate Betweenness Centrality for a batch with 512 vertices for belgium_osm.mtx graph using 12 threads

MODE=benchmark WARMUP_ITERS=3 INNER_ITERS=10 ./build/bc-grb belgium_osm.mtx 5 12