Add multithreaded matmul-c implementation #40
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Adds a CPU-parallel matrix multiplication implementation using a threadpool. Parallelism is intra-matrix (i.e. different parts of a single matrix-multiply operation are performed on different threads) so that threading is transparent to the caller.
Refeactos the codebase to split the tests and benchmarks into separate files. Adds some large matrix multiplication benchmarks for the serial and parallel implementations.
Updates the matmul-c square matrix scaling tests to align with mhauru's Julia tests. The benchmarks now perform 19 test with increasingly large square matrices. Single-threaded and multi-threaded matrix multiplication tests are both performed. The results are stored in the same results.csv file so that everything can be plotted together.
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Adds a CPU-parallel matrix multiplication implementation using a threadpool. Parallelism is intra-matrix (i.e. different parts of a single matrix-multiply operation are performed on different threads) so that threading is transparent to the caller.