MATLAB: Parallel Matrix Multiplication

matrix multiplicationparallel

I am looking for a short tutorial/example explaining how we do matrix multiplication in parallel. Note that, the size of matrix is currently 200 * 200 (40000 elements). Thanks.

Best Answer

The best way to do matrix multiply in MATLAB is to use the * operator, as you normally would. This will call highly optimized BLAS routines that have parallel algorithms in the background as appropriate. If you have sparse matrices, the * operator will call specialized sparse matrix multiply routines. You will be very hard pressed to do better on your own.

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MATLAB: Is SUM not multithreaded on a dual core machine in MATLAB 7.8 (R2009a)

SUM is memory bound. The issue directly relates to throughput on the CPU(s). The following results illustrate this:

1. Two cores share one BUS

>> x = rand(1000);
>> tic; mean(mean(x)); toc
Elapsed time is 0.002357 seconds.

2. Two cores with two BUSES

>> x = rand(1000);
>> tic; mean(mean(x)); toc
Elapsed time is 0.001802 seconds.

3. Using ‘-singleCompThread’:

>> x = rand(1000);
>> tic; mean(mean(x)); toc
Elapsed time is 0.002660 seconds.

MATLAB: What is the fastest way to compute the first eigenvector

Read about eigs

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MATLAB: Is SUM not multithreaded on a dual core machine in MATLAB 7.8 (R2009a)

MATLAB: What is the fastest way to compute the first eigenvector

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