Search found 2 matches

by levineds
Fri Feb 28, 2020 11:39 pm
Forum: User discussion
Topic: Very large sparse eigensolves
Replies: 2
Views: 1135

Re: Very large sparse eigensolves

I haven't used anything like that so far. I've had the most success so far with Eigen/Spectra, but we are running into real bottlenecks due to its serial implementation. Also I lost an order of magnitude on the sparsity, it's <0.0005%. Why do you need to square the matrix, why can't you just level-s...
by levineds
Sat Feb 22, 2020 4:17 am
Forum: User discussion
Topic: Very large sparse eigensolves
Replies: 2
Views: 1135

Very large sparse eigensolves

The problem I am working on requires solving for the smallest (algebraic) eigenvalues (they are negative numbers) and eigenvectors of very large symmetric, sparse matrices (larger than 5 million x 5 million, sparsity <0.005%). I have been shopping around a variety of packages looking for one that ca...