Search found 3 matches

by generalzod
Wed Mar 11, 2020 3:48 pm
Forum: User discussion
Topic: Limitations on precision
Replies: 5
Views: 861

Re: Limitations on precision

Some of these errors seem to be large and inconsistent. This is what I get on one of our systems with V100 and Intel CPU. [tomov@a04 testing]$ ./testing_dsyevd -JV --niter 5 -c -l -n 7000 % MAGMA 2.5.2 svn compiled for CUDA capability >= 7.0, 32-bit magma_int_t, 64-bit pointer. % CUDA runtime 9020,...
by generalzod
Wed Mar 11, 2020 2:25 am
Forum: User discussion
Topic: Limitations on precision
Replies: 5
Views: 861

Re: Limitations on precision

Are you using MAGMA's testers to test these, e.g., testing/testing_zheevd? Which specific routine are you using? If using MAGMA's tester, can you share the complete input & output that is concerning you? We generally check the relative backwards error, || A - U S U^H ||_1 / ( || A ||_1 N ) MAGMA's ...
by generalzod
Mon Mar 02, 2020 1:28 am
Forum: User discussion
Topic: Limitations on precision
Replies: 5
Views: 861

Limitations on precision

Hello

I want to get eigenvalue/eigenvectors for very large and dense matrix (n=100k)
It seems like errors are accumulate more as matrix gets larger (|A-USU^H|)
Is this inherent limitation of double precision arithmetic or can it be mitigated somehow with other iterative method?

Thank you