SVD memory spike

tinastone — Fri, 22 Jun 2012 17:22:10 GMT

Hi there,

I am using MKL for it SVD functionality in a C++ program. I notice a huge memory spike towards the end of computing the SVD. This is sometimes causing crashes, slowdowns, etc, when swapping occurs.

my code call is the following:
info = LAPACKE_sgesvd(LAPACK_ROW_MAJOR, 'S', 'S', m, n, src, n, s, u, m, vt, n, superb);

My computer is a Dell Precision T7500 with 2 Xeon E5645 CPUs. Hyperthreading is enabled. I have 12 GB system RAM.

My testing dataset is 150x190x1340 (real, single precision), which I "flatten" into 28500x1340. This uses very little memory (perhaps some few hundreds of MB) for most of the computing time for the SVD. However, there is a brief spike to more than 6 GB usage. What is causing this huge spike? Is there some way I can avoid it? It is limiting the data set size that I can use.

SVD memory spike

Gennady_F_Intel — Sat, 23 Jun 2012 07:49:30 GMT

did you check whatmkl_mem_stat( buf) returns in this case?

SVD memory spike

tinastone — Mon, 25 Jun 2012 18:44:49 GMT

Excellent, I'm very happy to know about this tool. The problem was elsewhere in my code. Thank you for pointing me to this function.

topic SVD memory spike in Intel® oneAPI Math Kernel Library

SVD memory spike

SVD memory spike

SVD memory spike