topic Re: PARDISO gets stuck in num. factorization for a general complex matrix in Intel® oneAPI Math Kernel Library

PARDISO gets stuck in num. factorization for a general complex matrix

rbunger — Mon, 26 Jan 2026 14:33:52 GMT

Hi,

PARDISO gets stuck in the numerical factorization step, for a general complex matrix. The matrix is too big to upload it (43 MB 7z archive).

OneAPI versions: 2025.3.0 and 2025.3.1

Thanks,

Rainer

rbunger — Tue, 03 Feb 2026 08:34:13 GMT

Update: I had to upload the matrix elsewhere. Intel has confirmed a bug and the fix will be in the 2026.0 release. Meanwhile two fixes are proposed:

1) use iparm[23]=1,

2) if there are even number of NUMA nodes, you could use spread-type binding by "OMP_PLACES=cores OMP_PROC_BIND=spread".

Many thanks to the Intel team & kind regards,

Rainer

rbunger — Tue, 03 Feb 2026 11:09:25 GMT

Option 2) has quite a large impact on the performance, in my case

Fengrui — Fri, 08 May 2026 20:15:37 GMT

Thanks again for reporting this issue. The fix is available in the latest 2026.0 release. Please check.

Thanks,

Fengrui

rbunger — Fri, 08 May 2026 21:00:00 GMT

Many thanks for the reminder. I have already performed tests and up to now everything is perfectly stable. Many thanks for your efforts!

Rainer