ianchb f345b0e520 Performance optimization for the TwoPunctures module ...

* Re-enabled OpenMP.

1. Batch spectral derivatives (Chebyshev & Fourier) via precomputed matrices:
Chebyshev/Fourier transforms and derivatives are precomputed as explicit physical-space operator matrices.
Batch DGEMM now applies to entire tensor fields, mathematically identical to original per-line transforms but vastly faster.

2. Gauss-Seidel relaxation & tridiagonal solver workspace reuse:
Per-thread reusable workspaces replace per-call heap new/delete in all tridiagonal and relaxation routines.

3. Efficient OpenMP multithreading throughout relaxation/deriv:
relax_omp and friends parallelize over grouped lines/planes, maximizing threading efficiency and memory independence.

Co-authored-by: copilot-swe-agent[bot] <198982749+copilot@users.noreply.github.com>

2026-02-07 14:48:47 +08:00

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