GMSH defaults to single-threaded meshing. Setting General.NumThreads,
Mesh.MaxNumThreads1D and Mesh.MaxNumThreads2D to min(cpu_count, 16) enables
parallel Frontal-Delaunay surface meshing across all available cores.
Benchmark on 121-face assembly (32-core host, capped at 16 threads):
Before: 12.7s total (9.8s in gmsh.model.mesh.generate)
After: 2.8s total (1.1s in gmsh.model.mesh.generate)
Cap at 16 threads — benchmark showed 16 threads (1.1s) matches or beats auto
(1.6s), likely due to NUMA/coordination overhead above that threshold.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Hartmut
9703aec497