FAQ / Troubleshooting

I requested many eigenpairs and runtime increased. Is this expected?

Yes. howmany affects polynomial/filter and factorization behavior. Check reporting output to inspect order and iteration balance.

Why did factorization type change?

It depends on x0:

  • vector x0 -> Lanczos
  • matrix x0 -> Block Lanczos

Which mapping keyword should I use?

Use parallel_strategy inside MappingConfig.

My run is slow. What should I test first?

  1. produce_report=true and inspect mapping/factorization timings with display_report.
  2. Try optimize_mapping=true in MappingConfig.
  3. For structured models, build custom mapping and optionally custom rescaled/Clenshaw kernels.

How do I debug setup issues?

Increase verbosity:

Polfed.Common.verbosity[] = 3

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