Issues

• VlasovAmpereOneSpecies: total_energy jumps after the first step with the control variate (and is offset at t=0 with full-f weights)

  bug
  struphy-hub/struphy#767 · Filter by author spossann opened on Oct 13, 2026

• Initial Poisson solve: default stabilization puts net charge / 1e-14 into phi, E loses digits

  bug
  struphy-hub/struphy#766 · Filter by author spossann opened on Oct 13, 2026

• draw_markers does not MPI-sort the markers without sorting boxes (off-rank markers in setup accumulations, segfault on 2 ranks)

  bug
  struphy-hub/struphy#764 · Filter by author spossann opened on Oct 13, 2026

• Investigate reducing particle counts and timesteps at fixed scientific accuracy

  struphy-hub/struphy#756 · Filter by author max-models opened on Oct 12, 2026

• Reduce global synchronization in particle migration and Krylov solves

  struphy-hub/struphy#755 · Filter by author max-models opened on Oct 12, 2026

• Batch particle kernels by spatial tiles and reuse basis/geometry evaluations

  struphy-hub/struphy#754 · Filter by author max-models opened on Oct 12, 2026

• Reduce nonlinear MHD assembly and inner-solve work with inexact Newton

  struphy-hub/struphy#753 · Filter by author max-models opened on Oct 12, 2026

• Scale multigrid with coarse-level rank reduction and robust geometry support

  struphy-hub/struphy#752 · Filter by author max-models opened on Oct 12, 2026

• Add factored gather–multiply–scatter particle coupling operators

  struphy-hub/struphy#751 · Filter by author max-models opened on Oct 12, 2026

• Use sum factorization and partial assembly for FEEC operator application

  struphy-hub/struphy#750 · Filter by author max-models opened on Oct 12, 2026

• PolarVector: tp setter and set_tp_rings_to_zero leave ghost_regions_in_sync unchanged

  buglow
  struphy-hub/struphy#748 · Filter by author spossann opened on Oct 11, 2026

• Parallel projector solves ~100x slower: BLAS thread oversubscription under MPI

  AIbug
  struphy-hub/struphy#743 · Filter by author spossann opened on Oct 10, 2026

• GuidingCenter en_fB sums over holes and ghosts; test_scalars en_fB tests fail on devel

  AIbugmedium
  struphy-hub/struphy#727 · Filter by author max-models opened on Oct 7, 2026

• SortingBoxes cannot be created on the CuPy backend

  bugCUDAGPU
  struphy-hub/struphy#726 · Filter by author max-models opened on Oct 7, 2026

• Port GVEC to GPU

  struphy-hub/struphy#715 · Filter by author max-models opened on Oct 7, 2026

• GPU: row-major marker buffer and hole rows make column operations bandwidth-bound

  GPU
  struphy-hub/struphy#707 · Filter by author max-models opened on Oct 7, 2026
  4

• Compile cuda kernels in setup stage

  CUDAGPU
  struphy-hub/struphy#704 · Filter by author max-models opened on Oct 7, 2026

• cunumpy features that would replace struphy helpers

  CUDAGPU
  struphy-hub/struphy#700 · Filter by author max-models opened on Oct 7, 2026

• GPU runner in CI for the CUDA tests

  CUDAGPU
  struphy-hub/struphy#699 · Filter by author max-models opened on Oct 7, 2026

• Multi-rank marker exchange with CUDA-aware MPI

  CUDAGPU
  struphy-hub/struphy#698 · Filter by author max-models opened on Oct 7, 2026

• MHD equilibria on the CuPy backend

  CUDAGPU
  struphy-hub/struphy#696 · Filter by author max-models opened on Oct 7, 2026

• Port the diffusion and SPH kernels to CUDA

  CUDAGPU
  struphy-hub/struphy#694 · Filter by author max-models opened on Oct 7, 2026

• Port the hybrid 5D kernels to CUDA

  CUDAGPU
  struphy-hub/struphy#693 · Filter by author max-models opened on Oct 7, 2026

• Port the hybrid MHD-kinetic 6D kernels to CUDA (current and pressure coupling)

  CUDAGPU
  struphy-hub/struphy#692 · Filter by author max-models opened on Oct 7, 2026

• Port the guiding-centre kernels to CUDA (ToyDrift, DriftKineticElectrostaticAdiabatic)

  CUDAGPU
  struphy-hub/struphy#691 · Filter by author max-models opened on Oct 7, 2026