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Fix race conditions caused by missing fences in OpenCL kernels for `cholesky_decompose`, `tridiagonalization` and `diag_inv` - #3432

Merged

andrjohns merged 8 commits into

stan-dev:developfrom

jachymb:bugfix/opencl-global-memory-fence

Oct 22, 2026

Merged

Fix race conditions caused by missing fences in OpenCL kernels for `cholesky_decompose`, `tridiagonalization` and `diag_inv`#3432
andrjohns merged 8 commits into
stan-dev:developfrom
jachymb:bugfix/opencl-global-memory-fence

Commits on Oct 4, 2026
- Test OpenCL cholesky_decompose with one work group of 200 work items
  Jachym.Barvinek
  committed
  d075c86
- Fix OpenCL cholesky_decompose kernel: barriers need a global memory fence
  Jachym.Barvinek
  committed
  d7d1d2e
- Fix OpenCL tridiagonalization_householder kernel: barrier needs a global memory fence
  Jachym.Barvinek
  committed
  0d308b6
- Fix OpenCL diag_inv kernel: global memory fence before the final copy
  Jachym.Barvinek
  committed
  a8fb654
- Remove the comment in the OpenCL cholesky_decompose one work group test
  Jachym.Barvinek
  committed
  1af67a2
Commits on Oct 21, 2026