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@userchba userchba released this 30 Jul 05:18
· 56 commits to main since this release
v0.0.4
9c404ac

LibDDLA v0.0.4

C++17 distributed dense linear algebra library for GPUs (CUDA/HIP), ScaLAPACK-style 2D block-cyclic APIs over MPI. This release covers 57 commits since v0.0.3 (2026-05-21 → 2026-07-27).

Highlights

  • Unified CUDA/HIP batched GEMM backend (gemmVbatched / gemmVbatched2s) — a new vendor-neutral vbatched GEMM implementation shared across CUDA and HIP, supporting all four scalar types (float, double, std::complex<float>, std::complex<double>) with the public std::complex ABI preserved and thrust::complex used only internally (explicit FMA, no MAGMA dependency at runtime). (7aa2c1c)
  • License changed from GPL to LGPL v3, with MAGMA's BSD-3-Clause license included under LICENSES/ for the vbatched-derived kernel configs. (717e8db, 7aa2c1c)
  • README rewritten with accurate prerequisites, CMake option table, and build instructions for both CUDA and HIP backends. (e3eaaff, 3cbb91d, e8156f0, 9c404ac)

New Features

  • Non-pivoting LU factorization/solve family: pgetrf_nopiv, pgetrs_nopiv, pgesv_nopiv, and a MAGMA-derived getrf_nopiv. (32c54aa, 568c88b)
  • Banded-pivot LU factorization: pgetrf_bpiv. (46cdab2)
  • ppotrf_bottom_right / potrf_bottom_right — Cholesky factorization variants operating on the bottom-right submatrix. (f95af64)
  • pdam — distributed matrix scale/absolute-value-max style operation on a submatrix. (a629247)
  • axpy interface. (7d8bdb4)
  • pgemm transpose support (transa/transb ≠ 'N') plus general submatrix and non-square (n×m) MPI process grid support; ppotrf gained an upper-triangle (uplo == 'U') implementation. (1603864, dff3d79)
  • Template-based random matrix generator, replacing the old non-generic implementation. (fa36e4f)
  • deviceGetDeviceCount interface added to the device connector layer. (5e7a751)

Performance

  • Improved pgetrf performance by optimizing the underlying pgetf2 panel factorization. (159da24, fdc6ce2, 0aac709)
  • pgemm performance improvements alongside the transpose/submatrix support work. (589e3f6)
  • Removed a redundant world-communicator barrier from the triangular-factorization (*trf) code paths. (f1f3295)

Bug Fixes

  • Fixed pgemm correctness bug affecting asynchronous communication. (0d576d4)
  • Fixed pgeadd bugs when transa/transb ≠ 'N', and a separate pgeadd/pswap bug fix with accompanying tests. (a8fc255, fc5fdaf)
  • Fixed a rectangular block-size bug in the transport-block code path, and a related transport-block bug. (79c666e, 09938c0)
  • Fixed a laswp interface bug caused by CUDA/HIP differences, and a broader CUDA/HIP interface-difference bug on GPU/DCU platforms. (a0297b4, e15c96f)
  • Fixed HIP-specific bug. (7b5c888)
  • Fixed *_CHECK macros not reporting the correct file/line location. (e4066eb)
  • Added zero-size malloc and null-pointer free protection across allocation call sites. (0a42afc)

Build System / Tooling

  • Renamed the ENABLE_* CMake/compile-definition family to DDLA_USE_* for clarity. (2870801, 5b8fbb5)
  • Switched the DCU (HIP) compiler from hipcc to g++. (b8f8340)
  • Updated HIP install/build scripts and CUDA/HIP install scripts. (91f4100, 2a6252b, ac6c76c, 2a118b9)
  • Removed bench_pzgemm.cpp from src/ (moved/superseded by other benchmark updates) and cleaned up a stray tmp folder. (422ce7d, 1ff5713)
  • Updated .gitignore. (c1a78dc)
  • Added, then later removed, AGENTS.md contributor-agent instructions (no longer tracked in this repo). (8c55e6c, 8c5aa17, 3ddde74, 7b07283)

Tests & Benchmarks

  • Added a large batch of new API-grid regression tests covering pgeadd, pgemm, pgesv/pgesv_nopiv, pgetf2(+panel), pgetrf(+_bpiv/_nopiv), pgetrs(+_nopiv), plapiv, pposv, ppotrf(+_bottom_right), ppotrs, pswap, ptran, ptrtrs, a subcommunicator LU test, and transport-block tests. (a5227e8, and the feature commits above)
  • Added test_gemm_vbatched.cpp, test_pdam.cpp, test_getrf_nopiv.cpp, test_pgesv_nopiv.cpp, test_pgetrf_bpiv.cpp, test_pgetrf_nopiv.cpp, test_random_generate.cpp, and Hermitian-positive pgemm tests.
  • Updated pgetrf/ptrtrs/ppotrf_bottom_right benchmark drivers, including a cusolverMp-based pzgetrf benchmark for CUDA 11.8. (5fe65ff, 5530d58, abb8250)
  • Removed stray printf debug output from the LU factorization files. (acaa3f7)

Full changelog: v0.0.3...main (57 commits, 165 files changed, +26453/-3759 lines)

Note on tag naming: existing tags are v0.0.0, 0.0.2 (no v prefix), v0.0.3. This release recommends tagging as v0.0.4 to stay consistent with the majority convention.

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