BLIS on RISC-V: RVV build + DGEMM performance A/B vs OpenBLAS#19
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Build BLIS (flame/blis rv64iv, RVV 1.0 hand-written asm gemm kernels) under EESSI GCC 14.3.0 with OpenMP threading, validate correctness, and A/B its DGEMM throughput against the patched RVV OpenBLAS on the SpaceMiT X60. Measured (Orange Pi RV2, VLEN=256, -O3 -march=rv64imafdcv_zvl256b): - 1 thread: BLIS beats OpenBLAS 1.21-1.29x at N>=2048 (RVV asm microkernel) - 8 threads: OpenBLAS scales better, BLIS 0.80-0.89x - CTRSM correctness: 2400 cases, 0 fails, worst_resid 2.55e-07 No FlexiBLAS on the board, so the A/B links the same backend-agnostic bench_dgemm.c against each library in turn (one variable = the BLAS impl). Documents the two EESSI GCC14 link gotchas (-L/-B $GCC14/lib for libgcc_s/libatomic/libgomp.spec) and the module-load PATH trap.
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Adds a
BLIS/benchmark package: builds BLIS (flame/blis,rv64ivtarget — RVV 1.0 with the hand-written RVV assembly gemm microkernels inkernels/rviv/3/) under the EESSI GCC 14.3.0 toolchain with OpenMP threading, verifies numerical correctness, and A/Bs its DGEMM throughput against the patched RVV OpenBLAS on the SpaceMiT X60 (Orange Pi RV2, VLEN=256).Why link, not FlexiBLAS
FlexiBLAS is not installed on the RV2, so the A/B links the same backend-agnostic
bench_dgemm.cagainst each library in turn — one variable changed (the BLAS impl), source and flags held constant.Results (Orange Pi RV2 / X60,
-O3 -march=rv64imafdcv_zvl256b, EESSI GCC 14.3.0)DGEMM GFLOP/s:
C[0]=245.24identical for both backends at every size — no NaN.Correctness (
verify_ctrsm, BLISrv64iv): 2400 cases, 0 fails, worst_resid=2.55e-07.Contents
build-blis.sh— clone + configure (rv64iv --enable-cblas --enable-blas --enable-threading=openmp) + build under EESSI GCC 14.3.0.run-ab.sh— linkbench_dgemm.cagainst BLIS and OpenBLAS, sweep sizes × threads, print GFLOP/s + ratio.bench_dgemm.c/difftest.c/verify_ctrsm.c— backend-agnostic perf + correctness harnesses (shared withOpenBLAS/).README.md— build/run/A-B methodology, results, and the two EESSI GCC14 link gotchas (-L/-B $GCC14/libforlibgcc_s/libatomic/libgomp.spec; themodule loadPATH trap).Branched off the same clean base as #18 (no unrelated gromacs history).