Paderborn Center for Parallel Computing (PC2)
National High-Performance Computing Alliance (NHR)

Noctua 1

System: Noctua 1 (single and dual-socket Intel Xeon Gold "Skylake" 6148 20-Core CPUs)

• 20 cores -> single-socket
• 40 cores -> dual-socket (full node)

BLAS	# cores	size	GFLOPS
Intel MKL v2022.0.0 (JLL)	40 cores	10240	2081
Intel MKL v2022.0.0 (JLL)	20 cores	10240	1054
BLIS 0.9.0 (JLL)	40 cores	10240	1890
BLIS 0.9.0 (JLL)	20 cores	10240	990
Octavian 0.3.15	40 cores	10240	1053
Octavian 0.3.15	20 cores	10240	1016
OpenBLAS 0.3.20 (shipped with Julia 1.8)	40 cores	10240	1092
OpenBLAS 0.3.20 (shipped with Julia 1.8)	20 cores	10240	1063
---------------------	-----------	-------	------
OpenBLAS 0.3.17 (custom)	40 cores	10240	1908
OpenBLAS 0.3.17 (custom)	20 cores	10240	1439
OpenBLAS 0.3.20 (custom)	40 cores	10240	1897
OpenBLAS 0.3.20 (custom)	20 cores	10240	1444
---------------------	-----------	-------	------
OpenBLAS 0.3.17 (JLL)	40 cores	10240	1437
OpenBLAS 0.3.17 (JLL)	20 cores	10240	1124
OpenBLAS 0.3.20 (JLL)	40 cores	10240	1535
OpenBLAS 0.3.20 (JLL)	20 cores	10240	1185

Bold: Needs fixing on either my or the package side? (see https://github.com/JuliaLang/julia/issues/46123)

Noctua 2

System: Noctua 2 (single and dual-socket AMD EPYC Milan 7763 64-Core CPUs)

• 64 cores -> single-socket
• 128 cores -> dual-socket (full node)

BLAS	# cores	size	GFLOPS
Intel MKL v2022.0.0 (JLL)	128 cores	10240	3287
Intel MKL v2022.0.0 (JLL)	64 cores	10240	1679
BLIS 0.9.0 (JLL)	128 cores	10240	3935
BLIS 0.9.0 (JLL)	64 cores	10240	2033
Octavian 0.3.15	128 cores	10240	1854
Octavian 0.3.15	64 cores	10240	1869
OpenBLAS 0.3.20 (shipped with Julia 1.8)	128 cores	10240	2305
OpenBLAS 0.3.20 (shipped with Julia 1.8)	64 cores	10240	2284

Bold: Needs fixing on either my or the package side?

Notes

• Julia version 1.8.0-beta3 since the maximal number of OpenBLAS threads is fixed to 32 in 1.7 (current stable version).