Blender 2.80 only using 1/4 cores of AMD Epyc 7601 #59938
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Reference: blender/blender#59938
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System Information
Windows 10 Pro 64-bit
Radeon Instinct Frontier Edition
AMD Epyc 7601 (32C/64T) in Gigabyte MZ32, all 8 DIMM channels populated (1DPC) 128GB total @ 2666
4x 970 Pro NVMe RAID-0 @ 9 GB/s Seq Read
blender-2.80-e5e885d0ecb9-win64 2018-12-23 21:42
Broken:
CPU rendering only (no OpenCL) only uses 8 cores, other 24C/48T idle. AMD Epyc 7601 presents as 4x NUMA nodes, 8 cores/16 threads each in NUMA display of TaskManager. Only NUMA node 0 is active @ 100%. Other 3 are idle.
Exact steps for others to reproduce the error
Launch Blender 2.80 by opening unmodified pavillon_barcelone_v1.2.blend
Render Image (F12)
Observe CPU usage in TaskManager & HWiNFO64
Same steps use all the cores on my dual-socket 16C/32T Xeon box. I assumed same on my single socket Epyc system. AMD 7601 @ 8C is 2.24x faster than my dual-socket 16 core E5 2650 system (21 min vs. 47 min). Peak @ 3.2Ghz, all 8 in NUMA node active during render pegged @ 2.7Ghz.
WARNING: absolute beginner doing 3D modeling of any kind, ~3 hours total with Blender. I searched bug list for EPYC, saw the Tweaks for TR2/Epyc. No recognizable resolution (for me) there.
Added subscriber: @BonsaiScott
Added subscriber: @LazyDodo
I'm pretty sure this got fixed this week, please try with a newer build first.
Added subscriber: @lichtwerk
Changed status from 'Open' to: 'Archived'
Since last asking for information it has been 7 or more days, due to the policy of our bug tracker we will have to archive the report until the requested information is given.