- Dec 5, 2015
You can, by selecting "single core per compute unit" (standard AGESA downcore).Regarding Excavator- can you disable CMT in BIOS?
Regarding Himeno and Nbody- is it likely another size of these BM would give a very different result?
3D Euler seem do be hard to predict- Caselab and CFD are very different.
3D Euler tested at techreport.com is even worse for Ryzen.
Alternatively you can set a mask of 0xA to the downcore PCI register (check BKDG). That will disabled the slave cores within the CU.
Neither Himeno or NBody results change when the grid-size (Himeno) or body count (NBody) is changed.
Techreport didn't use patched version of Caselab Euler3D, like I did.
The program is extremely old and has been compiled with a ICL version of that ERA (pre court ruling), meaning it features a hostile CPU vendor dispatcher.
Unless the dispatcher is removed through patching, it significantly degrades the performance on AMD CPUs. The difference can be as high as 30% (SSE vs. SSE2, IIRC).