AMD Platform Optimization

please read for all developers

https://community.amd.com/thread/213045

Processor: 8 AuthenticAMD AMD FX-8320E Eight-Core Processor [Family 21 Model 2 Stepping 0]

Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 htt pni ssse3 fma cx16 sse4_1 sse4_2 popcnt aes f16c syscall nx lm avx sse4a osvw xop wdt fma4 topx page1gb rdtscp bmi1

Memory: 15.95 GB physical, 18.82 GB virtual

http://esa-space.blogspot.com/2017/ boinc optimization thoughts...

http://32ipi028l5q82yhj72224m8j.wpengine.netd...imizing-For-AMD-Ryzen.pdf

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AMD Software Optimization Guide for Ryzen
chromatix chromatix Apr 22, 2017 4:46 PM (in response to tagoo)
A slide deck on the subject got leaked a while ago. The executive summary, as far as I can remember it:

Don't use non-temporal accesses (unless you REALLY know what you're doing, and you probably don't).
Don't use manual prefetching. The automatic prefetchers work better, and don't consume decode bandwidth or op-cache space.
Organise your data in memory so that the automatic prefetchers are maximally effective. This may involve using structs-of-arrays instead of arrays-of-structs, or vice versa, depending on access patterns.
Minimise data movement between CCXes, as the bandwidth available between them is significantly less than within them. This may involve careful choice of worker-thread count and affinity.
SMT is new to AMD, but works similarly to Intel's HT and has similar tradeoffs. Ensure any thread affinity settings account for this.

Aside from the above, it is implied that Ryzen mostly responds well to code optimised for Intel CPUs. If the older AMD-specific ISA extensions are avoided, code optimised for older AMD CPUs should also run well, as long as the above guidelines are also accounted for.

Interestingly, adjusting existing code for the above guidelines seems to have a small net positive effect on Intel CPUs as well. This may obviate the need to have separate Intel and AMD code paths.

Agner Fog says he's nearly finished adding his analysis of Ryzen to his own famous optimisation manuals. This will no doubt be very illuminating."