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Exploring The Zen 5 SMT Performance With The AMD EPYC 9755 "Turin" CPU
Continuing on with the testing around the AMD EPYC 9005 series 'Turin' processors, today is a look at the Simultaneous Multi-Threading (SMT) performance impact for Turin while using the AMD EPYC 9755 as the highest-end 'Turin Classic' processor with 128 cores / 256 threads.
Similar SMT on/off tests for "Turin Dense" with the EPYC 9965 192-core / 384-thread will also be coming in a future benchmarking comparison on Phoronix. I ran more than 170 different benchmarks for this comparison of running the EPYC 9755 processor with its Zen 5 "classic" cores while in the default SMT-enabled mode of operation and then with SMT disabled. Under Linux SMT can be easily disabled at boot time using the "nosmt" option or as most Phoronix readers are aware cores/threads can be offlined at run-time using the sysfs interface or in a more friendly manner via different utilities.
Or read this on Phoronix