3 ms·
It really depends on the core. An SMT8 POWER8 core might see an 80% throughput increase going from 1 to 2 threads but those have been accused of being two SMT4
by Symmetry 5y ago
It really depends on the core. An SMT8 POWER8 core might see an 80% throughput increase going from 1 to 2 threads but those have been accused of being two SMT4 cores standing on each other's shoulders wearing a trenchcoat. 30% for a mainstream x86 consumer core is a good average expected value but it'll tend to vary a lot by workload with lower IPC tasks tending to get better results.