I don’t know, but I doubt that was the problem. You wouldn’t feel optimizations for newer, vs targeting oldest 386. What you may feel is recompilations, or too much optimizations, triggering such.
Sys.CPU_NAME
gives you the LLVM target
julia> Sys.CPU_NAME
"skylake"
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They seem to be correctly identified. I get Cascade Lake for the Xeon and znver2 for the Epyc.
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