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CPU profiling with Go's pprof on MacOS produces misleading results due to a long-standing MacOS issue with POSIX signal reporting. When profiling Dolt database performance, MacOS showed most CPU time in runtime.usleep and syscalls, while Ubuntu correctly identified the real bottleneck: unnecessary memory copies from passing large structs by value. Switching these structs to pointers yielded 5-21% performance improvements. The discrepancy stems from MacOS bias in attributing CPU time to syscalls rather than actual application code, making Ubuntu the recommended platform for accurate Go profiling.

Go CPU Profiling on MacOS is Broken

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