So I’m toying with my own database implementation and I’m getting ~20M writes per second. The write operation is a critical path that takes 1/20Mhz (ie 50ns). A

So I’m toying with my own database implementation and I’m getting ~20M writes per second. The write operation is a critical path that takes 1/20Mhz (ie 50ns). A sampling profiler will only capture max 1000hz (and even that is pushing it). And a hot spot here is 5-10ns probably. And similarly it could very well be memory transfer costs vs cpu which I’ve found hard to distinguish. I’ve had luck with valgrind but just reading individual instructions has been uninformative as the code path is too complex for that kind of analysis.