I can spy on my CPU cycles with perf! by Julia Evans.
From the post:
Yesterday I talked about using perf to profile assembly instructions. Today I learned how to make flame graphs with
perftoday and it is THE BEST. I found this because Graydon Hoare pointed me to Brendan Gregg’s excellent page on how to useperf.
Julia is up to her elbows in her CPU.
You can throw hardware at a problem or you can tune the program you are running on hardware.
Julia’s posts are about the latter.