Last December, I completed a half-year project to develop a continuous benchmarking system for the popular rustls library. My work was financed by ISRG, the makers of Let’s Encrypt, who are interested in rustls as a memory safe alternative to OpenSSL. The thing is, replacing OpenSSL is only realistic if you offer at least on-par performance. But how do you achieve that? What do you measure to ensure performance keeps improving and to avoid regressions?
