Hyperfine is hyper frustrating because it only works with really really fine microsecond level benchmarks. Once you get into the millisecond range it’s worthless.
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But for everything in the right range (milliseconds, seconds, minutes or above), hyperfine is well suited.
Back in the day my goal for Advent of Code was to run all solutions in under 1 second total. Hyperfine would take like 30 minutes to benchmark a 1 second runtime.
It was hyper frustrating. I could not find a good way to get Hyperfine to do what I wanted.
Current defaults: "By default, it will perform at least 10 benchmarking runs and measure for at least 3 seconds." If your program takes 1s to run, it should take 10 seconds to benchmark.
Is it possible that your program was waiting for input that never came? One "gotcha" is that it expects each argument to be a full program, so if you ran `hyperfine ./a.out input.txt`, it will first bench a.out with no args, then try to bench input.txt (which will fail). If a.out reads from stdin when no argument is given, then it would hang forever, and I can see why you'd give up after a half hour.