Just a little practice exercise: two implementations of reading the last 10 lines of a file.
Using hyperfine to benchmark the difference between the two methods.
Benchmarked on a 963k package-lock.json.
Results:
stream- 42msbackwards- 31ms
Most of that time is Node.js startup. For comparison, running node log.js which just runs console.log("hello") takes 27ms.
> hyperfine 'node ./index.js SOME_PATH/package-lock.json stream' 'node ./index.js SOME_PATH/package-lock.json backwards'
Benchmark #1: node ./index.js SOME_PATH/package-lock.json stream
Time (mean ± σ): 42.2 ms ± 1.0 ms [User: 40.9 ms, System: 7.9 ms]
Range (min … max): 40.8 ms … 44.6 ms 66 runs
Benchmark #2: node ./index.js SOME_PATH/package-lock.json backwards
Time (mean ± σ): 31.0 ms ± 0.7 ms [User: 28.8 ms, System: 3.7 ms]
Range (min … max): 30.0 ms … 33.9 ms 90 runs
Summary
'node ./index.js SOME_PATH/package-lock.json backwards' ran
1.36 ± 0.04 times faster than 'node ./index.js SOME_PATH/package-lock.json stream'