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Benchmarking different methods to take input from stdin

This repository was made to measure the performance of these methods to take integer input from stdin in C++:

  • std::cin
  • std::cin with sync_with_stdio set to false
  • scanf()
  • fastscan() - takes characters using getchar() and converts it into an integer
  • fastscan_unlocked() - takes character using getchar_unlocked() and converts it into an integer

Results

The results are available in the result directory and also given below.

Group Experiment Problem Space Samples Iterations Failure Baseline us/Iteration Iterations/sec Min (us) Mean (us) Max (us) Variance Standard Deviation Skewness Kurtosis Z Score
Input cin -9223372036854775808 30 10000 0 1 0.2602 3.8432e+06 2602 2687.6 2907 6323.9 79.523 1.14606 0.346018 1.07642
Input cin_wo_sync -9223372036854775808 30 10000 0 0.38432 0.1 1e+07 1000 1064.97 1265 3227.9 56.8146 2.64303 6.71072 1.14349
Input scanf -9223372036854775808 30 10000 0 0.37548 0.0977 1.02354e+07 977 1003.63 1056 387.413 19.6828 0.619739 0.242751 1.35313
Input fastscan -9223372036854775808 30 10000 0 0.13259 0.0345 2.89855e+07 345 352.967 367 29.6195 5.44238 0.364405 -0.238015 1.46382
Input fastscan_unlocked -9223372036854775808 30 10000 0 0.112606 0.0293 3.41297e+07 293 307.1 327 116.99 10.8162 0.00513204 -1.36834 1.3036

How to use

You can use the ./gen_result.sh to generate the results on your device.

Compiler and Device Specs

The specifications of the device on which these results were obtained are given below:

Component Specification
Compiler GNU 7.5.0
Processor Intel(R) Core(TM) i5-9300H
RAM 8 GB

The data used to generate the benchmark is given in the resource directory.