Chronos

chronos performs lazy benchmarking of shell commands with continuous feedback and improving precision.

Please look at the documentation of the module for an overview of the api: Chronos.Bench

How does it work?

chronos will benchmark the specified commands until you abort it with ctrl-c or it reaches some termination criterion specified by the command line. It updates every iteration the measurements of the benchmarks so you can terminate it when you're satisfied with the presented precision. It will intersperse all benchmarks for fastest possible overview and to distribute any external load over all benchmarks to improve precision.

Options

chronos presents rich command line options.

You can as well use autocomplete of your shell with following command:

source <(chronos --bash-completion-script `which chronos`)

Normally, the output of --bash-completion-script should be coppied in the appropriate directory.

Library

You can use chronos as a haskell library to benchmark pure or impure functions or shell commands.

module Main where import Chronos.Bench main :: IO () main = defaultMain [ bench "fib 1" fib 1 , bench "fib 2" fib 2 , bench "fib 4" fib 4 , bench "fib 8" fib 8 ] fib :: Int -> Int fib 1 = 1 fib 2 = 1 fib n = fib (n-1) + fib (n-2)

module Main where import Chronos.Bench import Control.Concurrent import Data.IORef main :: IO () main = defaultMain [ benchIO "ioref" (newIORef True) , benchIO "mvar" (newMVar True) , benchIO "qsem" (newQSem 5) , benchIO "chan" (newChan :: IO (Chan Int)) ]

module Main where import Chronos.Bench main :: IO () main = defaultMain [ benchShell "sleep is slow" "sleep 0" , benchShell "echo is fast" "echo" , benchShell "true is faster" "true" ]

Comparison

Comparing chronos to bench and hyperfine :

chronos

intersperses all benchmarks, therefore allowing you fast comparisons

uses scientific notation

is more robust to external loads because ouf the interspersing (it will affect all benchmarks and not only some)

uses a number of significant digits according to the current standard error (so with time more digits are presented and not always 4 which is often the wrong thing to do)

uses bars with confidence intervals on the command line for easy comparison

Comparing chronos to criterion :

chronos