Using the criterion package to measure performance
For more reliable performance measures, the criterion
package comes in handy. The package description points out a major flaw in using simple procedures to time pure code.
"Because GHC optimizes aggressively when compiling with -O, it is potentially easy to write innocent-looking benchmark code that will only be evaluated once, for which all but the first iteration of the timing loop will be timing the cost of doing nothing."
Getting ready
Create a small.txt
file with a few words. Create a file, big.txt
, filled with text as follows:
$ wget norvig.com/big.txt
Install the criterion
library as follows:
$ cabal install criterion
How to do it…
- Import the package as follows:
import Criterion.Main
- Define the ...
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