Criterion: robust, reliable performance measurement
This package provides the Criterion module, a Haskell library for measuring and analysing software performance.
To get started, read the online tutorial, and take a look at the programs in the examples directory.
Building and installing
To build and install criterion, just run
cabal install criterion
Please report bugs via the github issue tracker.
Master github repository:
git clone https://github.com/bos/criterion.git
There’s also a Mercurial mirror:
hg clone https://bitbucket.org/bos/criterion
(You can create and contribute changes using either Mercurial or git.)
This library is written and maintained by Bryan O’Sullivan, firstname.lastname@example.org.
- Unicode output is now correctly printed on Windows.
- Add Safe Haskell annotations.
--jsonoption for writing reports in JSON rather than binary format. Also: various bugfixes related to this.
If a benchmark uses
Criterion.envin a non-lazy way, and you try to use
--listto list benchmark names, you’ll now get an understandable error message instead of something cryptic.
We now flush stdout and stderr after printing messages, so that output is printed promptly even when piped (e.g. into a pager).
A new function
runModeallows custom benchmarking applications to run benchmarks with control over the
Added support for Linux on non-Intel CPUs.
This version supports GHC 8.
--only-runoption for benchmarks is renamed to
The dependency on the either package has been dropped in favour of a dependency on transformers-compat. This greatly reduces the number of packages criterion depends on. This shouldn’t affect the user-visible API.
The documentation claimed that environments were created only when needed, but this wasn’t implemented. (gh-76)
The package now compiles with GHC 7.10.
On Windows with a non-Unicode code page, printing results used to cause a crash. (gh-55)
- Bump lower bound on optparse-applicative to 0.11 to handle yet more annoying API churn.
- Added a lower bound of 0.10 on the optparse-applicative dependency, as there were major API changes between 0.9 and 0.10.