Hi Janek,
On 18/10/12 10:23, Janek S. wrote:
during past few days I spent a lot of time trying to figure out how to write
Criterion benchmarks,
so that results don't get skewed by lazy evaluation. I want to benchmark
different versions of an
algorithm doing numerical computations on a vector. For that I need to create
an input vector
containing a few thousand elements. I decided to create random data, but that
really doesn't
matter - I could have as well use infinite lists instead of random ones.
[snip]
The question is how to generate data so that its evaluation won't be included
in the benchmark.
Something like this might work, not sure what the canonical way is.
---8<---
main = do
...
let input = L.dataBuild gen
evaluate (rnf input)
defaultMain
...
bench "Lists" $ nf L.benchThisFunction input
...
---8<---
I did use something like this in practice here:
https://gitorious.org/bitwise/bitwise/blobs/master/extra/benchmark.hs#line155
Thanks,
Claude
--
http://mathr.co.uk
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