My output not showing the full numbers but showing ?? instead

Question

I'm trying to do benchmarking with JMH, the benchmarking result did come out but not perfectly

Somehow there's ?? in the numbers, is it the problem with my IDE where I need to set up the settings to show the full numbers or something?

I think the first is supposed to be `±`, I'm not sure about the second and third. The character set of your console probably doesn't support it. Are you running on Windows? — Mark Rotteveel, Mar 24 '22 at 08:54

score 1 · Answer 1 · answered Mar 24 '22 at 10:20

1

The JMH output makes use of extended Unicode characters. In particular, ? 10?? s/op" probably means "≈ 10⁻¹⁰ s/op".

To solve it

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
public class MyBenchmark {

answered Mar 24 '22 at 10:20

Lorale

113
6

score 1 · Answer 2 · answered Apr 19 '22 at 07:38

What you are facing is an encoding issue.

JMH by default encodes its output as UTF-8 so instead of those ?? you'll see ± for Error column and e.g. ≈ 10⁻³ for Score column on Linux or Mac.

On Windows Unicode is supported in terminal but not entirely, this is why you see ?? instead of some symbols. To fix this please follow the manual described in another SO question: How to use unicode characters in Windows command line?

My output not showing the full numbers but showing ?? instead

2 Answers2

Linked

Related