问题描述
我正在使用jmh对一个简单的应用程序进行基准测试(来自SO问题使用maven并遵循 http://openjdk.java.net/projects/code-tools/jmh/.成功设置并建立基准后，我会使用avgt模式获得以下基准结果:
I'm using jmh to benchmark a simple application (from SO question Unexpected Scalability results in java fork-join) using maven and following the command-line approach as advised in http://openjdk.java.net/projects/code-tools/jmh/. After successfully setting up and building the benchmark, I get the following benchmark results using the avgt mode:
C:\Users\username\my-app\test>java -jar target/benchmarks.jar -bm avgt -f 1
# JMH 1.10.1 (released 13 days ago)
# VM invoker: C:\Program Files\Java\jre1.8.0_45\bin\java.exe
# VM options: <none>
# Warmup: 20 iterations, 1 s each
# Measurement: 20 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: org.sample.MyBenchmark.testMethod
# Run progress: 0,00% complete, ETA 00:00:40
# Fork: 1 of 1
# Warmup Iteration 1: ? 10?? s/op
# Warmup Iteration 2: ? 10?? s/op
# Warmup Iteration 3: ? 10?? s/op
# Warmup Iteration 4: ? 10?? s/op
# Warmup Iteration 5: ? 10?? s/op
# Warmup Iteration 6: ? 10?? s/op
# Warmup Iteration 7: ? 10?? s/op
# Warmup Iteration 8: ? 10?? s/op
# Warmup Iteration 9: ? 10?? s/op
# Warmup Iteration 10: ? 10?? s/op
# Warmup Iteration 11: ? 10?? s/op
# Warmup Iteration 12: ? 10?? s/op
# Warmup Iteration 13: ? 10?? s/op
# Warmup Iteration 14: ? 10?? s/op
# Warmup Iteration 15: ? 10?¹? s/op
# Warmup Iteration 16: ? 10?? s/op
# Warmup Iteration 17: ? 10?¹? s/op
# Warmup Iteration 18: ? 10?? s/op
# Warmup Iteration 19: ? 10?¹? s/op
# Warmup Iteration 20: ? 10?¹? s/op
Iteration 1: ? 10?¹? s/op
Iteration 2: ? 10?¹? s/op
Iteration 3: ? 10?? s/op
Iteration 4: ? 10?¹? s/op
Iteration 5: ? 10?¹? s/op
Iteration 6: ? 10?? s/op
Iteration 7: ? 10?¹? s/op
Iteration 8: ? 10?? s/op
Iteration 9: ? 10?? s/op
Iteration 10: ? 10?¹? s/op
Iteration 11: ? 10?? s/op
Iteration 12: ? 10?? s/op
Iteration 13: ? 10?¹? s/op
Iteration 14: ? 10?? s/op
Iteration 15: ? 10?? s/op
Iteration 16: ? 10?¹? s/op
Iteration 17: ? 10?? s/op
Iteration 18: ? 10?¹? s/op
Iteration 19: ? 10?¹? s/op
Iteration 20: ? 10?¹? s/op
Result "testMethod":
? 10?¹? s/op
# Run complete. Total time: 00:00:40
Benchmark Mode Cnt Score Error Units
MyBenchmark.testMethod avgt 20 ? 10?¹? s/op
我不确定如何解释此输出，但是我确定某些地方出了错...?知道什么或如何调试它吗?
I'm not sure how to interpret this output, but I'm quite sure something went wrong...? Any idea what or how to debug this?
推荐答案
JMH输出使用扩展的Unicode字符.特别是， ? 10 ?? s/op"的意思可能是≈10×10 s/op".请使用正确支持Unicode的终端，请参见.
JMH output makes use of extended Unicode characters. In particular, ? 10?? s/op" probably means "≈ 10⁻¹⁰ s/op". Use a terminal that supports Unicode properly, see this.
除了Unicode麻烦之外，您的基准测试似乎太短了，因此JMH提出了一个数量级的估计值，而不是显示"0.000 s/op".
Apart from Unicode troubles, your benchmark seems to be too short, and so JMH presents an order of magnitude estimate instead of showing "0.000 s/op".
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