What does the distribution level in JMH mean?

Question

I am trying to measure the memory consumed when running a test. I found out on the Internet that I can use a profiler GCto measure this. I tried, but I do not understand the answer, and also see the amount of memory consumed. Can someone explain the results? Thank.

MyBenchmark.testMethod_width_2_attribute_text                                     ss   60        32.345 ±       1.759   ms/op
MyBenchmark.testMethod_width_2_attribute_text:·gc.alloc.rate                      ss   60        26.904 ±       0.217  MB/sec
MyBenchmark.testMethod_width_2_attribute_text:·gc.alloc.rate.norm                 ss   60  14999630.400 ±      12.578    B/op
MyBenchmark.testMethod_width_2_attribute_text:·gc.churn.PS_Eden_Space             ss   60        28.282 ±      15.342  MB/sec
MyBenchmark.testMethod_width_2_attribute_text:·gc.churn.PS_Eden_Space.norm        ss   60  15903402.667 ± 8631257.013    B/op
MyBenchmark.testMethod_width_2_attribute_text:·gc.churn.PS_Survivor_Space         ss   60         0.654 ±       0.754  MB/sec
MyBenchmark.testMethod_width_2_attribute_text:·gc.churn.PS_Survivor_Space.norm    ss   60    368914.667 ±  425374.152    B/op
MyBenchmark.testMethod_width_2_attribute_text:·gc.count                           ss   60        26.000                counts
MyBenchmark.testMethod_width_2_attribute_text:·gc.time                            ss   60       105.000                    ms

Answer 1

Within jmh coatings uses ThreadMXBean, so it looks like a report that shows the number of bytes allocated for an operation, and how much MB/secin each space GC (eg Eden/Survivor)

.norm denotes normalized.