Mac specific nano time, updated benchmark

after

~/jdk8/jmh-nanotime (master) $ ../tl/build/macosx-x86_64-normal-server-release/jdk/bin/java -jar target/microbenchmarks.jar ".*" -wi 1 
-r 1
# Measurement Section
# Runtime (per iteration): 1s
# Iterations: 20
# Thread counts (concurrent threads per iteration): [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
# Threads will synchronize iterations
# Running: net.shipilev.generated.avgtime.NanotimeBenchmark.granularity
# Warmup Iteration   1 (3s in 1 thread): 30.972 nsec/op
Iteration   1 (1s in 1 thread): 31.418 nsec/op
Iteration   2 (1s in 1 thread): 31.175 nsec/op
Iteration   3 (1s in 1 thread): 31.441 nsec/op
Iteration   4 (1s in 1 thread): 31.344 nsec/op
Iteration   5 (1s in 1 thread): 31.432 nsec/op
Iteration   6 (1s in 1 thread): 31.334 nsec/op
Iteration   7 (1s in 1 thread): 31.453 nsec/op
Iteration   8 (1s in 1 thread): 31.295 nsec/op
Iteration   9 (1s in 1 thread): 31.282 nsec/op
Iteration  10 (1s in 1 thread): 32.056 nsec/op
Iteration  11 (1s in 1 thread): 31.938 nsec/op
Iteration  12 (1s in 1 thread): 31.341 nsec/op
Iteration  13 (1s in 1 thread): 31.346 nsec/op
Iteration  14 (1s in 1 thread): 31.250 nsec/op
Iteration  15 (1s in 1 thread): 31.235 nsec/op
Iteration  16 (1s in 1 thread): 31.202 nsec/op
Iteration  17 (1s in 1 thread): 31.278 nsec/op
Iteration  18 (1s in 1 thread): 31.194 nsec/op
Iteration  19 (1s in 1 thread): 31.179 nsec/op
Iteration  20 (1s in 1 thread): 31.198 nsec/op

Run result "granularity": 31.370 ±(95%) 0.109 ±(99%) 0.149 nsec/op
Run statistics "granularity": min = 31.175, avg = 31.370, max = 32.056, stdev = 0.233
Run confidence intervals "granularity": 95% [31.261, 31.479], 99% [31.221, 31.519]


# Runtime (per iteration): 1s
# Iterations: 20
# Thread counts (concurrent threads per iteration): [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
# Threads will synchronize iterations
# Running: net.shipilev.generated.avgtime.NanotimeBenchmark.latency
# Warmup Iteration   1 (3s in 1 thread): 30.438 nsec/op
Iteration   1 (1s in 1 thread): 31.041 nsec/op
Iteration   2 (1s in 1 thread): 30.788 nsec/op
Iteration   3 (1s in 1 thread): 30.770 nsec/op
Iteration   4 (1s in 1 thread): 30.824 nsec/op
Iteration   5 (1s in 1 thread): 30.690 nsec/op
Iteration   6 (1s in 1 thread): 30.637 nsec/op
Iteration   7 (1s in 1 thread): 30.647 nsec/op
Iteration   8 (1s in 1 thread): 30.834 nsec/op
Iteration   9 (1s in 1 thread): 30.580 nsec/op
Iteration  10 (1s in 1 thread): 30.636 nsec/op
Iteration  11 (1s in 1 thread): 30.805 nsec/op
Iteration  12 (1s in 1 thread): 30.788 nsec/op
Iteration  13 (1s in 1 thread): 30.597 nsec/op
Iteration  14 (1s in 1 thread): 30.640 nsec/op
Iteration  15 (1s in 1 thread): 30.655 nsec/op
Iteration  16 (1s in 1 thread): 30.882 nsec/op
Iteration  17 (1s in 1 thread): 30.815 nsec/op
Iteration  18 (1s in 1 thread): 30.686 nsec/op
Iteration  19 (1s in 1 thread): 30.750 nsec/op
Iteration  20 (1s in 1 thread): 30.709 nsec/op

Run result "latency": 30.739 ±(95%) 0.053 ±(99%) 0.072 nsec/op
Run statistics "latency": min = 30.580, avg = 30.739, max = 31.041, stdev = 0.113
Run confidence intervals "latency": 95% [30.686, 30.792], 99% [30.667, 30.811]


Benchmark                               Thr    Cnt  Sec         Mean   Mean error          Var    Units
n.s.g.a.NanotimeBenchmark.granularity     1     20    1       31.370        0.149        0.054  nsec/op
n.s.g.a.NanotimeBenchmark.latency         1     20    1       30.739        0.072        0.013  nsec/op

before

~/jdk8/jmh-nanotime (master) $ ../tl/build/macosx-x86_64-normal-server-release/jdk/bin/java -jar target/microbenchmarks.jar ".*" -wi 1 
-r 1
# Measurement Section
# Runtime (per iteration): 1s
# Iterations: 20
# Thread counts (concurrent threads per iteration): [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
# Threads will synchronize iterations
# Running: net.shipilev.generated.avgtime.NanotimeBenchmark.granularity
# Warmup Iteration   1 (3s in 1 thread): 1008.637 nsec/op
Iteration   1 (1s in 1 thread): 1008.639 nsec/op
Iteration   2 (1s in 1 thread): 1009.404 nsec/op
Iteration   3 (1s in 1 thread): 1007.838 nsec/op
Iteration   4 (1s in 1 thread): 1007.723 nsec/op
Iteration   5 (1s in 1 thread): 1008.413 nsec/op
Iteration   6 (1s in 1 thread): 1008.409 nsec/op
Iteration   7 (1s in 1 thread): 1007.779 nsec/op
Iteration   8 (1s in 1 thread): 1007.584 nsec/op
Iteration   9 (1s in 1 thread): 1010.090 nsec/op
Iteration  10 (1s in 1 thread): 1009.704 nsec/op
Iteration  11 (1s in 1 thread): 1008.385 nsec/op
Iteration  12 (1s in 1 thread): 1008.105 nsec/op
Iteration  13 (1s in 1 thread): 1008.074 nsec/op
Iteration  14 (1s in 1 thread): 1008.236 nsec/op
Iteration  15 (1s in 1 thread): 1007.784 nsec/op
Iteration  16 (1s in 1 thread): 1007.835 nsec/op
Iteration  17 (1s in 1 thread): 1008.396 nsec/op
Iteration  18 (1s in 1 thread): 1009.186 nsec/op
Iteration  19 (1s in 1 thread): 1007.952 nsec/op
Iteration  20 (1s in 1 thread): 1008.167 nsec/op

Run result "granularity": 1008.385 ±(95%) 0.326 ±(99%) 0.446 nsec/op
Run statistics "granularity": min = 1007.584, avg = 1008.385, max = 1010.090, stdev = 0.697
Run confidence intervals "granularity": 95% [1008.059, 1008.711], 99% [1007.939, 1008.831]


# Runtime (per iteration): 1s
# Iterations: 20
# Thread counts (concurrent threads per iteration): [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
# Threads will synchronize iterations
# Running: net.shipilev.generated.avgtime.NanotimeBenchmark.latency
# Warmup Iteration   1 (3s in 1 thread): 36.095 nsec/op
Iteration   1 (1s in 1 thread): 36.287 nsec/op
Iteration   2 (1s in 1 thread): 36.299 nsec/op
Iteration   3 (1s in 1 thread): 36.329 nsec/op
Iteration   4 (1s in 1 thread): 36.340 nsec/op
Iteration   5 (1s in 1 thread): 36.289 nsec/op
Iteration   6 (1s in 1 thread): 36.353 nsec/op
Iteration   7 (1s in 1 thread): 36.442 nsec/op
Iteration   8 (1s in 1 thread): 36.668 nsec/op
Iteration   9 (1s in 1 thread): 36.386 nsec/op
Iteration  10 (1s in 1 thread): 36.349 nsec/op
Iteration  11 (1s in 1 thread): 36.263 nsec/op
Iteration  12 (1s in 1 thread): 36.341 nsec/op
Iteration  13 (1s in 1 thread): 36.464 nsec/op
Iteration  14 (1s in 1 thread): 36.265 nsec/op
Iteration  15 (1s in 1 thread): 36.372 nsec/op
Iteration  16 (1s in 1 thread): 36.304 nsec/op
Iteration  17 (1s in 1 thread): 36.328 nsec/op
Iteration  18 (1s in 1 thread): 36.262 nsec/op
Iteration  19 (1s in 1 thread): 36.331 nsec/op
Iteration  20 (1s in 1 thread): 36.367 nsec/op

Run result "latency": 36.352 ±(95%) 0.043 ±(99%) 0.059 nsec/op
Run statistics "latency": min = 36.262, avg = 36.352, max = 36.668, stdev = 0.092
Run confidence intervals "latency": 95% [36.309, 36.395], 99% [36.293, 36.411]


Benchmark                               Thr    Cnt  Sec         Mean   Mean error          Var    Units
n.s.g.a.NanotimeBenchmark.granularity     1     20    1     1008.385        0.446        0.486  nsec/op
n.s.g.a.NanotimeBenchmark.latency         1     20    1       36.352        0.059        0.008  nsec/op

system specs

Hardware Overview:

  Model Name:  Mac mini
  Model Identifier:	Macmini6,2
  Processor Name:	Intel Core i7
  Processor Speed:	2.6 GHz
  Number of Processors:	1
  Total Number of Cores:	4
  L2 Cache (per Core):	256 KB
  L3 Cache:	6 MB
  Memory:	16 GB