Update README.md

Author: benjchristensen

src/perf/java/rx/README.md

@@ -17,7 +17,26 @@
 Optionally pass arguments for custom execution. Example:
 
 ```
-./gradlew benchmarks '-Pjmh=-f 1 -tu ns -bm avgt -wi 5 -i 5 -r 1 .*OperatorMapPerf.*'
+./gradlew benchmarks '-Pjmh=-f 1 -tu s -bm thrpt -wi 5 -i 5 -r 1 .*OperatorMapPerf.*'
+```
+
+gives output like this:
+
+```
+# Warmup Iteration   1: 17541564.529 ops/s
+# Warmup Iteration   2: 20923290.222 ops/s
+# Warmup Iteration   3: 20743426.176 ops/s
+# Warmup Iteration   4: 23462116.103 ops/s
+# Warmup Iteration   5: 24283139.706 ops/s
+Iteration   1: 23317338.378 ops/s
+Iteration   2: 23478480.189 ops/s
+Iteration   3: 23186077.043 ops/s
+Iteration   4: 22120569.854 ops/s
+Iteration   5: 21581828.652 ops/s
+
+Result: 22736858.823 ±(99.9%) 3223211.259 ops/s [Average]
+  Statistics: (min, avg, max) = (21581828.652, 22736858.823, 23478480.189), stdev = 837057.728
+  Confidence interval (99.9%): [19513647.564, 25960070.082]
 ```
 
 To see all options: