[bench] adjust the benchmarking code to be more meaningful

``` Benchmark Mode Cnt Score Error Units StringLoopBenchmark.benchLongDecodeStringLoop thrpt 5 10745.123 ± 194.012 ops/ms StringLoopBenchmark.benchLongJavaStringLoop thrpt 5 123630.568 ± 2992.694 ops/ms StringLoopBenchmark.benchLongRubyStringLoop thrpt 5 20841.347 ± 1095.569 ops/ms StringLoopBenchmark.benchShortDecodeStringLoop thrpt 5 15207.295 ± 933.209 ops/ms StringLoopBenchmark.benchShortJavaStringLoop thrpt 5 140604.846 ± 2555.282 ops/ms StringLoopBenchmark.benchShortRubyStringLoop thrpt 5 103548.193 ± 3440.039 ops/ms ```
jruby · May 25, 2018 · 7810ba0 · 7810ba0
1 parent 1a7a482
commit 7810ba0
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/bench/src/main/java/org/jruby/benchmark/StringLoopBenchmark.java b/bench/src/main/java/org/jruby/benchmark/StringLoopBenchmark.java
@@ -46,7 +46,8 @@ public void benchShortRubyStringLoop(final Blackhole blackhole) {
     @Benchmark
     @OperationsPerInvocation(INVOCATIONS)
     public void benchShortJavaStringLoop(final Blackhole blackhole) {
-        for (int i = 0; i < INVOCATIONS; i++) equalsJava(SHORT_STR, SHORT.decodeString(), blackhole);
+        final String str = SHORT.decodeString();
+        for (int i = 0; i < INVOCATIONS; i++) equalsJava(SHORT_STR, str, blackhole);
     }
 
     @Benchmark
@@ -64,7 +65,8 @@ public void benchLongRubyStringLoop(final Blackhole blackhole) {
     @Benchmark
     @OperationsPerInvocation(INVOCATIONS)
     public void benchLongJavaStringLoop(final Blackhole blackhole) {
-        for (int i = 0; i < INVOCATIONS; i++) equalsJava(LONG_STR, LONG.decodeString(), blackhole);
+        final String str = LONG.decodeString();
+        for (int i = 0; i < INVOCATIONS; i++) equalsJava(LONG_STR, str, blackhole);
     }
 
     @Benchmark