Benchmark for java.nio.charset.Charset cache (original) (raw)
Ulf Zibis Ulf.Zibis at gmx.de
Tue Oct 13 13:55:50 UTC 2009
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Hi, Martin, Xueming,
I did a benchmark: unsynchronized 2-ElementCache ./. synchronized 4-ElementCache
Result: Usage: java -Xint -Xbootclasspath/p:..\build\classes;..\build\test\classes java.nio.charset.CharsetBenchmark As in real world, excessive loops on Charset.forName() are unlikely, only use interpreter mode here! Benchmark for 100000 from 1 charsets:
- time of unsynchronized 2-ElementCache: 40 + 42 = 82 ms
- time of synchronized 4-ElementCache: 48 + 49 = 97 ms Benchmark for 100000 from 2 charsets:
- time of unsynchronized 2-ElementCache: 83 + 90 = 173 ms
- time of synchronized 4-ElementCache: 138 + 110 = 248 ms Benchmark for 100000 from 3 charsets:
- time of unsynchronized 2-ElementCache: 801 + 823 = 1624 ms
- time of synchronized 4-ElementCache: 134 + 135 = 269 ms Benchmark for 100000 from 4 charsets:
- time of unsynchronized 2-ElementCache: 1232 + 1284 = 2516 ms
- time of synchronized 4-ElementCache: 142 + 145 = 287 ms Benchmark for 100000 from 5 charsets:
- time of unsynchronized 2-ElementCache: 1408 + 1547 = 2955 ms
- time of synchronized 4-ElementCache: 617 + 683 = 1300 ms Benchmark for 100000 from 6 charsets:
- time of unsynchronized 2-ElementCache: 1666 + 1671 = 3337 ms
- time of synchronized 4-ElementCache: 1086 + 995 = 2081 ms
For the sources see attachment.
-Ulf
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