andrey at tweak.su
Tue Apr 26 22:21:33 UTC 2016
I create simple benchmark (attached). Optimized version more faster:
# JMH 1.12 (released 26 days ago)
# VM version: JDK 1.8.0_91, VM 25.91-b14
# Run complete. Total time: 00:04:02
Benchmark Mode Cnt Score Error Units
StringBenchmark.constConst thrpt 20 37935470,179 ▒ 158354,736 ops/s
StringBenchmark.constConstFast thrpt 20 70342038,623 ▒ 727831,951 ops/s
StringBenchmark.newNew thrpt 20 30033885,754 ▒ 374524,932 ops/s
StringBenchmark.newNewFast thrpt 20 69567918,934 ▒ 196494,474 ops/s
StringBenchmark.varVar thrpt 20 36102111,956 ▒ 364861,774 ops/s
StringBenchmark.varVarFast thrpt 20 66743826,698 ▒ 124162,725 ops/s
How I can publish my version equalsIgnoreCase(...) or OpenJDK team check results separately?
26.04.2016, 18:18, "Andrew Haley" <aph at redhat.com>:
> On 04/26/2016 03:25 PM, Andrey wrote:
>> May be can create optimized regionMatches(...) for use in equalsIgnoreCase(...)?
> When the HotSpot JVM's just-in-time compiler optimizes this code it
> inlines all of these tests, realizes that they are constant values,
> and generates no code for them. All the generated code does is check
> that the strings have the same coder and are the same length, then it
> goes into an unrolled loop checking that the characters are the same.
> If they're different then we have to do some more testing.
> If you want to optimize any library code its a great idea to make some
> changes and use JMH (http://openjdk.java.net/projects/code-tools/jmh/)
> to see if your change makes your test run faster.
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