JDK-6975829 : Perf. of gzip in existing JDKs is too slower than in 1.3.1
- Type: Bug
- Component: core-libs
- Sub-Component: java.util.jar
- Affected Version: 6u21
- Priority: P3
- Status: Closed
- Resolution: Fixed
- OS: windows_vista
- CPU: x86
- Submitted: 2010-08-10
- Updated: 2013-11-01
- Resolved: 2011-05-17
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| JDK 6 | JDK 7 |
|---|---|
| 6-poolResolved | 7 b116Fixed  |
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Description
A CU tries to migrate from 1.3.1_10 to jdk5ux. They found the perf. of gzip becomes too slower in jdk5ux than 1.3.1_XX. REPRODUCE : 1. Compile the attached DISTest.java 2. Invoke "java DISTest" CONFIGURATION: JDK: 1.4.2_22/5u22/6u21/7b99 OS: WindowsXP/WindowsVista(32bits on x64, Japanese) RESULT: CU reports that the perf. of gzip in the existing JDKs is 4 - 100 times worse than in 1.3.1. The following is the result of reproduction at Oracle side. Averagely, perf. seems 2 times worse than in 1.3.1. ----- C:\Users\licensees\slow-gzip>java -version java version "1.3.1_19" Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_19-b03) Java HotSpot(TM) Client VM (build 1.3.1_19-b03, mixed mode) C:\Users\licensees\slow-gzip>java DISTest finished. time: 489msecs. --------- C:\Users\licensees\slow-gzip>java -version java version "1.4.2_22" Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_22-b02) Java HotSpot(TM) Client VM (build 1.4.2_22-b02, mixed mode) C:\Users\licensees\slow-gzip>java DISTest finished. time: 1152msecs. --------- C:\Users\licensees\slow-gzip>java -version java version "1.5.0_22" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_22-b03) Java HotSpot(TM) Client VM (build 1.5.0_22-b03, mixed mode) C:\Users\licensees\slow-gzip>java DISTest finished. time: 1142msecs. ---------- C:\Users\licensees\slow-gzip>java -version java version "1.6.0_21" Java(TM) SE Runtime Environment (build 1.6.0_21-b06) Java HotSpot(TM) Client VM (build 17.0-b16, mixed mode) C:\Users\licensees\slow-gzip>java DISTest finished. time: 974msecs. ---------- C:\Users\licensees\slow-gzip>java -version java version "1.7.0-ea" Java(TM) SE Runtime Environment (build 1.7.0-ea-b99) Java HotSpot(TM) Client VM (build 19.0-b03, mixed mode) C:\Users\licensees\slow-gzip>java DISTest finished. time: 946msecs. NOTE: In quick check with hprof, load percentage of java.util.zip.Inflater.inflateBytes in the existing JDKs becomes high.
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