| Prepared by: | mduigou on Tue Mar 5 10:48:20 PST 2013 |
|---|---|
| Workspace: | /home/mike/code/jdk/jdk7u-dev/jdk |
| Compare against: | ssh://hg.openjdk.java.net/jdk7u/jdk7u-dev-gate/jdk |
| Compare against version: | 5809 |
| Summary of changes: | 165 lines changed: 39 ins; 96 del; 30 mod; 2545 unchg |
| Patch of changes: | jdk.patch |
| Bug id: | JDK-8006593 : Initialization bottleneck in Maps due to use of j.u.Random |
| Legend: |
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src/share/classes/java/util/HashMap.java
rev 5810 : 8006593: Performance and compatibility improvements to hash based Map implementations.
Summary: Use ThreadLocalRandom for hash seed rather than shared Random. Initialize {HashMap|Hashtable}.hashSeed only as needed. Minor optimizations.
Reviewed-by: alanb, bchristi
76 lines changed: 21 ins; 40 del; 15 mod; 1108 unchg
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src/share/classes/java/util/Hashtable.java
rev 5810 : 8006593: Performance and compatibility improvements to hash based Map implementations.
Summary: Use ThreadLocalRandom for hash seed rather than shared Random. Initialize {HashMap|Hashtable}.hashSeed only as needed. Minor optimizations.
Reviewed-by: alanb, bchristi
68 lines changed: 11 ins; 44 del; 13 mod; 1177 unchg
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src/share/classes/sun/misc/Hashing.java
rev 5810 : 8006593: Performance and compatibility improvements to hash based Map implementations.
Summary: Use ThreadLocalRandom for hash seed rather than shared Random. Initialize {HashMap|Hashtable}.hashSeed only as needed. Minor optimizations.
Reviewed-by: alanb, bchristi
21 lines changed: 7 ins; 12 del; 2 mod; 260 unchg
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