| Prepared by: | mduigou on Mon Mar 4 20:57:50 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: | 145 lines changed: 34 ins; 76 del; 35 mod; 2560 unchg |
| Patch of changes: | jdk.patch |
| Bug id: | JDK-8006593 : Initialization bottleneck in Maps due to use of j.u.Random |
| Legend: |
Modified file Deleted file New file |
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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
64 lines changed: 20 ins; 31 del; 13 mod; 1119 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
60 lines changed: 7 ins; 33 del; 20 mod; 1181 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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