We found the performance deterioration occurs in 1.4.2 comparing with
that in 1.3.1.


REPRODUCE:
 
  (1) Compile the attached program
  (2) Launch "java CharsetTest01" in 1.3.1 and 1.4.2


RESULT :
 
  We can see different performance in the lists which the
  test program outputs.

  In 1.3.1_11,

K:\perf-char-set>java -version
java version "1.3.1_11"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_11-b02)
Java HotSpot(TM) Client VM (build 1.3.1_11-b02, mixed mode)

K:\perf-char-set>java CharsetTest01
Start
Finished: 651ms


However, in 1.4.2_03,


K:\perf-char-set>java -version
java version "1.4.2_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)
Java HotSpot(TM) Client VM (build 1.4.2_03-b02, mixed mode)

K:\perf-char-set>java CharsetTest01
Start
Finished: 23724ms


This seems to worse than 1.3.1.
We believe the 23.7[sec] in 1.4.2 is too slow than 0.7[sec] in 1.3.1 !!



CONFIGURATION :
  - OS : WindowsXP( SP1, Japanese )
  - MPU : Pentium IV 1.4[GHz]
  - Mem : 384[MB]
  - JRE : 1.4.2_03



NOTE:

In 1.5,

K:\perf-char-set>java -version
java version "1.5.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b38)
Java HotSpot(TM) Client VM (build 1.5.0-beta2-b38, mixed mode)

K:\shares2\fujitsu\perf-char-set>java CharsetTest01
Start
Finished: 6259ms


The perf. in 1.5 , 6.3[sec] seems to be better than 23[sec] in 1.4.2,
but still too slower than 0.6[sec] in 1.3.1.
 

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