Dear all,

This is a snippet from the correspondence with SAP, who run into severe performance issues with JDK 1.4.2_10. No improvement has been observed with the recent release of JDK 1.4.2_18.
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In our BI application we have massive performance problems
because of java.util.zip.Deflater and Inflater. A lot of customer
cases and also several escalations resulted from this.

The problem is similar to that described in SUN bugid 6364346
and can be simply reproduced with the attached test program.

Just call: java -Xms1024M -Xmx1024M Bench test.htm

With 1.4.2_09 the performance is excellent, with later patch releases
it's horrible.

Following you see the results on my desktop PC:

C:\tmp\java\Deflater>\java\jdk1.4.2_09\bin\java -server -showversion
-Xms1024M -
Xmx1024M Bench test.htm
java version "1.4.2_09"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_09-b05)
Java HotSpot(TM) Server VM (build 1.4.2_09-b05, mixed mode)

Original length: 46932100 bytes
Deflated length: 2026929 bytes
Inflated length: 46932100 bytes

Duration of Deflate (in ms): 1390
Duration of Inflate (in ms): 3063

C:\tmp\java\Deflater>java -server -showversion -Xms1024M -Xmx1024M Bench
 test.ht
m
java version "1.4.2_18"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_18-b06)
Java HotSpot(TM) Server VM (build 1.4.2_18-b06, mixed mode)

Original length: 46932100 bytes
Deflated length: 2026929 bytes
Inflated length: 46932100 bytes

Duration of Deflate (in ms): 2602891
Duration of Inflate (in ms): 2421922

C:\tmp\java\Deflater>\java\jdk1.4.2_10\bin\java -server -showversion
-Xms1024M -
Xmx1024M Bench test.htm
java version "1.4.2_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_10-b03)
Java HotSpot(TM) Server VM (build 1.4.2_10-b03, mixed mode)

Original length: 46932100 bytes
Deflated length: 2026929 bytes
Inflated length: 46932100 bytes

Duration of Deflate (in ms): 8056797
Duration of Inflate (in ms): 7869140
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I've included a test case provided by SAP to this report. Please handle this case with high
priority because as mentioned above it has big impact at customer side.