Bug ID: JDK-4401956 (cs) Precipitous drop in the Jetstream benchmark

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1.4.0 beta3Fixed

The Jestream Win32 benchmarks for read, write and parse text have dropped to level worse then 1.1.7 (our worst baseline.)  We have an unfortunate gap in our measurements due to other bug issues but we know it happend in the 12-19 to 12-28 time frame.

Its is worth noting that the copy benchmark seems un-effected. We guss that the key difference is that all the other benchamrks involve soem form of parsign of the bianry stream of bits while copy just mvoes bits from one file to another.

Measurement data is viewable using our Java Webstart (1.0) acessible applet at
http://javaweb.eng/engineering/jdk-performance/reports/NT4/jetstream.jnlp

* Added 1/9/01 eileeny

performance is also affected on linux platform.  With -server flag enabled, performance is worse that jdk1.2.2 without a jit.  copy benchmark is also affected.  see results at:
http://javaweb.eng/engineering/jdk-performance/engineering/linux/jetstream-comparison.jnlp

to recreate the bug:
java -cp /net/perf-lnx/export/performance perfteam.jetstream.JetStream -testfile IOTests.txt

* Added 1/10/01 zzhang

similiar performance regression has also been found on Solaris/sparc, please
check:  http://javaweb/engineering/jdk-performance/reports/solaris/

CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: generic FIXED IN: merlin-beta3 INTEGRATED IN: merlin-beta3

14-06-2004

EVALUATION This is a combination of several problems, the most serious of which is the fact that the HotSpot compilers do not yet inline or optimize sun.misc.Unsafe operations (4411596, 4411600, 4411601). Further investigation is in progress. -- mr@eng 2001/2/4 The redesign of the Charset API (4503732) brought the JetStream numbers down to more reasonable levels (see comments section for measurements). Further improvement is possible but the drop no longer qualifies as "precipitous", hence I'm closing this bug. -- ###@###.### 2001/10/2

10-09-0168

Duplicate :	JDK-4489049 - InputStreamReader performance has severely dropped from 1.3.1 to 1.4
Relates :	JDK-4411600 - Byte buffers significantly slower than arrays in C1
Relates :	JDK-4411601 - C2 does not appear to inline/optimize sun.misc.Unsafe operations
Relates :	JDK-4411596 - C1 does not inline sun.misc.Unsafe operations
Relates :	JDK-4503732 - (cs) Charset API redesign
Relates :	JDK-4435369 - (cs) Performance: CharsetDecoder.decode throws exceptions