FULL PRODUCT VERSION : java version "1.5.0" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64) Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode, sharing) FULL OS VERSION : Linux www.my2do.com 2.6.8-1.521 #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux EXTRA RELEVANT SYSTEM CONFIGURATION : Fedora core 2, Kernel 2.6.8-1 A DESCRIPTION OF THE PROBLEM : Very high context switch rate observed under Fedora Core 2 when running any Java application (even when the applicaiton is idle, and doing nothing). Can be demonstrated by running SwingSet2 demo. Under previous JVM (tested on 1.4.2_01 and 1.4.2_06), context switch rate (as reported by vmstat) is approx 600/per second. Under JDK 5.0, context switch rate is approx. 1500/second . -Xint makes no difference -server make no difference This makes the system very slow - even though the cpu utilization is very low ( < 5%) and there is plenty of memory (512 MB). STEPS TO FOLLOW TO REPRODUCE THE PROBLEM : In a shell window run vmstat 5, watch the cs (context switch) rate Run any Swing application (e.g. java -jar SwingSet2.jar) EXPECTED VERSUS ACTUAL BEHAVIOR : Expect cs to be <600 Actual is >1500 System feels slow/unresponsive REPRODUCIBILITY : This bug can be reproduced always. CUSTOMER SUBMITTED WORKAROUND : Run jdk1.4.2 Release Regression From : 1.4.2 The above release value was the last known release where this bug was known to work. Since then there has been a regression. ###@###.### 2004-11-09 23:32:02 GMT
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