high cpu load (50% cpu on dual core) with only one active connection
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Key: DIRMINA-442
URL: https://issues.apache.org/jira/browse/DIRMINA-442
Project: MINA
Issue Type: Bug
Components: Core
Affects Versions: 2.0.0-M1
Environment: 1) Fresh mina built from trunk (revision 577654)
2) Windows XP SP2 (reproduced also on Win2k server)
3) java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b06)
Java HotSpot(TM) Client VM (build 1.6.0_02-b06, mixed mode, sharing)
Reporter: Dmitry V. Zemnitskiy
Priority: Critical
Attachments: echo.hprof
I've noticed that even single connection causes mina server to enter tight loop
in
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0
This leads to immediately increase CPU load to 50% of my dual core cpu (Intel
core duo)
on win2k with 1cpu process consumes even more (70%-80% CPU)
Reproduction is very simple:
1) checkout mina from trunk and build it using maven
2) run echo server:
java -agentlib:hprof=cpu=samples,file=echo.hprof -classpath
mina-core-2.0.0-M1-SNAPSHOT.jar;mina-example-2.0.0-M1-SNAPSHOT.jar;slf4j-api-1.4.3.jar;slf4j-log4j12-1.4.3.jar;log4j-1.2.14.jar
org.apache.mina.example.echoserver.Main
3) telnet localhost 8080
4) type one character in telnet window
5) CPU load immediately increased to 50%
I'll attach hprof dump to this issue
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