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https://issues.apache.org/jira/browse/LOG4J2-437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13806049#comment-13806049
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Remko Popma commented on LOG4J2-437:
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Also, in your system properties you have start heap size and max heap size = 2
GB. I don't know the characteristics of your application, but this does not
seem very much...
(EDIT) I just saw that you tried increasing start/max (?) heap size and this
solved the swapping problem. Good to hear that.
> Log4J2 Performs poorly with 500 concurrent users with Jboss 5.1.GA and JDK 6
> ----------------------------------------------------------------------------
>
> Key: LOG4J2-437
> URL: https://issues.apache.org/jira/browse/LOG4J2-437
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.0-beta9
> Environment: JDK : 1.6.0_18
> APP Server : Jboss 5.1.0_GA
> Task : Migrate from Log4J_1.2 to Log4J2
> OS : Linux 5 (Virtual Machine)
> Reporter: Giri Kosuru
> Priority: Critical
> Labels: Performance
>
> Environment Details
> ================
> JDK : 1.6.0_18
> APP Server : Jboss 5.1.0_GA
> Task : Migrate from Log4J_1.2 to Log4J2
> OS : Linux 5 (Virtual Machine)
> We are trying to upgrade from Log4J 1.2 to Log4J2 due to performance reasons.
> In log4j1.2, we saw thread BLOCKING and decided to go to LOG4J2. Before
> migration, we tested to evaluate and we found performance improvement with
> LOG4J2.
> After full migration, when application moved to performance testing
> environment, we started seeing trouble with Log4j2. We saw at least 40 TPS
> down, with increased response times; in performance. When diagnosed, found
> that there is increased SWAPPING on linux and with increased IO waits (Some
> times 15 %).
> For the same given environment and load test; application with LOG4J_1.2 code
> , does not have any SWAPPING and IO waits. In addition we have BAD
> performance with LOG4J2.
> Can anyone give us pointers on what we are doing wrong ? Or there are some
> performance issues with LOG4J2 ?? We are stuck in between releases and if
> there is no help coming, we may just abandon LOG4J2. So Please I request you
> to look seriously and give us some pointers.
> Following is the configuration for log4j2.
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <configuration status="trace" verbose="true">
> <appenders>
> <RollingRandomAccessFile name=“APP_1066_LOG"
> fileName=“/path/to/log/file-1066.log"
> filePattern=“/path/to/log/file-1066.log.%i" append="true"
> immediateFlush="false">
> <PatternLayout>
> <pattern>%d{ISO8601} %-5p [%t]: [%c{1}] %m%n
> - %X{ElapsedTime}-%X{ByteSize}-
> %X{uniqueID}-%X{HttpMethod}-%X{Host}-%X{URL}-%X{ClientIP}-%X{NodeID}-%X{NodeUserID}-%X{HttpCode}-%X{ApplicationCode}</pattern>
> </PatternLayout>
> <Policies>
> <SizeBasedTriggeringPolicy size="250 MB"/>
> </Policies>
> <DefaultRolloverStrategy max="10"/>
> </RollingRandomAccessFile>
> <RollingRandomAccessFile name="hibernateAppender"
> fileName=“/path/to/log/anotherfile-1066.log"
> filePattern=“/path/to/log/anotherfile-1066.log.%i" append="true"
> immediateFlush="false">
> <PatternLayout>
> <pattern>%d{ISO8601} %-5p [%t]: [%c{1}] %m%n
> - %X{ElapsedTime}-%X{ByteSize}-
> %X{uniqueID}-%X{HttpMethod}-%X{Host}-%X{URL}-%X{ClientIP}-%X{NodeID}-%X{NodeUserID}-%X{HttpCode}-%X{ApplicationCode}</pattern>
> </PatternLayout>
> <Policies>
> <SizeBasedTriggeringPolicy size="250 MB"/>
> </Policies>
> <DefaultRolloverStrategy max="10"/>
> </RollingRandomAccessFile>
> <Async name="ASYNC">
> <appender-ref ref="hibernateAppender"/>
> <appender-ref ref=“APP_1066_LOG"/>
> </Async>
> </appenders>
> <loggers>
> <root level="INFO">
> <appender-ref ref="ASYNC"/>
> </root>
> <!-- ============================== -->
> <!-- Various loggers -->
> <!-- ============================== -->
> <logger name="org.hibernate" additivity="false" level="INFO">
> <appender-ref ref="hibernateAppender" />
> </logger>
> <logger name="org.springframework.orm.hibernate3" additivity="false"
> level="INFO">
> <appender-ref ref="hibernateAppender" />
> </logger>
> <logger name="org.hibernate.SQL" level="INFO">
> <appender-ref ref="hibernateAppender" />
> </logger>
> </loggers>
> </configuration>
> {code}
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