log4j GC免费性能

我们从v2.5迁移到log4j v 2.6.1（不含GC） . 我想测量一下如何改进我们的应用程序（非基于Web） .

我们在配置中所做的更改：

• 尽可能使用asyncloggers . 唯一使用的异步appender是SMTP .

• 仅使用支持的模式（％d {dd MMM yyyy HH：mm：ss，SSS}） .

• 未将log4j2.is.webapp显式设置为false，因为我们没有servlet类，这意味着启用了无垃圾日志记录 .

为了比较性能，我们记录GC输出 - 新版本有时需要更多时间每个GC（次要） . 它确实按预期分配了一些内存 . 分析确实显示已分配固定内存 .

例如 . 2016-06-28T04：39：49.015 0100：1078.995：[GC（分配失败）[PSYoungGen：5603306K-> 91449K（6422528K）] 5603489K-> 91640K（7471104K）， 0.0332092 秒] [时间：用户= 0.21 sys = 0.00 ，真实= 0.03秒]

任何想法，如果我会缺少一些配置或其他方法来衡量这个？

Java版本：JRE 1.8u40 64位

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="info" name="foo" packages="">
    <Appenders>
        <!--old appenders-->
        <!--<Async name="AsynchronousConsoleAppender" blocking="false" bufferSize="20000">-->
            <!--<AppenderRef ref="ConsoleAppender"/>-->
        <!--</Async>-->
        <!--<Async name="AsynchronousFoo1Appender" blocking="false" bufferSize="20000">-->
            <!--<AppenderRef ref="Foo1RollingFileAppender"/>-->
        <!--</Async>-->
        <!--<Async name="AsynchronousFoo2Appender" blocking="false" bufferSize="20000">-->
            <!--<AppenderRef ref="Foo2RollingFileAppender"/>-->
        <!--</Async>-->
        <!--<Async name="AsynchronousFoo3Appender" blocking="false" bufferSize="20000">-->
            <!--<AppenderRef ref="Foo3RollingFileAppender"/>-->
        <!--</Async>-->

        <Async name="AsynchronousSMTPAppender" blocking="false">
            <Filters>
                <RegexFilter regex=".*Reason: Refused invalid message \(Missing fo\):.*" onMatch="DENY"
                             onMismatch="NEUTRAL"/>
                <RegexFilter regex=".*log4j lib is not in the classpath java\.lang\.NoClassDefFoundError.*"
                             onMatch="DENY"
                             onMismatch="NEUTRAL"/>
                <ThresholdFilter level="${sys:smtpThreshold}" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
            <AppenderRef ref="smtpAppender"/>
        </Async>

        <Console name="ConsoleAppender">
            <PatternLayout>
                <pattern>%d{dd MMM yyyy HH:mm:ss.SSS} [L2] &lt;%t&gt; [%-5p] [%c{1}] %m%n</pattern>
            </PatternLayout>
        </Console>

        <RollingFile name="Foo1RollingFileAppender" fileName="${sys:log.log-name}.log"
                     filePattern="${sys:log.log-name}-%d{yyyy-MM-dd}.log" append="true">
            <PatternLayout>
                <pattern>%d{dd MMM yyyy HH:mm:ss.SSS} [L2] %m%n</pattern>
            </PatternLayout>
            <Policies>
                <TimeBasedTriggeringPolicy modulate="true"/>
            </Policies>
        </RollingFile>

        <RollingFile name="Foo2RollingFileAppender" fileName="${sys:log.log-name}.log"
                     filePattern="${sys:log.log-name}-%d{yyyy-MM-dd}.log" append="true">
            <ThresholdFilter level="INFO" onMatch="ACCEPT"/>
            <PatternLayout>
                <pattern>%d{dd MMM yyyy HH:mm:ss.SSS} [L2] %m%n</pattern>
            </PatternLayout>
            <Policies>
                <TimeBasedTriggeringPolicy modulate="true"/>
            </Policies>
        </RollingFile>

        <RollingFile name="Foo3RollingFileAppender" fileName="${sys:log.log-name}.log"
                     filePattern="${sys:log.log-name}-%d{yyyy-MM-dd}.log" append="true">
            <ThresholdFilter level="INFO" onMatch="ACCEPT"/>
            <PatternLayout>
                <pattern>%d{dd MMM yyyy HH:mm:ss.SSS} [L2] %m%n</pattern>
            </PatternLayout>
            <Policies>
                <TimeBasedTriggeringPolicy modulate="true"/>
            </Policies>
        </RollingFile>

        <!-- the buffer size needs to be bigger than the backlog.-->
        <ThrottlingSMTP name="smtpAppender" to="${sys:technicalIssueRecipients}"
                        from="test-${sys:mode}@xxx.com"
                        subject="test [${sys:instance.name}] Errors"
                        smtpHost="${sys:smtp.host}"
                        throttleTokens="3" throttleTokenRespawnMs="20000" throttleRestTimeMs="5000"
                        throttleMaxBacklogSize="100" ignoreExceptions="true">
            <HtmlLayoutWithTimesInUTC contentType="text/html"/>
        </ThrottlingSMTP>

    </Appenders>

    <Loggers>
        <!-- ============================== -->
        <!-- Noisy Loggers                  -->
        <!-- ============================== -->

        <AsyncLogger name="com.package1" level="fatal"/>
        <AsyncLogger name="com.package2" level="warn"/>

        <AsyncLogger name="com.package3" level="error"/>
        <AsyncLogger name="com.package4" level="error"/>
        <AsyncLogger name="com.package5" level="error"/>
        <AsyncLogger name="com.package6" level="error"/>

        <AsyncLogger name="com.package7" level="warn"/>
        <AsyncLogger name="com.package8" level="warn"/>
        <AsyncLogger name="com.package9" level="warn"/>
        <AsyncLogger name="com.package10" level="warn"/>
        <AsyncLogger name="com.package11" level="warn"/>
        <AsyncLogger name="com.package12" level="warn"/>
        <AsyncLogger name="com.package13" level="warn" />

        <AsyncLogger name="com.package14" level="warn"/>
        <AsyncLogger name="com.package15" level="warn"/>
        <AsyncLogger name="com.package16" level="warn"/>
        <AsyncLogger name="com.package17" level="warn"/>
        <AsyncLogger name="com.package18" level="warn"/>
        <AsyncLogger name="com.package19" level="warn"/>
        <AsyncLogger name="com.package20" level="warn"/>
        <AsyncLogger name="com.package21" level="warn"/>
        <AsyncLogger name="com.package22" level="warn"/>

        <AsyncLogger name="org.springframework" level="warn"/>
        <AsyncLogger name="com.package23" level="error"/>

        <AsyncLogger name="com.package24" level="warn"/>
        <AsyncLogger name="com.package25" level="warn"/>\
        <AsyncLogger name="com.package26" level="warn"/>
        <AsyncLogger name="com.package27" level="warn"/>

        <!-- ============================== -->
        <!-- DEBUG Loggers                  -->
        <!-- ============================== -->

        <AsyncLogger name="com.package28" level="debug"/>
        <AsyncLogger name="com.package29" level="debug"/>

        <!-- ============================== -->
        <!-- Different File loggers         -->
        <!-- ============================== -->

        <AsyncLogger name="EVENT_NOTIFICATION" additivity="false" level="${sys:event.logger.threshold}">
            <AppenderRef ref="ConsoleAppender"/>
        </AsyncLogger>


        <AsyncLogger name="FOO2_LOG" additivity="false">
            <AppenderRef ref="Foo2RollingFileAppender"/>
        </AsyncLogger>


        <AsyncLogger name="FOO3_LOG" additivity="false">
            <AppenderRef ref="Foo3RollingFileAppender"/>
        </AsyncLogger>

        <AsyncLogger name="FOO1_LOG" additivity="false">
            <appender-ref ref="Foo1FileAppender"/>
        </AsyncLogger>

        <Root level="info">
            <AppenderRef ref="ConsoleAppender"/>
            <AppenderRef ref="AsynchronousSMTPAppender"/>
        </Root>
    </Loggers>
</Configuration>