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From Strong Su <lovelo...@gmail.com>
Subject Re: Bizarre performance in log4j2
Date Sun, 11 Oct 2015 10:21:55 GMT
My log4j2 sync configuration is:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
    <Appenders>
        <!-- Async Loggers will auto-flush in batches, so switch off
immediateFlush. -->
        <File name="File" fileName="{PATH}/a.log"
immediateFlush="false" append="false">
            <PatternLayout pattern="%d %-5p [%c{2}] %m%n"/>
        </File>
        <Console name="STDOUT" target="SYSTEM_OUT">
            <PatternLayout pattern="%d %-5p [%c{2}] %m%n"/>
        </Console>
    </Appenders>

    <Loggers>
        <Root level="info" includeLocation="true">
            <AppenderRef ref="File"/>
            <AppenderRef ref="STDOUT"/>
        </Root>
    </Loggers>

</Configuration>

And async configuration change <Root> to <AsyncRoot>

On Sun, Oct 11, 2015 at 10:51 AM, Remko Popma <remko.popma@gmail.com> wrote:

> Can you post your log4j2 configuration?
>
> Sent from my iPhone
>
> > On 2015/10/10, at 21:58, Strong Su <lovelosew@gmail.com> wrote:
> >
> > I insert a log in a http request function on server side. And I start
> > requests continually on client side through hundreds of threads.
> > I measure the performance through QPS because server has to print a log
> > whenever it receive a request. The time delayed by logging will influence
> > QPS heavily.
> > When I didn't insert a log in the request function, QPS was about 20000.
> > When I inserted a log4j1 log, QPS was about 10000.
> > When I inserted a log4j2 sync log, QPS was about 18000.
> > But when I inserted a log4j2 asycn log, QPS was only about 5000.
> >
> >> On Sat, Oct 10, 2015 at 8:34 PM, Remko Popma <remko.popma@gmail.com>
> wrote:
> >>
> >> How did you measure the good performance (with sync logging) and the bad
> >> performance (with async)? What happens exactly when "it turns terrible"?
> >>
> >>> On Saturday, 10 October 2015, Strong Su <lovelosew@gmail.com> wrote:
> >>>
> >>> Hello everyone,
> >>> I'm still testing log4j2 on our projects.
> >>> When using it, I find it has a beautiful performance when using sync
> >>> log4j2.
> >>> But it turns terrible when I add -DLog4jContextSelector or change
> <root>
> >> to
> >>> <AsyncRoot> in log4j2.xml to use async log4j2.
> >>> I don't even have a clue on explaining this.What could cause this
> bizarre
> >>> problem?
> >>>
> >>> Thank you.
> >>> Best regards,
> >>> Dylan Su
> >>
>
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