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.po...@gmail.com> wrote: > Can you post your log4j2 configuration? > > Sent from my iPhone > > > On 2015/10/10, at 21:58, Strong Su <lovelo...@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.po...@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 <lovelo...@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 > >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: log4j-user-unsubscr...@logging.apache.org > For additional commands, e-mail: log4j-user-h...@logging.apache.org > >