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From Strong Su <lovelo...@gmail.com>
Subject Re: Bizarre performance in log4j2
Date Sat, 10 Oct 2015 12:58:01 GMT
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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