On 07/06/17 22:28, Mark Thomas wrote: <snip/>
> I'm still seeing significant differences in BIO with and without an > executor. > > I'm still looking for the root cause. I have noticed that without an > executor I see far fewer keep-alive requests than I'd expect. That could > explain the difference, or some of it at least. Further testing indicates that most, if not all, of the performance difference is down to the fewer number of requests processed using HTTP keep-alive. This is because BIO without an executor is subject to disableKeepAlivePercentage whereas BIO with an executor is not. If the number of concurrent clients is kept below 75% of maxThreads, performance remains very similar. The problems you are likely to experience in the real world without disableKeepAlivePercentage (i.e. if you use BIO with an executor) are described in this thread: http://tomcat.markmail.org/thread/mcfdk2273v2fsh5k The better tuning options are probably: - increase maxThreads to max expected client concurrency + headroom or if your memory/CPU won't permit that, as high as you can - increase disableKeepAlivePercentage I'll look at BIO vs NIO next. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
