Jaikit, Thats exactly what I was seeing, also with Java7.
Let me do some testing though, because just because you see contention in profiler, doesn't mean that there is also a significant impact. I'll report back when I've done this. Dan On Mon, May 12, 2014 at 10:10 PM, Jaikit Savla <jaikit.sa...@yahoo.com> wrote: > I have seen similar issues sometimes - while running with 512 concurrent > connections using HttpClient 4.3 (Noticed all threads stuck in > java.lang.reflect.Proxy.getProxyClass0 in jstack log). I found some > discussion online regarding improving the performance in latest jre but have > not tried running my application with jdk8 yet. > > http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-April/subject.html#15854 > > Jaikit > > On Monday, May 12, 2014 11:17 AM, Oleg Kalnichevski <ol...@apache.org> wrote: > > On Mon, 2014-05-12 at 13:21 +0100, Daniel Feist wrote: >> >> 2) Can I expect 4.2 to scale better? >> > >> > I do not think so. In my tests HC 4.3 performs better than 4.2. There >> > have also been reports >> >> Even with high concurrency of say 200 and high TPS, for example in a >> http proxy scenario? >> > > Yes, also with over 200 concurrent connections. However, for HTTP proxy > scenarios one may be advised to consider using a non-blocking model. > >> >> 3) Is there a way of configuring 4.3.3 to not use proxys? >> > >> > No, there is not. The cost of dynamic proxies in modern JREs is believed >> > to be low. >> >> The problem I see isn't the use of proxies, it is in the creation of >> these proxy instances which is synchnorized on a HashMap 'cache' in >> two places in java.lang.reflect.Proxy.getProxyClass0(ClassLoader, >> Class<?>...). This is visible in the profiler screenshot I shared >> too. >> >> This probably isn't an issue with low concurrency, or high concurrency >> and low TPS, but in my testing/profiling it comes up as an issue. >> > > I use this micro-benchmark to benchmark HttpClient performance between > versions as well compared to other implementations. > > http://wiki.apache.org/HttpComponents/HttpClient3vsHttpClient4vsHttpCore > > I am open to the idea of replacing dynamic proxies with hand crafted > classes, but I would like to see more evidence that > java.lang.reflect.Proxy is indeed a bottleneck. > > Oleg > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org > For additional commands, e-mail: httpclient-users-h...@hc.apache.org > > --------------------------------------------------------------------- > To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org > For additional commands, e-mail: httpclient-users-h...@hc.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org For additional commands, e-mail: httpclient-users-h...@hc.apache.org
