On Tue, Aug 5, 2014 at 7:54 PM, Peter Rifel <pri...@mixpo.com> wrote:
> Hello, > > I am in the process of upgrading from Tomcat 7.0.54 to Tomcat 8.0.9 and am > seeing some performance degradation in my webapp. > > Configuration info: > > Ubuntu 14.04.1 LTS > java version "1.8.0_11" > Java(TM) SE Runtime Environment (build 1.8.0_11-b12) > Java HotSpot(TM) 64-Bit Server VM (build 25.11-b03, mixed mode) > > Both versions of tomcat use the APR Connector with TC Native 1.1.31 > statically linked against APR 1.5.1 and OpenSSL 1.0.1h > > > I'm running identical requests to identical web apps between these tomcats > and in Tomcat 8 I'm seeing an ~20% response time increase and as such a > similar reqs / sec decrease. After using VisualVM to profile the > application I've narrowed it down to the JRE's JAXP library taking > significantly longer to create its xml validation "SchemaFactory" which > doesn't make sense to me because I'm using the same JRE in both tests. I > know that the Resources implementation was overhauled in Tomcat 8 so is > there any possibility that this could be a side effect? For a better idea > of what I'm talking about, see the below VisualVM screenshots of a > profiling snapshot's call tree: > > > Tomcat 7 - http://i.imgur.com/pbX5xBG.jpg > Notice how the time spent in the javax.xml.validation.* methods is <6% > > Tomcat 8 - http://i.imgur.com/Txv20lg.jpg > Notice how the time spent in these methods is significantly higher. > > > Again, I'm confused as to how the performance of the JRE's library changes > between tomcat versions, can anyone explain this to me or point me in the > right direction on where to look? Is it as simple as a config change or > will it require a java code change? The XmlUtils.validate method you see > in the screenshot is simply the following: > > javax.xml.validation.SchemaFactory factory = > SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema";); > > Here are the Tomcat configurations: > > > Tomcat 8 server.xml: http://pastebin.com/Tn3d6bXd > Tomcat 8 context.xml: http://pastebin.com/reuJCGNq > > Tomcat 7 server.xml: http://pastebin.com/Kq6SfFd0 > Tomcat 7 context.xml: http://pastebin.com/vdp0PGPh > > > Does anyone have any idea why this might be performing so differently > between versions of tomcat? Could it be a bug in the JRE? I can try and > provide test code for repro if it helps. > Are you using the "endorsed" directory with Tomcat 7 (and not with 8) by any chance? http://tomcat.apache.org/tomcat-7.0-doc/class-loader-howto.html#XML_Parsers_and_Java Dan > > Thanks in advance, > > Peter Rifel > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
