-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Peter,
On 8/5/14, 7:54 PM, Peter Rifel wrote: > 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. To me, this suggests other factors that haven't been controlled, like GC activity or something else. Are you sure you have a good steady-state test? Any chance you could create a single SchemaFactory object and then synchronize access to it? It might reduce contention. Another possibility is to use a ThreadLocal (which has its own dangers). > 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. Does the "validation" time include loading the schema itself from wherever it is located? > 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. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJT4hZQAAoJEBzwKT+lPKRYJjkP/AzqWNqqEUask7/uF+tuQX13 jWhEVww7b7pMQjyoVqvMA1J4VoUTLBM1je6wJpBaIVndq8MIBu6vuO6rpZl3UH6N /SpljKB4HdovwUIUAPtJKTV5bQExGGIgWUENYS6fA1YPOnI9hS5rShrs/YxMnjnW csrR+UVW20TwucHvpsqoEPVFszD5j8WIg08tebKSEscAWqoKpShEpNAuSefh4AKZ R3md0Zmd0Qevpn/zzusFKaVqb6LmCwLUfTbtmpCX/irK3wj800GXQT2WECrW3il8 mL9142A8FhtqsCKSh+A3mQukfaf5SZqJ5JPyKGAFNhceA4fgd3Sdb4pCKvb7uoav NJda7luZaqRUcgm4CX6rNCVwf6aWccu3oO7L+tG7G8OHi6KptrZ6VOdrBb9peXvB 9pFddcxxBc1Th5mANGLFCC7JKc4Sq1VeG8CEIWPcl0JB/bKT2jODabcy6GQ9jpp6 HmTX8gRoc5sDpcPxq/vr+dcW7dSyAK9RYp7hYzUJaO13o5pCINcjzYdVBECLCKoU Fyga1Re9v02CfL0aAUXAWgOWW7RNBm2ehBX1yqHq4Di/y5I84tJQxqcX9Amhss/R HCfcT1FTIs671zYZOh/w3JTmkQC4BgPEEev9WM1XTel9y77x/QmDwpPzEvZT2fgS 4lvTEwCzxmgC4HjFVrxh =A0ue -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
