September 2009 - jboss-dev-forums

[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by adrian＠jboss.org

"jason.greene(a)jboss.com" wrote : and it can do direct method invocation as opposed to reflection which is definitely faster. I think you'll find that that is probably not as relevant as you think. This is a similar problem to Serialization. The time it takes to 1) decide what to do - typically a string comparison on an element or attribute name 2) coerce xml data into non-string types will likely "swamp" the small amount of extra time it takes to invoke a setter via reflection, most of which is the construction of an Object array to pass to Method.invoke(). That's not to say the difference is unimportant. If you have to parse lots of xml, it will definitely add up over time. e.g. See my 0.4 seconds from 2.4 seconds estimate above (which is probably not all reflection overhead anyway?) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257942#4257942 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257942

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by alex.loubyansky＠jboss.com

BTW, there is no XSD at all in this test. So validation is not done. Yes, I understand the impl based on generated parsers may not be the most optimal possible. This is not meant to criticize the idea in general. I am puzzled by the results myself. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257941#4257941 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257941

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by jason.greene＠jboss.com

"alex.loubyansky(a)jboss.com" wrote : Fast jaxb doesn't parse schema itself. It maybe the SAX parser behind the scene. But the same SAXParserFactory is used by XB. All the initialization is in the test. XB does enable validation and schema awareness. There must be something else. Yes this is what I was referring to. Making sure they have identical sax parsers and configuration. One issue I just noticed is that the generated parser does a if/else switch style tree with equalsIgnoreCase(). JBossXB uses maps internally, so this could be one area of difference. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257939#4257939 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257939

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by bill.burke＠jboss.com

Also, I think you should do some timing against XJC generated code. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257937#4257937 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257937

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by bill.burke＠jboss.com

All I know is that a code generation approach reduces bind time to zero as the only overhead is loading the parser classes. I am not an XML parsing expert. I just used the Sax parser that comes with the JDK. Also, the algorithm I used may not be optimal as fast-jaxb was the first time I ever wrote a sax parser. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257936#4257936 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257936

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by alex.loubyansky＠jboss.com

Fast jaxb doesn't parse schema itself. It maybe the SAX parser behind the scene. But the same SAXParserFactory is used by XB. All the initialization is in the test. XB does enable validation and schema awareness. There must be something else. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257931#4257931 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257931

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by jason.greene＠jboss.com

Another thing to check, is to make sure they are using the same parser. JBossxb could be bringing in a better version of xerces, while the fast-jaxb generated parser is using the jdk version. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257927#4257927 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257927

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by jason.greene＠jboss.com

"alex.loubyansky(a)jboss.com" wrote : "adrian(a)jboss.org" wrote : anonymous wrote : | | | jaxb parsers had been generated and compiled before the test run. | | | | Ok, so what is fast jaxb doing that it is 3 times slower on the first iteration | | (even though you have already pre-generated classes)? | | Is it parsing the xml schema or something? Are you comparing apples to apples? | | I actually can't comment at the moment of what the bottleneck is. Maybe I'm missing something, but it looks to me like apples to apples. | At least that's how a simple parsing client is supposed to use the API. Perhaps it's something like Adrian suggests where the fast-jaxb classes are using schema validation. It just doesn't make sense that a pregenerated parser would be slower than a dynaimc reflection based model. The pregenerated version has less work to actually do, and it can do direct method invocation as opposed to reflection which is definitely faster. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257926#4257926 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257926

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by alex.loubyansky＠jboss.com

"adrian(a)jboss.org" wrote : | "adrian" wrote : If the code generation was moved to compile time (like xjc), then having | | already generated classes will obviously out perform the reflection used by JBossXBBuilder. | Fast jaxb parsers had been generated and compiled before the test run. Ok, so what is fast jaxb doing that it is 3 times slower on the first iteration (even though you have already pre-generated classes)? Is it parsing the xml schema or something? Are you comparing apples to apples? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257914#4257914 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257914

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[JBoss XML Binding Development] - Re: XB profiling during the AS start-up

by alex.loubyansky＠jboss.com

"adrian(a)jboss.org" wrote : "alex.loubyansky(a)jboss.com" wrote : "adrian" wrote : fast jaxb is clearly faster at the binding | | But binding was out of the scope of the test. | | | | I don't understand that? Surely the unmarshaller.parse() will bind the xml to the | objects in both tests? Ah, we meant different things. By binding I meant building the SchemaBinding and other pre-parsing steps. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257911#4257911 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4257911

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jboss-dev-forums September 2009