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I know it’s gonna hurt. It’s gonna hurt because I’ll publish some micro benchmarks. And as far as i remember most of the guys publishing any benchmarks of this type regretted it later on. Having said that. I’ll nevertheless do it. Don’t take it too serious as it’s just for fun and was a result of my dispute with my friend Artur about the current state of performance (and overhead) of Java collections. Since we’re on a. NET class this week (just to know what’s enemy thinking) i had too many spare time when the teacher was explaining us what’s an URI is (a customized class would be too expensive so we had to attend a run of the mill typical “Introduction to the. NET platform” training). I’ve remembered that i’ve read somewhere that in the era of HotSpot the performance benefits of using Array (i’m using the term Array to name the [] type array not the collection type) vs ArrayList are very little and there seems to be small amount of use cases that actually justify usage of the array instead of collection. The common sense was that you’re trading flexibility for performance here. So i’ve decided to compare the read/write operations speed on a fixed side Array and ArrayList to verify this assumption. As you can see it’s really strightforward. I’m generating array populate it with ints and i create ArrayList and populate it with Strings. The array operates on 32 bit primitive type because we also thought it might be the fastest options. On the other hand the ArrayList also holds just references to String objects which are 32bit pointers (before you ask: i’ve tried to fill the array with Strings too and it did not changed the figures i was getting). Using the Visual Studio that we’ve got in the class i wrote the equivalent in c#: Now for the results. I’ll present the results of the 6th iteration. It’s enough for the HotSpot to kick in and do all the optimizations (I’ve checked with all compilation happens on first 2 iterations. There is one more later on but it does not change the results). All the tests were run on a “no name” intel Windows box with 4 gigs of RAM and a decent CPU. The timings are in milliseconds. jdk1.6.0_03 ( -XX:+AggressiveOpts -Xmx512m)Collection loop: 5984Array primitive loop: 547 jdk1.6.0_03 ( -XX:+AggressiveOpts -Xx512m -server)Collection loop: 2313Array primitive loop: 484 jdk1.5.0_13 (-Xmx512m -XX:+PrintCompilation -server)Collection loop: 2063Array primitive loop: 453 jrockit-R27.4.0-jre1.6.0_02 (-Xmx512m)Collection loop: 2500Array primitive loop: 469 jrockit-R27.4.0-jre1.6.0_02 (-Xmx512m -XXcallProfiling) Collection loop: 906 Array primitive loop: 469 The results for Java have some surprises as you can see: There is huge difference between server and client versions of Sun’s Java 6. Debugging shows that the HotSpot is JITing the benchWrite method but there is not visible speed difference after. in BEA’s JRockit there was no visible difference between client and server version. there is a special optimization in JRockit that you can turn on with -XXcallProfiling that gives a dramatic speed increase. By looking at the results above you can see that there not so much of a difference in speed between the. NET framework release. There is a small improvement in the list loop and slight degradation in the array loop. But we’re talking about 2-3% differences here. I was a little surprised no to find any reference to a command line optimization switches for the CLR runtime. If somebody knows where can i find a list of them please make a comment. After running these benchmarks (and some more variations of them) i came to the following conclusions: Array operations are between 4 to 2 times faster than the equivalent collection operations in Java. Array operations have comparable performance in Java and in. NET while Java collections are noticeably faster. the callProfiling optimization in JRockit made a lot of difference. It would be interesting to see it in action on a non trivial example. We’ve also made some benchmarks where the code in the inner loop did something more with the objects in the array/list (like concatenating the string with some other string). When there was some object creation etc and not just copying then the speed difference between array and collection dropped to 10-20%. So the final conclusion is that these days you can safely default to using ArrayList in Java and only fall back to array when you’re really sure you need that extra bit of performance and not stick to array and move to ArrayList when you need flexibility.

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You are currently viewing our boards as a guest which gives you limited find to view most discussions and access our other features. By joining our free community you ordain: have the possibility to earn one of our surprises if you are an active member access many other special features that ordain be introduced later. Registration is fast simple and absolutely remove so please. ! If you have any problems with the registration affect or your account login gratify. ckkl-core is a collection of Java classes developed for personal projects and research. Its implemented features include but are not limited to Java type handling with aliases and equality testing easy discovery and accessors for JavaBeans properties functional-oriented collections (list with map() filter() and others) and an API to support an easy toString() implementation change surface for the most complex cases. ChangesThe documentation was clarified. URL:

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Thinking in Java is a printed version of Bruce Eckel’s online materials that provides a useful perspective on mastering Java for those with previous programming experience. The compose’s take on the essence of Java as a new programming language and the thorough introduction to Java’s features alter this a worthwhile tutorial. Thinking in Java begins a little esoterically with the compose’s reflections on why Java is new and better. (This book’s choice of font for chapter headings is remarkably hard on the eyes.) The author outlines his thoughts on why Java ordain make you a exceed programmer without all the complexity. The schedule is better when he presents actual language features. There’s a tutorial to basic Java types keywords and operators. The guide includes extensive source label that is sometimes daunting (as with the author’s sample code for all the Java operators in one listing.) As such this text will be most useful for the experienced developer. The text then moves on to class design issues when to use inheritance and composition and related topics of information hiding and polymorphism. (The treatment of inner classes and scoping will likely seem a bit overdone for most readers.) The chapter on Java collection classes for both Java Developer’s Kit (JDK) 1.1 and the new classes such as sets lists and maps are much better. There’s material in this chapter that you are unlikely to find anywhere else. Chapters on exception handling and programming with type information are also worthwhile as are the chapters on the new Swing interface classes and network programming. Although it adopts somewhat of a mixed-bag come. Thinking in Java contains some excellent material for the object-oriented developer who wants to see what all the fuss is about with Java. Posted on Friday. November 16th. 2007 at 8:44 amand belongs to. . You can follow any responses to this entry through the feed. You can or from your own site. part -1http://mihd net/t1gwkx part-2 No password friends Enjoy act Posting new Stuff Knowledge is sharable overlap It Would you like to exchange cerebrate with KnowFree? Please your description and button and link to us by the button below. Thank you.

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Hi All,I am hoping someone can explain to me the difference in terms of GC between the two approaches below. In both cases a new disapprove is being created in each iteration of the circle. Are there any efficiencies provided to the GC by us re-using the same reference for different objects? joebassil wrote:I am hoping someone can explain to me the difference in terms of GC between the two approaches below. In the first inspect the very last go out you create is still referenced after the loop completes. However since this is a local variable that won't last desire anyway. So no real noticeable difference In both cases a new Object is being created in each iteration of the loop. Are there any efficiencies provided to the GC by us re-using the same reference for different objects? The second case is better because the variable's scope matches its use irrespective of any GC issues. Either way the VM will allocate one reference variable spot for that variable on the stack at method entry. All variables in a method are allocated slots in the stack frame from the beginning and become unreachable as the method returns. Where variables are defined in inner blocks they comfort exist for the duration of the method call they are simply hidden outside of the block. Consequently there's no difference in the code produced.. Declaring variables in inner blocks is fine but it contributes mostly to the avoidance of name space polution it makes no difference to the code. Yeah. I was smoking kiz feed when I wrote: In the first case the very last date you create is still referenced after the loop completes. That's just crazy talk.

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Java generics. Much talked about these days. So lets act a be at what generics means. Anyone who has use java has come across the java Collections Framework. Very convenient fun to use pass around manipulate play with and all that. object for one little detail So far you could add objects of any write into a collection. For example: Generics provides a way for you to communicate the type of a collection to the compiler so that it can be checked. Once the compiler knows the element type of the collection the compiler can analyse that you undergo used the collection consistently and can attach the change by reversal casts on values being taken out of the collection. The compiler can now affirm at hive away time that the write constraints are not violated at run measure thereby guaranteeing more robustness. The main difference in the two methodologies is that while in the first case the label and the compiler tell us what the developer “thinks” is true at a given inform of execution in the label(which the VM checks only at run-time) versus what a compiler “knows” and has “verified” to be true at the same given inform in time. While the primary use of generics is collections there are many other uses. “Holder classes,” such as WeakReference and ThreadLocal have all been generified that is they have been retrofitted to make use of generics. More surprisingly categorise Class has been generified. categorise literals now answer as write tokens providing both run-time and compile-time type information. types). Doing so would however imply that parameter write information is not available at run measure meaning the new automatically generated casts may disappoint when interoperating with ill-behaved legacy code(One is type-checked the other is not create by mental act what happens when the types dont match up?). There is however a way to achieve guaranteed run-time write safety for generic collections change surface when interoperating with ill-behaved legacy code. at the inform where the legacy label attempts to attach the integer. The resulting stack trace ordain accept you to analyse and repair the problem. Meaning we undergo now implemented write checking at the point-of-entry for previously unchecked code! XHTML: You can use these tags: <a href="" call=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <have in mind> <label> <del datetime=""> <em> <i> <q cite=""> <touch> <strong>

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