Απ: .NET Platform vs Sun Java VM version 2

Παναγιώτης Καναβός — Sun, 19 Mar 2006 23:08:39 GMT

Βρε παιδιά δεν βαριέστε αυτή την κουβέντα? Δε λέω, έχει και παραέχει νόημα, αλλά με μαθηματική ακρίβεια προσελκύει "Ταλεμπάν". Πριν από αρκετό καιρό είχαμε εδώ ένα mini-flame όταν κάποιος ο οποίος δεν είχε ξανακούσει για templates και generics προσπάθησε να αποδείξει ότι τα Java Generics είναι καλύτερα από του .Net. Και όχι, δεν ήξερε τί είναι τα templates, πού χρησιμοποιούνται τα generics και τί κάνουν.

Πέρα από αυτό, το συγκεκριμένο άρθρο είναι από τα λίγα που διαχωρίζει τις γλώσσες από το VM και τις βιβλιοθήκες (JDK και .Net Framework). Αν δεν γίνει αυτός ο διαχωρισμός, κάθε σύγκριση είναι αποτυχημένη, σαν να συγκρίνει κανείς όχι μήλα με πορτοκάλια, αλλά καταΐφια με φορολογικές δηλώσεις. Ευτυχώς που δεν έχει μπλέξει κανείς και τα IDE στην κουβέντα.

Απ: .NET Platform vs Sun Java VM version 2

thrylos — Sun, 19 Mar 2006 22:16:25 GMT

Το source που δίνεις είναι πολύ παλιό και πολλά στοιχεία που αναφέρει δεν είναι αληθή πια.

Όπως τ' ότι πρέπει να βασίζεσαι στη Sun για compiler. Η IBM έχει βγάλει δικό της compiler και JVM η οποία είναι καλύτερη και γρηγορότερη. Χρησιμοποιεί καλύτερο garbage collector και επειδή είναι γραμμένη σε C++ έχει καλύτερη επίδοση.

.NET Platform vs Sun Java VM version 2

zazikis — Sun, 19 Mar 2006 20:43:52 GMT

NET Platform vs Sun Java VM
The main debate should be between the .NET Platform and the Sun Java VM (virtual machine). All languages on the .NET gain their powers from the .NET Platform.
If you stay in touch with the news then you would know that it was Microsoft who had made the fastest Java VM. They could achieve it by tweaking the VM to give a better performance over Intel platforms. Although due to the legal problems this project along with the VJ++ project has been discontinued. Just to tell you how serious Microsoft is about the .NET Platform, they have spent 4 billion dollars and more in the research and development of .NET and have pledged to devote 80% of their R&D in the year 2001-02 on the .NET Platform. We have already see how Microsoft has ambitiously taken over the market in the past when Windows gained popularity over Macintosh (which people still think is a superior OS). Also the Netscape and IE war was won by Microsoft despite Microsoft's late entry into the browser market.
When such a ambitious company is spending so much resources it sure has to have a strong strategy and product! Some points of distinction are explained below.

1) Platform Independence
I have taken this point first because this is the most ravaged point I have seen crusaders of Sun Java shouting about. I would like to highlight some facts here. Even though Microsoft has not made any open announcements nor are they publicizing Platform Independence, but the fact is .NET Platform Independent. Microsoft is not making any announcements because they don't want to jump around before they have a solid product in their hand. But Microsoft has already announced that they are going to release .NET Platform for Linux! And Microsoft's commitment can also be seen in their acquiring a significant stake in Corel Linux. Slowly there will be a .NET Platform for every OS.
(Update 10/May/2002: MONO Project www.go-mono.com is already developing the CLR and C# compiler for Linux. Microsoft has released ROTOR the shared source containing the .NET Platform which works on Free BSD.)
One more added advantage of .NET Platform is Language Independence. Since all the code on the .NET ultimately gets converted to IL, you can use components written in one language in another language without writing any extra code!
Also people who have tried to migrate big Java projects from one operating system to another, will realize that its simply does not work!! There is some amount of re-coding required to port the application from one platform to another.
A example of this is that the Framework classes (System Namespaces) that come with the .NET SDK have been written in C#, but you can use these classes from any language like VB.NET, Managed C++ without ever writing any extra code!

2) Performance and Speed
As I mention before that it was Microsoft that had developed the fastest Java VM which reports say is 5x faster than the Sun VM. They have learned a lot from their previous ventures. The Sun Java VM does not perform any CPU specific optimizations. Although I have heard about the new HotSpot VM from Sun, but its just a code caching mechanism. Microsoft on the other hand is perusing much ahead in the CPU specific optimizations. Be sure these optimizations are made to the JITer and has not effect on the code you compile and this does not make your code Platform Dependent. What these optimizations do? Say Microsoft finds that a particular instruction performed on a Intel P-III gives a higher performance and the same instruction should be performed in a different way on a AMD Durathon, it tweaks the JIT'er for the specific CPU so that it optimizes the performance of your applications according to your CPU. Such optimizations helps you to utilize the true power of the CPU.
If you go the Java way, a Java program would more or less perform the same on a Intel 1hz or a AMD 1hz without taking into consideration the special features of the CPU. The .NET Platform will provide different JIT'ers for the Intel as well as AMD CPU's so that it can utilize all the special instruction sets which the 2 CPU's have allowing you to realize the value of the money you have invested in buying a specific processor.
Since .NET is in its Beta version there have not been any specific performance charts, but be assured the .NET will out perform its counterpart in its future releases.
(Update 10/May/2002 : See www.gotdotnet.com/petshop for performance benchmarks.)

3) Open competition for language and tool developers.
The .NET platform is sort of a open platform, any vendor can create a compiler for it! All languages can be ported to .NET, may be some day someone might even write a Java compiler for the .NET. As of the Java scene, you have to rely on the arrogance of Sun to provide you with compilers. This limits the chance of open competition between third-party developers.
Just like on the native platform, we have compilers for C/ C++ from many vendors like Microsoft, Borland etc. The choice of choosing the compiler rests in the hands of the developer. The .NET Platform too invites vendors to develop their own compilers. I just can't resist mentioning that C# and the CLI (Common Language Interface) has been submitted to the ECMA committee and even you can write a C# compiler!
Since third party vendors can create compilers, it goes without saying that they are also free to develop third-party tools, so now the developer will get a better choice of tools to suit his needs.

4) Other points
.NET's features like versioning, type-safety and enhanced security also are worth mentioning. You can run 2 versions of the same component at the same time, this is called Side-by-Side execution. Example: You can run ver1 of your Calculator component together with ver2 of it. The application that you wrote with the ver1 does not break-up even when you upgrade your components to ver2.
I could go on but I think I have made enough valid points.

Conclusion
I my view .NET has beaten Sun's Java VM hands down, as I have illustrated. I have heard about Sun's new ONE Platform, but haven't gone through it nor will I go through it, since after my encounter with the power of .NET. I don't think I will be trying anything new for at least sometime now!
I hope this will put a end to all the differences your minds about the .NET platform.

Source: www.mastercsharp.com

Λοιπά θέματα

Απ: .NET Platform vs Sun Java VM version 2

Απ: .NET Platform vs Sun Java VM version 2

.NET Platform vs Sun Java VM version 2