Analysis of information sources in references of the Wikipedia article "Java performance" in English language version.
Using the Server compiler, which is best tuned for long-running applications, have instead demonstrated that Java is from 1.09 to 1.91 times slower(...)In conclusion, the results obtained with the server compiler and these important features suggest that Java can be considered a valid alternative to C++
It is hard to give a rule-of-thumb where SWT would outperform Swing, or vice versa. In some environments (e.g., Windows), SWT is a winner. In others (Linux, VMware hosting Windows), Swing and its redraw optimization outperform SWT significantly. Differences in performance are significant: factors of 2 and more are common, in either direction
Deoptimization is very exciting when dealing with performance concerns, since it means you can make much more aggressive optimizations...knowing you'll be able to fall back on a tried and true safe path later on
What happens if you've already inlined A's method when B comes along? Here again the JVM shines. Because the JVM is essentially a dynamic language runtime under the covers, it remains ever-vigilant, watching for exactly these sorts of events to happen. And here's the really cool part: when situations change, the JVM can deoptimize. This is a crucial detail. Many other runtimes can only do their optimization once. C compilers must do it all ahead of time, during the build. Some allow you to profile your application and feed that into subsequent builds, but once you've released a piece of code it's essentially as optimized as it will ever get. Other VM-like systems like the CLR do have a JIT phase, but it happens early in execution (maybe before the system even starts executing) and doesn't ever happen again. The JVM's ability to deoptimize and return to interpretation gives it room to be optimistic...room to make ambitious guesses and gracefully fall back to a safe state, to try again later.
We first perform some micro benchmarks for various JVMs, showing the overall good performance for basic arithmetic operations(...). Comparing this implementation with a Fortran/MPI one, we show that they have similar performance on computation intensive benchmarks, but still have scalability issues when performing intensive communications.
Escape analysis is a technique by which the Java Hotspot Server Compiler can analyze the scope of a new object's uses and decide whether to allocate it on the Java heap. Escape analysis is supported and enabled by default in Java SE 6u23 and later.
At the OS level, all of these megabytes have to be read from disk, which is a very slow operation. Actually, it's the seek time of the disk that's the killer; reading large files sequentially is relatively fast, but seeking the bits that we actually need is not. So even though we only need a small fraction of the data in these large files for any particular application, the fact that we're seeking all over within the files means that there is plenty of disk activity.
It is hard to give a rule-of-thumb where SWT would outperform Swing, or vice versa. In some environments (e.g., Windows), SWT is a winner. In others (Linux, VMware hosting Windows), Swing and its redraw optimization outperform SWT significantly. Differences in performance are significant: factors of 2 and more are common, in either direction
This is the first time that either a Java or an open source program has won.
The hardware and operating system details are:(...)Sun Java JDK (1.6.0_05-b13 and 1.6.0_13-b03) (32 and 64 bit)
This is the first time that either a Java or an open source program has won.
The hardware and operating system details are:(...)Sun Java JDK (1.6.0_05-b13 and 1.6.0_13-b03) (32 and 64 bit)
