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java Programming Glossary: cpusIs shifting bits faster than multiplying and dividing in Java? .NET? http://stackoverflow.com/questions/1168451/is-shifting-bits-faster-than-multiplying-and-dividing-in-java-net than multiplication and division operations on most all CPUs if you happen to be using a power of 2. However it can reduce..
How do I optimize for multi-core and multi-CPU computers in Java? http://stackoverflow.com/questions/1223072/how-do-i-optimize-for-multi-core-and-multi-cpu-computers-in-java Java to force different threads to run on different cores CPUs java concurrency multithreading multicore share improve this.. Java to force different threads to run on different cores CPUs I interpret this part of your question as meaning that you have..
How many threads should I use in my Java program? http://stackoverflow.com/questions/130506/how-many-threads-should-i-use-in-my-java-program would be susceptible to cache contention between multiple CPUs this is particularly nasty because it has the potential to hit.. Cache contention is a very important aspect of using multi CPUs to process a highly parallelized algorithm Make sure that you.. on you can greatly reduce cache contention between the CPUs. For example it may be easier to have a big array of ints and..
Is Java a Compiled or an interpreted programming language? http://stackoverflow.com/questions/1326071/is-java-a-compiled-or-an-interpreted-programming-language
Java NIO FileChannel versus FileOutputstream performance / usefulness http://stackoverflow.com/questions/1605332/java-nio-filechannel-versus-fileoutputstream-performance-usefulness but modern Sun and IBM versions on general purpose CPUs are good to go. What happens is the data goes straight to from..
What's the most elegant way to concatenate a list of values with delimiter in Java? http://stackoverflow.com/questions/1642159/whats-the-most-elegant-way-to-concatenate-a-list-of-values-with-delimiter-in-ja results without complex if s. Also note that with modern CPUs the assignment will happen only in the cache or probably only..
Which of these pieces of code is faster in Java? http://stackoverflow.com/questions/1656506/which-of-these-pieces-of-code-is-faster-in-java a 50 jnz loop That's because the zero flag in most sane CPUs is set by the decrement instruction when you reach zero. The..
How does the code behave different for Java and C compiler? http://stackoverflow.com/questions/1788696/how-does-the-code-behave-different-for-java-and-c-compiler a into a register and then they can b to it stack based CPUs don't they push all the values on the stack and then use operators.. this problem it's still deterministic. For stack based CPUs that don't have any registers the result should be 8 since they.. start evaluating the right hand side. For register based CPUs it should always be 6. Morale The standard is always right but..
http://stackoverflow.com/questions/215236/threads-per-processor per core I get 16 threads 2 logical threads per CPU x 4 CPUs x the arbitrary multiplier of 2 . if instead I use a eight core.. 8 threads per core I get 128 threads 8 threads per CPU x 8 CPUs x the arbitrary multiplier of 2 if I deploy the same software.. and all applications including availableProcessors as 2 CPUs so if your application can use hyperthreading you will get the..
Does Java have support for multicore processors/parallel processing? http://stackoverflow.com/questions/3330430/does-java-have-support-for-multicore-processors-parallel-processing to match the number of threads to the number of available CPUs for example int n Runtime.getRuntime .availableProcessors ..
Difference between volatile and synchronized in JAVA (j2me) http://stackoverflow.com/questions/3519664/difference-between-volatile-and-synchronized-in-java-j2me between it and main memory threads running on different CPUs or cores can see memory differently at any given moment in time..
http://stackoverflow.com/questions/4633866/is-volatile-expensive that LoadLoad and LoadStore are effectively no ops on X86 CPUs. Does this mean that volatile read operations can be done without.. multi CPU systems there must be some config option to the CPUs that this is not enough and main memory has to be hit making..
Is there a Java library for unsigned number type wrappers? http://stackoverflow.com/questions/8193031/is-there-a-java-library-for-unsigned-number-type-wrappers way. The wrapping and unwrapping will also eat up your CPUs for nothing. That even simple arithmetic is a PITA to write..
What is the difference of Atomic / Volatile / synchronize? http://stackoverflow.com/questions/9749746/what-is-the-difference-of-atomic-volatile-synchronize local CPU memory some cache and not be visible for other CPUs cores and thus threads . This is why many refer to local copy..
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