With the success of multi-core architectures, enterprise applications derive benefits by executing the code in parallel. By definition, a multi-core microprocessor is one that combines two or more independent processors into a single package, often a single integrated circuit (IC). This architecture allows software applications to perform thread-level parallelism (chip-level multiprocessing) without...
Thursday, July 26, 2012
Friday, July 20, 2012
MULTITHREADING AND MULTICORE CPU
After posting the post JAVA CONCURRENCY - PERFORMANCE BOOST, I got a question "how it is going to work in single core CPU and multi core CPU". I was demonstrating the same set of source code for that and I found the program is utilizing only one core of the CPU. I took the help of "htop" tool in Ubuntu...
Thursday, July 19, 2012
GIT - CONTENT MANAGEMENT
The following will guide you through a typical Git workflow. You will create a few files, create a local Git repository and commit your file into this repository. Afterwards, you clone the repository and push and pull some changes between the repositories. The comments (marked with #) before the commands explain the specific actions.
Open a command line / shell for the operations.
Create...
Tuesday, July 17, 2012
GIT - Setup
Git allows you to store global settings in a .gitconfig file. This file is located in the user home directory. As mentioned before Git stores the committer and author in each commit. This and additional information can be stored in the global settings.
The following will configure Git so that a certain user and email address is used, enable color coding and tell Git to ignore certain files.
User...
GIT - INSTALLATION
On Ubuntu you can install the Git command line tool via the following command:
sudo apt-get install git-core
For other Linux distributions please check your vendor documentation.
A windows version of Git can be found on the msysgit Project site. The URL to this webpage is http://code.google.com/p/msysgit...
GIT - INTRODUCTION
Git is a distributed version control system (DVCS) written in C. A version control system allows the creation of a history for a collection of files and includes the functionality to revert the collection of files to another state. Another state might be a different collection of files or different content in the files.
You may, for example, change the collection of files to a state from 2 days...
Thursday, July 12, 2012
JAVA CONCURRENCY - PERFORMANCE BOOST
Well after my last post about Executor Framework, I was desperate about finding the practical usage of the framework. I googled the whole day and found some of the search applications, where they used this approach to search in parallel. This approach drastically improves the time complexity!! no doubt. But one thing I noticed, after submitting the tasks the execution is waiting for a particular...
Wednesday, July 11, 2012
Java 5 Executor Framework
A thread pool is a collection of runnables with a work queue. The threads in the pool constantly run and check the work queue for new work. If there is new work to be done they execute this Runnable.
In Java 5, Executor framework was introduced with the java.util.concurrent.Executor interface. This was introduced to fix some of the shortcomings discussed below.
1. The Executor framework is a framework...
Friday, July 6, 2012
Concurrency: Callable and Future
Till Java 1.4, threads could be implemented by either implementing Runnable or extending Thread. This was quite simple, but had a serious limitation - They have a run method that cannot return values. Java 5 introduces the Callable interface, that allows users to return values from a thread. This post describes the Callable and Future interfaces and shows an example of how to use these to interfaces.
public...