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Updating array using multiple threads java

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Background False sharing is a well-known performance issue on SMP systems, where each processor has a local cache.It occurs when threads on different processors modify variables that reside on the same cache line, as illustrated in Figure 1.A thread is sometimes called a lightweight process or an execution context Imagine an online ticket reservation application with a lot of complex capabilities.One of its functions is "search for train/flight tickets from source and destination" another is "check for prices and availability," and a third time-consuming operation is "ticket booking for multiple clients at a time".

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The formal definition of a thread is, A thread is a basic processing unit to which an operating system allocates processor time, and more than one thread can be executing code inside a process.In a single-threaded runtime environment, these actions execute one after another.The next action can happen only when the previous one is finished.The source line shown in red in the following example code causes false sharing: (the source line shown in red), which invalidates the cache line for all processors. False sharing occurs when threads on different processors modify variables that reside on the same cache line.This invalidates the cache line and forces a memory update to maintain cache coherency.This circumstance is called false sharing because each thread is not actually sharing access to the same variable.Access to the same variable, or true sharing, would require programmatic synchronization constructs to ensure ordered data access.Upon termination, an executor has no tasks actively executing, no tasks awaiting execution, and no new tasks can be submitted.An unused Executor Service should be shut down to allow reclamation of its resources. Try running this more than one time and you may see different result as all threads are executing in parallels and who ever gets fast result, you will see result posted in Eclipse console. The JRuby runtime itself is considered to be threadsafe.From Java, you can use a single runtime safely across threads, provided the code in those threads does not do thread-unsafe Ruby operations listed below.