Multicore Processor Architecture

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Multicore Architecture is a major focus in modern computer architecture research. for both product development and research, multiple core processor simulation environments are necessary.A multi-core processor is a processing system composed of two or more independent cores. The cores are typically integrated onto a single integrated circuit die (known as a chip multiprocessor or CMP). A multi-core processor implements multiprocessing in a single physical package. They may implement message passing or shared memory inter-core communication methods.but may not necessarily share a single cache. cores in multi-core systems may implement architectures like superscalar, VLIW, vector processing, SIMD, or multithreading.
Multi-core processors will also play a central role in driving important advancements in PC security and virtualization technologies that are being developed to provide greater protection, resource utilization and value for the commercial computing market.General consumers, too, will have access to greater performance than ever before, which will significantly expand the utility of their home PCs and digital media computing systems.Multi-core processors will also have the benefit of offering performance without having to increase power requirements,which will translate into greater performance per watt.Placing two or more powerful computing cores on a single processor opens up a world of important new possibilities. The next generation of software applications will likely be developed using multi-core processors because of the performance and efficiency they can deliver compared to single core processors.Whether these
applications help professional animation companies produce more realistic movies faster for less money or create breakthrough ways to make a PC more natural and intuitive, the widespread availability of hardware using multi-core processor technology will forever change the computing universe.
This paper focuses on the architecture of the multicores and the differences between the multicore and the simultaneous multi threading (SMT) concept and their architectural differences.The memory hierarchy of the multiprocessors are also described here with the real time applications of the multicore architectures.The introduction of snooping and invalidation too added with the architecture.Programming is an important phenomena which decides the reliability of an architecture.programmers use threads and write parallel algorithms so safety also becomes a key to this architechture.The role of operating system to adapt to the multicore architecture is too a key.The usage of affinity masks to assign processes to cores becomes the most essential part of the architecture.

It has always been a frequent question -- "Will I benefit from multiple processors?" With the growing popularity of dual core processors, the topic is more important than ever! Will multiple processors or a dual core processor be beneficial to you, and what are the differences between them? These are the questions this article will attempt to lay to rest.

A major question for some people getting ready to buy a high-end system is whether they want or need to have two processors available to them. For anyone doing video editing, multi-threaded applications, or a lot of multitasking the answer is a very clear 'yes'. Then the question becomes whether two separate processors (as in a dual Xeon or Opteron system) is the way to go, or whether a single dual core processor (like a Pentium D or Athlon64 X2) will do just as well.


A multi-core CPU (or chip-level multiprocessor, CMP) combines two or more independent cores into a single package composed of a single integrated circuit (IC), called a die, or more dies packaged together. A dual-core processor contains two cores and a quad-core processor contains four cores. A multi-core microprocessor implements multiprocessing in a single physical package. A processor with all cores on a single die is called a monolithic processor. Cores in a multicore device may share a single coherent cache at the highest on-device cache level (e.g. L2 for the Intel Core 2) or may have separate caches (e.g. current AMD dual-core processors). The processors also share the same interconnect to the rest of the system. Each "core" independently implements optimizations such as superscalar execution, pipelining, and multithreading. A system with N cores is effective when it is presented with N or more threads concurrently. The most commercially significant (or at least the most 'obvious') multi-core processors are those used in computers (primarily from Intel & AMD) and game consoles (e.g., the Cell processor in the PS3). In this context, "multi" typically means a relatively small number of cores. However, the technology is widely used in other technology areas, especially those of embedded processors, such as network processors and digital signal processors, and in GPU?s.

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