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what is the difference between multicore and multiprocessor ?

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posted Nov 11, 2015 by Michael N Hiwanapo

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1 Answer

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Multicore System

A Multi-core processor is a single computing component that has two or more independent cores or processing units. These cores are the ones that read and perform your program’s instructions on your CPU. These instructions are basically your ordinary CPU instructions like add, move data, and branch.

Being a multi-core processing unit, it can execute multiple instructions at the same time. A multi-core processor is intended to lessen the heat coming off your CPU and to increase the speed of processing these instructions. Programs that are said to have an increase in speed do have to be amenable to parallel computing, meaning that instructions can be divided into smaller ones for the multi-core to execute simultaneously.

These cores are usually integrated into a single IC (integrated circuit) die, or onto multiple dies but in a single chip package. A single chip package is a surface mount technology package for your IC. In other words, it houses your much needed electronic parts where your program’s instructions are performed.

Multiprocessor System

In a multiprocessor system two or more CPU’s or central processing units are integrated into a single computer system. So basically it’s having two or more CPU’s on a system physically. Take note however, the system must have support for a multiprocessor to work. It is intended to have a processor perform a program instruction, while the other processor simultaneously performs a different program instruction, speeding up your computing process.

With your multiprocessor, there are things that are worth mentioning like your processor symmetry where you’ll have the option of configuring your system to treat your multiple CPU’s equally. This is called symmetric multiprocessing; alternatively you can configure them in a way where CPU’s are not equal, meaning your system’s resources are divided according to your instructions, called asymmetric multiprocessing.

Another one would be your processor coupling. Your multiple CPU’s that are connected at the bus level have access to a central shared memory, or participate in a memory hierarchy with both local and shared memory. This is common for a PC system user. On the other hand, multiple CPU’s can also be connected via a high speed communication system, in other words multiple separate CPU’s that are connected to work together and are viewed as a single system. This is more common for high performing systems in companies.

Comparison Chart

Multi-processor system: A system with multiple processors of same or different kind. Different dies.

Multicore processor system: A system with a single processor but multiple cores for the same processor. Often integrated on the same die.

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Multicore vs Multiprocessor Systems

What’s the difference between a multicore and a multiprocessor system? Both may seem sound similar, but they actually differ in many ways. Actually, the only similarities they have are their intentions of speeding up your computing processes.

A multicore uses a single CPU while a multiprocessor uses multiple CPU’s. That being said, a multiprocessor system will cost more and will require a certain system that supports multiprocessors. In regards to their speed, if both systems have the same clock speed, number of CPU’s and cores and RAM, the multicore system will run more efficiently on a single program. This is because the cores can execute multiple instructions at the same time, but not multiple programs; this is because of its shared cache (L1, L2, and L3). This is where your multiprocessor comes in handy. With each CPU having their own cache, they can execute programs simultaneously but will take longer than your multicore.

To summarize, a multicore system is a more favorable system for ordinary users. It does not demand any support or extra configurations and will likely cost a bit less. Performance-wise, depending on how you run your programs, each has their pros and cons.

answer Nov 12, 2015 by Manikandan J
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