Uniform memory access

Uniform Memory Access (UMA) is a shared memory architecture used in parallel computers.

All the processors in the UMA model share the physical memory uniformly. In a UMA architecture, access time to a memory location is independent of which processor makes the request or which memory chip contains the transferred data.

Uniform Memory Access computer architectures are often contrasted with Non-Uniform Memory Access (NUMA) architectures.

In the UMA architecture, each processor may use a private cache. Peripherals are also shared in some fashion, The UMA model is suitable for general purpose and time sharing applications by multiple users. It can be used to speed up the execution of a single large program in time critical applications. Unified Memory Architecture (UMA) is a computer architecture in which graphics chips are built into the motherboard and part of the computer's main memory is used for video memory. Multiprocessor are called tightly coupled Systems (TCS) ude to the high degree of resource sharing .(Ruchi Shah)

Types of UMA architectures

1. UMA using bus-based Symmetric Multi-Processing (SMP) architectures
2. UMA using crossbar switches
3. UMA using Multistage interconnection networks

See also

• NUMA

Notes

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