Mr. R Y Naidu.
Asst. Professor, Dept. of MCA.
Asst. Professor, Dept. of MCA.
Many different hardware architectures exist today to perform a
single task using multiple processors.
Grid computing:a combination of computer resources from multiple administrative
domains applied to a common task.
MPP (Massively
Parallel Processor) systems known as the
supercomputer architecture.
Cluster server system a network of general-purpose computers.
SMP (Symmetric
Multiprocessing) system identical processors
(in powers of 2) connected together to act as one unit.
Multi-core processor a single chip with numerous computing cores.
Flynn's
Taxonomy:
Flynn's Taxonomy is a classification of computer architectures
proposed by Michael J. Flynn . It is based on the concurrency of
instruction and data streams available in the architecture. An instruction
stream is the set of instructions that makes up a process, and a data stream is
the set of data to be processed.
1. Single Instruction, Single Data stream
(SISD)
SISD system is a sequential system where one instruction stream
process one data stream. The pre-2004 PCs were this type of system.
2. Single Instruction, Multiple Data streams
SIMD)
One instruction is broadcasted across many compute units, where
each unit processes the same instruction on different data. The vector
processor, a type of a supercomputer, is an example of this architecture type.
Recently, various micro-processors include SIMD processors. For example, SSE
instruction on Intel CPU, and SPE instruction on Cell Broadband Engines
performs SIMD instructions.
3. Multiple Instruction, Single Data stream
(MISD)
Multiple instruction streams process a single data stream. Very
few systems fit within this category, with the exception for fault tolerant
systems.
4. Multiple Instruction, Multiple Data streams
(MIMD)
Multiple processing units each process multiple data streams
using multiple instruction streams.
Using this classification scheme, most parallel computing
hardware architectures, such as the SMP and cluster systems, fall within the
MIMD category. For this reason, the MIMD architecture is further categorized by
memory types.
Distributed
Memory type:
Tasks that take too long using one computer can be broken up to
be performed in parallel using a network of processors. This is known as a
cluster server system, which is perhaps the most commonly-seen distributed
memory type system. This type of computing has been done for years in the HPC
(High Performance Computing) field, which performs tasks such as large-scale
simulation.
MPP (Massively
Parallel Processor) system
is also another commonly-seen distributed memory type system. This connects
numerous nodes, which are made up of CPU, memory, and a network port, via a
specialized fast network. NEC's Earth Simulator and IBM's blue Gene are some of
the known MPP systems.
Shared
Memory Type:
In shared memory type systems, all processors share the same
address space, allowing these processors to communicate with each other through
Read/Writes to shared memory. Since data transfers/collections are unnecessary,
this results in a much simpler system from the software perspective. shared
memory type system are the Symmetric Multiprocessing (SMP) systems.
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