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Such an event is often called a bubble, by analogy with an air bubble in a fluid pipe. In some architectures, the execution stage of the pipeline must always be performing an action at every cycle. In that case, the bubble is implemented by feeding NOP ("no operation") instructions to the execution stage, until the bubble is flushed past it.
insert a pipeline bubble whenever a read after write (RAW) dependency is encountered, guaranteed to increase latency, or; use out-of-order execution to potentially prevent the need for pipeline bubbles; use operand forwarding to use data from later stages in the pipeline; In the case of out-of-order execution, the algorithm used can be:
In architecture, the term "bubble chart" is also applied to a first architectural sketch of the layout constructed with bubbles. [ 5 ] In software engineering , "bubble chart" can refer to a data flow , a data structure or other diagram in which entities are depicted with circles or bubbles and relationships are represented by links drawn ...
Structure charts are used in structured analysis to specify the high-level design, or architecture, of a computer program. As a design tool, they aid the programmer in dividing and conquering a large software problem, that is, recursively breaking a problem down into parts that are small enough to be understood by a human brain.
In computer engineering, instruction pipelining is a technique for implementing instruction-level parallelism within a single processor. Pipelining attempts to keep every part of the processor busy with some instruction by dividing incoming instructions into a series of sequential steps (the eponymous "pipeline") performed by different processor units with different parts of instructions ...
Executive Perspective (Scope Contents) – The first architectural sketch is a "bubble chart" or Venn diagram, which depicts in gross terms the size, shape, partial relationships, and basic purpose of the final structure. It corresponds to an executive summary for a planner or investor who wants an overview or estimate of the scope of the ...
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Architecture evolution is the process of maintaining and adapting an existing software architecture to meet changes in requirements and environment. As software architecture provides a fundamental structure of a software system, its evolution and maintenance would necessarily impact its fundamental structure.