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Bubble

 
Wikipedia: Bubble (computing)

In computing, a bubble is a "hiccup" in execution of an instruction in an instruction pipeline.

The following is two executions of the same four instruction through a 4-stage pipeline but, for whatever reason, a delay in fetching of the purple instruction in cycle #2 leads to a bubble being created delaying all instructions after it as well.

Pipeline, 4 stage.svg Pipeline, 4 stage with bubble.svg
Normal execution Execution with a bubble

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Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Bubble (computing)" Read more