Bottlenecks - Cloud Computing

A bottleneck is a phenomenon where the performance or capacity of an entire system is limited (gated) by a single or limited number of components or resources. The terms is based on the analogy of water being poured out of a bottle. The rate of outflow is limited by the width of the conduit of exit—that is, the bottleneck. Increase the width of the bottleneck, and you can increase the rate of which the water flows out. The sad part is, that in computer systems, one bottleneck often masks the existence of the next one down the line, so long as it remains the gating factor. Limit the capacity of one process in a chain of processes, and it reduces the capacity of the whole system. Expand the capacity of the constraining resource, and the system’s processes flow freely until they are once again constrained by the next bottleneck in the chain.

A traffic bottleneck.

A traffic bottleneck

What this all boils down to is that until you make the change designed to relieve the bottleneck and then re-measure, you can’t be sure that you have resolved the problem; however, with adequate understanding, you can fairly reliably predict what will happen

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