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vSphere High Performance Cookbook by Prasenjit Sarkar

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Ready time – warning sign

To achieve the best performance in a consolidated environment, you must consider a ready time.

Ready time is the time that the vCPU waits, in the queue, for the pCPU (or physical Core) to be ready to execute its instruction. The scheduler handles the queue and when there is contention, and the processing resources are stressed, the queue might become long.

The ready time describes how much of the last observation period a specific world spent waiting in the queue. The ready time for a particular world (for example, a vCPU) is how much time during that interval was spent waiting in the queue to get access to a pCPU. The ready time can be expressed in percentage per vCPU over the observation time and statistically it can't ...

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