How capacities manage resources

Capacities evaluate load every 30 seconds, with each bucket referred to as an evaluation cycle. We will use practical examples to explain how the load calculations work in each cycle and what happens when the capacity threshold is reached.

Power BI evaluates capacity utilization using Capacity Unit (CU) time, which is measured in eight CUs per one vCPU when compared to previous Premium-only capacities. If a single vCPU is completely utilized for one second, this is eight CUs. However, this is different from the actual duration when it’s measured from start to finish. Taking our example one step further, if we know that an operation took eight CU seconds, that does not necessary mean that the start-to-finish duration was one second. It could mean that a single vCPU core was 100% utilized for one second or that the operation used less than 100% of the vCPU for more than one second.

Note

P capacities refer to Premium, while F capacities...