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What does container churn mean in Docker?

I am watching this video. At 9:46 they talk about how fast containers can churn. What does the churn mean?

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I Googled the churn word definition and it says that churn is a machine or container in which butter is made by agitating milk or cream. So, does it mean that the Docker containers can make the real butter and milk?

I can see no other definition of the container churning online.

manymanymore
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    My guess is that this would refer to an artificial benchmark destroying and recreating containers. I'd be surprised if this number were _only_ 9x – my baseline assumption would be that booting a VM takes about a minute but you can create multiple containers per second. Still, neither should be in your runtime critical path and so this is a little bit of an artificial metric. – David Maze Nov 21 '22 at 15:30

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