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Concurrency in a function service refers to

  • A.the number of distinct event sources attached to a function
  • B.the total number of invocations counted over a whole month
  • C.the number of invocations executing at the same instant
  • D.the number of separate functions deployed in the account

Answer: C

Correct answer: the number of invocations executing at the same instant

Concurrency is a measure of simultaneity, not of volume. A function called a million times a month, each taking 50 milliseconds, may never exceed a concurrency of two; one called a thousand times an hour, each taking a minute, sustains a concurrency of about seventeen. Since limits are set on concurrency, it is the product of rate and duration that matters.

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