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A producer runs at 1000 items per second and a consumer at 900. The queue will

  • A.oscillate about half full indefinitely
  • B.fill and then block or overflow, whatever its size
  • C.reach a steady occupancy of about ten per cent
  • D.remain empty, the consumer keeping ahead

Answer: B

Correct answer: fill and then block or overflow, whatever its size

A queue absorbs a burst, not a sustained mismatch. At 100 items a second of surplus, any finite queue fills in a finite time, after which the producer blocks or items are lost. The remedy is to make the consumer faster or the producer slower - a larger queue only postpones the moment.

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