Nightly scores or live ranking

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  • Model 01

Difficulty 1 of 5

A shop shows 20 picks per user on its home page. Picks use only yesterday's orders and a catalog that changes once each night. Peak is 3,000 views/s. Keep p99 below 50 ms and cost below 60 USD/mo.

Play level

Options

  • Rank 500 items on CPU at each view
  • Rank 500 items on a GPU at each view
  • Score all users each night and store picks
A batch shares one read of the weightsDrag or use arrow keys to change the batch size

Goals and limits

p99 latency
under 50 ms
Error rate
under 0.1%
Monthly cost
under 60 USD/mo
Traffic
3,000 req/s

Concepts

How players did

Player results load from the server.

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