Searching a single layer (Algorithm 2)·2 min
What ef buys you
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ef is the size of the working set W. It is the single most important knob in the whole system — so make sure you know what it does.
Knowledge check
During search at layer 0, raising ef from 10 to 200 does what?
Knowledge check
Which ef is set at BUILD time and shapes the graph itself, versus at QUERY time?