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We're doing RTB with Google DoubleClick AdX, and our bidder (written in Go) can easily handle 4000 QPS per server with only a 0.3 % error rate.

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Is 0.3% error rate caused by GC pause?

From what we can tell, yes. But, according to our Google contacts, we're among the top performers, most parties taking part in RTB perform a lot worse.

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