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boulder/nonce
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Jacob Hoffman-Andrews d44afa6268 Speed up nonce service. (#3544) 
The service used to do a linear scan for the lowest counter value in its
cross-off list, in order to expire that value. This took about 3ms. I added a
heap to make finding the lowest value more efficient. Now, redeeming a nonce
takes about 3μs.

```
benchmark             old ns/op     new ns/op     delta
BenchmarkNonces-4     1597950       5100          -99.68%
```

Fixes #1219.
 		2018-03-12 15:46:20 -04:00
..
nonce.go Speed up nonce service. (#3544) 2018-03-12 15:46:20 -04:00
nonce_test.go Speed up nonce service. (#3544) 2018-03-12 15:46:20 -04:00