That system, called PMET, let developers put little "start" and "stop" indicators in their code and then our system would scrape the logs and store the latency histograms in a database. If their page wasn't hitting SLA, they could drill down and figure out why.
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Fun fact: SEHs are CRDTs, and overstat calculation is monotonic, so can be calculated exactly in parallel with no coordination. Percentile calculation isn't monotonic, so needs some coordination.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Is that the same algorithm that hdrhistogram uses?
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IIRC, hdrhistogram uses a top level sparse exponential histogram, with a second level of linear buckets inside each exponential bucket. SEH is just the first level.
End of conversation
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