[GitHub] [couchdb] ksnavely edited a comment on issue #2360: Make the rexi:stream2 interface unacked message limit configurable

[GitBox <gi...@apache.org>]

ksnavely edited a comment on issue #2360: Make the rexi:stream2 interface unacked message limit configurable
URL: https://github.com/apache/couchdb/pull/2360#issuecomment-571333719
 
 
   Alright, @wenli200133 ran some partitioned query benchmarks for this recently, here is what she found:
   
   
   q | stream_limit | mean rows | std-dev % | ratio | 3 std-dev %
   -- | -- | -- | -- | -- | --
   1 | 5 | 519961.67 | 0.48 |   |  
   1 | 10 | 519948 | 0.82 | 0.999974 | 2.8504736
   1 | 100 | 385213.67 | 30.3 | 0.74087 | 90.933281
   1 | 1000 | 388600.33 | 28 | 1.008792 | 123.76918
   8 | 5 | 2739565.67 | 0.23 |   |  
   8 | 10 | 2750676.33 | 1.01 | 1.004056 | 3.1075714
   8 | 100 | 2753663.67 | 0.21 | 1.001086 | 3.0948021
   8 | 1000 | 2763239.67 | 0.55 | 1.003478 | 1.7661823
   
   For higher Q values, there was no statistically significant variation in performance with the stream limit. Note the large instability at 100 and 1000 for q=1. Again this was for 1000 keys queried using startkey and limit.

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