[GitHub] [trafficserver] shinrich edited a comment on pull request #6978: Add option for hybrid global and thread session pools

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

shinrich edited a comment on pull request #6978:
URL: https://github.com/apache/trafficserver/pull/6978#issuecomment-663228884


   I did some side-by-side measurements in with three machines in one of our colo's between global pool, hybrid pool, and thread pool.  I ran a python script over the 15 minute squid.log files to calculate the latencies for transactions that go to origin.  The script also computed what percent of those transactions reused an existing origin connection. I combined that with the connection count information from ysar (which pulls traffic_server metrics once a minute).
   
   Reuse Model|Median Latency|90% Latency|99% Latency|% Trans reusing origin connection|concurrent open origin connections
   Global|26ms|293|964|71.48|1972
   Hybrid|21ms|280|928|78.91|3668
   Thread|21ms|284|949|78.36|7998
   
   The global pool has the smallest number of origin connections, but the latency numbers are better for hybrid and thread.  Those two models behave similarly, but the hybrid has far fewer open connections.
   


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