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From GitBox <...@apache.org>
Subject [GitHub] franz1981 edited a comment on issue #2494: ARTEMIS-2224 Reduce contention on LivePageCacheImpl
Date Wed, 16 Jan 2019 09:38:13 GMT
franz1981 edited a comment on issue #2494: ARTEMIS-2224 Reduce contention on LivePageCacheImpl
URL: https://github.com/apache/activemq-artemis/pull/2494#issuecomment-454709952
 
 
   @qihongxu 
   What is worrying me is this
   > at most time it obtained a 3k~6k tps
   
   If the same test (same configuration) is performed using just 1 consumer I'm expecting
(best case scenario) that it would have (3k-6k)/200 tps if:
   
   1.  the tps are dependent by the most demanding operation in the CPU flamegraph you've
posted 
   ie `ConcurrentAppendOnlyList:.get(index)`
   2. the `ConcurrentAppendOnlyList:.get(index)` was happening in parallel assuming to have
200 threads available ie bringing a 200 x speedup over a single consumer case
   
   I suppose that 2 can't be true, so it really depends on the number of cores/threads available
to execute such queries to `LivePageCache` IF such queries are performed in parallel.
   Do you have any idea of what's happening here? Which assumptions are correct/wrong?
   Just guessing if this process could be made much better/scalable just answering those questions
:+1: 

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