[GitHub] [activemq-artemis] wy96f edited a comment on issue #2750: ARTEMIS-2399 Improve performance when there are a lot of subscribers

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wy96f edited a comment on issue #2750: ARTEMIS-2399 Improve performance when there are a lot of subscribers
URL: https://github.com/apache/activemq-artemis/pull/2750#issuecomment-511398767
 
 
   @michaelandrepearce I deployed the test without MAX_DEPAGE_NUM limit during depage. The performance result as follows:
   1. Running in 51MB size page and 1 page cache in the case of 100 multicast
   queues. The consumer tps dropped to ~11000 compared to ~16000 in pr.
   ![image](https://user-images.githubusercontent.com/7719761/61217429-45120600-a742-11e9-8f52-835b10cbabaf.png)
   ![image](https://user-images.githubusercontent.com/7719761/61217451-4f340480-a742-11e9-8d5a-690b69312d6f.png)
   2. Running in 5MB size page and 100 page cache in the case of 100 multicast
   queues.  The consumer tps dropped to ~10000 compared to ~15000 in pr.
   ![image](https://user-images.githubusercontent.com/7719761/61217513-6e329680-a742-11e9-991e-b90a83f2001e.png)
   ![image](https://user-images.githubusercontent.com/7719761/61217537-74c10e00-a742-11e9-84d1-23c136eaa59a.png)
   3. Running in 51MB size page and 1 page cache in the case of 1 queue. Performance results similar.
   ![image](https://user-images.githubusercontent.com/7719761/61217894-4abc1b80-a743-11e9-88ad-c9fa9a1f2a61.png)
   ![image](https://user-images.githubusercontent.com/7719761/61217904-514a9300-a743-11e9-9334-47725ba33773.png)
   
   Seems like paged message removed and re reading file resulted in the performance drop particularly in the case of heavy usage of memory(test 1,2). Even if there was enough free memory and messages were not gced(test 3), the performance didn't make a big difference - instead memory footprint might be increased. Considering we've totally relied on the kernel page cache, it seems not to need spare messages in memory. I personally assume this is an import feature.
   

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