wy96f commented 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.   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.   3. Running in 51MB size page and 1 page cache in the case of 1 queue. Performance results similar.   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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