New epoll event engine implemention that may be more effecient #295
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A new epoll event engine implementation (EPOLL_NG) which use epoll groups to manage read/write events.
This is much simpler and use no on-heap memory allocation, with better performance, as mentioned in #268
Edge-trigger related feature will be implemented in future.
New engine shows 3%~5% throughput/QPS improvement by
net-perf
test.