Github user hsun-cnnxty commented on the issue:
https://github.com/apache/storm/pull/1591
Tests are done to compare following two code bases:
- baseline: current head of 1.x-branch
(62476f5237a72938c1f0d3fe65dbcdc446a2bd12)
- netty 4.1.x: 1.x-branch-netty4 (dd96d9f4ba5b8da8d68845d7796d29de8bdbe3b8)
In summary:
- netty 4.1.x is able to sustain higher throughput (20k/sec) than baseline
(between 15k -20k/sec)
- netty 4.1.x has lower GC activity which could be the reason that it has
higher throughput**
Also tested different netty configurations regarding buffer allocation
- use direct buffer or heap
- use pooled or unpooled
Result shows the default setting works best.
Performance tests are done on my laptop with following config:
Model Name: MacBook Pro
Processor Name: Intel Core i7
Processor Speed: 2.3 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 16 GB
System Version: OS X 10.10.5 (14F27)
Kernel Version: Darwin 14.5.0
The data collected is attached.
[performance_compare_netty_1.x-branch.zip](https://github.com/apache/storm/files/503682/performance_compare_netty_1.x-branch.zip)
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