默认情况下
代码语言：javascript复制$ erl
Erlang R15B03 (erts-5.9.3) [source] [64-bit] [smp:8:8] [async-threads:0] [hipe] [kernel-poll:false]
my erlang
Eshell V5.9.3 (abort with ^G)
1>如果要启用Kernel Poll，需要加上 K true参数
代码语言：javascript复制$ erl K true
Erlang R15B03 (erts-5.9.3) [source] [64-bit] [smp:8:8] [async-threads:0] [hipe] [kernel-poll:true]
my erlang
Eshell V5.9.3 (abort with ^G)
1>启用Kernel Poll的好处在于当有很多连接时，可以极大的降低CPU的占用率。对内存和响应延迟没有作用。
Num users | 1500 | 3000 | ||
|---|---|---|---|---|
Kernel Poll | no | yes | no | yes |
Latency (ms) | 16 | 16 | 28 | 28 |
CPU (%) | 15 | 2 | 30 | 4 |
Memory RES (MB) | 84 | 84 | 150 | 150 |
Memory VIRT (MB) | 94 | 94 | 160 | 160 |
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