# cpu\_affinity\_ignore
[TOC]
IO密集型程序中，所有网络中断都是用CPU0来处理，如果网络IO很重，CPU0负载过高会导致网络中断无法及时处理，那网络收发包的能力就会下降。
如果不设置此选项，swoole将会使用全部CPU核，底层根据reactor\_id或worker\_id与CPU核数取模来设置CPU绑定。
> 如果内核与网卡有多队列特性，网络中断会分布到多核，可以缓解网络中断的压力
> 此选项必须与open\_cpu\_affinity同时设置才会生效
~~~
array('cpu_affinity_ignore' => array(0, 1))
~~~
接受一个数组作为参数，array(0, 1) 表示不使用CPU0,CPU1，专门空出来处理网络中断。
## 查看网络中断
~~~
[~]$ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 1383283707 0 0 0 IO-APIC-edge timer
1: 3 0 0 0 IO-APIC-edge i8042
3: 11 0 0 0 IO-APIC-edge serial
8: 1 0 0 0 IO-APIC-edge rtc
9: 0 0 0 0 IO-APIC-level acpi
12: 4 0 0 0 IO-APIC-edge i8042
14: 25 0 0 0 IO-APIC-edge ide0
82: 85 0 0 0 IO-APIC-level uhci_hcd:usb5
90: 96 0 0 0 IO-APIC-level uhci_hcd:usb6
114: 1067499 0 0 0 PCI-MSI-X cciss0
130: 96508322 0 0 0 PCI-MSI eth0
138: 384295 0 0 0 PCI-MSI eth1
169: 0 0 0 0 IO-APIC-level ehci_hcd:usb1, uhci_hcd:usb2
177: 0 0 0 0 IO-APIC-level uhci_hcd:usb3
185: 0 0 0 0 IO-APIC-level uhci_hcd:usb4
NMI: 11370 6399 6845 6300
LOC: 1383174675 1383278112 1383174810 1383277705
ERR: 0
MIS: 0
~~~
eth0/eth1就是网络中断的次数，如果CPU0 - CPU3 是平均分布的，证明网卡有多队列特性。如果全部集中于某一个核，说明网络中断全部由此CPU进行处理，一旦此CPU超过100%，系统将无法处理网络请求。这时就需要使用 cpu\_affinity\_ignore 设置将此CPU空出，专门用于处理网络中断。
如图上的情况，应当设置 cpu\_affinity\_ignore => array(0)
> 可以使用`top`指令 -> 输入 1，查看到每个核的使用率
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- swoole_redis->__construct
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- 异步Http/WebSocket客户端
- swoole_http_client->__construct
- swoole_http_client->set
- swoole_http_client->setMethod
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- swoole_http_client->upgrade
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- swoole_http_client->execute
- swoole_http_client->download
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- 异步Http2.0客户端
- swoole_http2_client->__construct
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- swoole_http2_client->setCookies
- 高级
- Swoole的实现
- Reactor线程
- Manager进程
- Worker进程
- Reactor、Worker、TaskWorker的关系
- Task/Finish特性的用途
- 在php-fpm或apache中使用swoole
- Swoole异步与同步的选择
- TCP/UDP压测工具
- swoole服务器如何做到无人值守100%可用
- MySQL的连接池、异步、断线重连
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- 守护进程程序常用数据结构
- 队列（Queue）
- 堆（Heap）
- 定长数组（SplFixedArray）
- 使用jemalloc优化swoole内存分配性能
- C开发者如何使用Swoole
- C++开发者如何使用Swoole
- 使用systemd管理swoole服务
- 网卡中断设置
- 将Swoole静态编译内嵌到PHP
- 异步回调程序内存管理
- 日志等级控制
- 使用 asan 内存检测
- Windows编译
- Swoole协程之旅-前篇
- Swoole协程之旅-中篇
- Swoole协程之旅-后篇
- 协程CPU密集场景调度实现
- 其他
- 函数列表
- swoole_set_process_name
- swoole_version
- swoole_strerror
- swoole_errno
- swoole_get_local_ip
- swoole_clear_dns_cache
- swoole_get_local_mac
- swoole_cpu_num
- swoole_last_error
- Swoole社区
- Swoole技术会议
- 工作组（Working Groups）
- 参与开源项目指引
- 捐赠Swoole项目
- 加入Swoole开发组
- 非协程特性独立扩展 （swoole_async）
- 附录：Linux信号列表
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- 附录：strace工具的使用
- 附录：gdb工具的使用
- 附录：lsof工具的使用
- 附录：perf工具的使用
- 附录：编译PHP扩展的相关工具
- 备用：已移除的历史特性
- swoole_server->handler
- task_worker_max
- swoole_server->addtimer
- swoole_server->deltimer
- onTimer
- swoole_timer_add
- swoole_timer_del
- swoole_get_mysqli_sock
- swoole_mysql_query
- onMasterConnect
- onMasterClose
- Nginx/Golang/Swoole/Node.js的性能对比
- Coroutine::call_user_func
- Coroutine::call_user_func_array
- Coroutine\Channel::select
- task_async
- 历史：版本更新记录（1.x）
- 1.10.3
- 1.10.2
- 1.10.1
- 1.10.0
- 1.9.23
- 1.9.22
- 1.9.19
- 1.9.18
- 1.9.17
- 1.9.16
- 1.9.15
- 1.9.14
- 1.9.12
- 1.9.11
- 1.9.9
- 1.9.7
- 1.9.6
- 1.9.5
- 1.9.4
- 1.9.3
- 1.9.2
- 1.9.1
- 1.9.0
- 1.8.13
- 1.8.12
- 1.8.11
- 1.8.10
- 1.8.9
- 1.8.8
- 1.8.7
- 1.8.6
- 1.8.5
- 1.8.4
- 1.8.3
- 1.8.2
- 1.8.1
- 1.8.0
- 1.7.22
- 1.7.21
- 1.7.20
- 1.7.19
- 1.7.18
- 1.7.17
- 1.7.16
- 1.7.15
- 1.7.14
- 1.7.13
- 1.7.12
- 1.7.11
- 1.7.10
- 1.7.9
- 1.7.8
- 1.7.7
- 1.7.6
- 1.7.5
- v1.5
- v1.6
- v1.7
- 历史：版本更新记录（2.x）
- 2.0.1-Alpha
- 2.0.5
- 2.0.9
- 1.9.21
- 2.0.10
- 2.0.11
- 2.0.12
- 2.0.13
- 2.1.1
- 2.1.2
- 2.2.0
- 3.0.0
- 历史：版本更新记录（4.x）
- 4.0.3
- 4.0.2
- 4.0.4
- 4.1.1
- 4.1.2
- 4.2.1
- 4.2.2
- 4.2.3
- 4.2.4
- 4.2.5
- 4.2.6
- 4.2.7
- 4.2.9
- 4.2.8
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