mac修改进程能打开的最大文件数

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mac进程能打开的最大文件数,默认只有256
$ulimit -n
256

这会导致go的服务端运行的时候，如果同时连接的客户端太多，会报错：

2015/08/31 11:47:57 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 10ms
2015/08/31 11:47:58 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 20ms
2015/08/31 11:47:58 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 40ms
2015/08/31 11:47:58 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 80ms
2015/08/31 11:47:58 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 160ms
2015/08/31 11:47:58 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 320ms
2015/08/31 11:47:58 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 640ms
2015/08/31 11:47:59 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 1s
2015/08/31 11:48:00 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 1s
2015/08/31 11:48:01 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 1s
2015/08/31 11:48:02 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 1s
2015/08/31 11:48:03 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 1s
2015/08/31 11:48:04 http: Accept error: accept tcp [::]:12621: too many open files; retrying in 1s

解决办法：

mac修改进程能打开的最大文件数：
1.
$su 切换到root账户
#launchctl limit maxfiles 99999 99999

#ulimit -n 99999

#exit

2.确认修改生效

$ulimit -n

99999

3.每个窗口的服务都必须在重设ulimit -n之后，重启才生效!

4.举例

cd $GOPATH/src/car_server/bentchmark

go run main.go 2>2.log &

tail -f 2.log

grep "connect ok" 2.log | wc -l

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