Test ab fails after 100 connections with many workers tarantool

[MrSipping]

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Hi, trying to test with ab on tarantool I noticed that if I put only one worker in the openresty configuration the test doesn't fail instead if I put more workers, having more CPUs, the test fails after 100,000 connections. Can you give me an explanation?

[zhuizhuhaomeng]

you can see the error log file in /usr/local/openresty/nginx/logs/error.log. I think it is due to the lack of the local port.

[MrSipping]

you can see the error log file in /usr/local/openresty/nginx/logs/error.log. I think it is due to the lack of the local port.

This is the error:

apr_socket_connect(): Cannot assign requested address (99)

[zhuizhuhaomeng]

You need to calculate the total number of connections you need.

Suppose there is only one IP address on your host. So there are not more than 65000 local ports available. You can check the local port range by the following cmd.

➜  ~ sudo sysctl -a | grep local_port 
net.ipv4.ip_local_port_range = 32768	60999

One connection would consume one local port.

Every time-wait TCP connection would last for a long time if you did not enable tcp_tw_reuse. Check it by the following cmd.

sudo sysctl -a | grep reuse
net.ipv4.tcp_tw_reuse = 1