C1000k TCP connection upper limit test 1

Start the service

Specify a free port , The server will open in sequence 100 Listen on multiple ports , And in the present terminal Hang up

[[email protected] c1000k-master]# ./server  8000
server listen on port: 8000
server listen on port: 8001
server listen on port: 8002
server listen on port: 8003
server listen on port: 8004
server listen on port: 8005
server listen on port: 8006
server listen on port: 8007
server listen on port: 8008
server listen on port: 8009
server listen on port: 8010
server listen on port: 8011
server listen on port: 8012
server listen on port: 8013
server listen on port: 8014
server listen on port: 8015
server listen on port: 8016
server listen on port: 8017
server listen on port: 8018
server listen on port: 8019
server listen on port: 8020
server listen on port: 8021
server listen on port: 8022
server listen on port: 8023
server listen on port: 8024
server listen on port: 8025
server listen on port: 8026
server listen on port: 8027
server listen on port: 8028
server listen on port: 8029
server listen on port: 8030
server listen on port: 8031
server listen on port: 8032
server listen on port: 8033
server listen on port: 8034
server listen on port: 8035
server listen on port: 8036
server listen on port: 8037
server listen on port: 8038
server listen on port: 8039
server listen on port: 8040
server listen on port: 8041
server listen on port: 8042
server listen on port: 8043
server listen on port: 8044
server listen on port: 8045
server listen on port: 8046
server listen on port: 8047
server listen on port: 8048
server listen on port: 8049
server listen on port: 8050
server listen on port: 8051
server listen on port: 8052
server listen on port: 8053
server listen on port: 8054
server listen on port: 8055
server listen on port: 8056
server listen on port: 8057
server listen on port: 8058
server listen on port: 8059
server listen on port: 8060
server listen on port: 8061
server listen on port: 8062
server listen on port: 8063
server listen on port: 8064
server listen on port: 8065
server listen on port: 8066
server listen on port: 8067
server listen on port: 8068
server listen on port: 8069
server listen on port: 8070
server listen on port: 8071
server listen on port: 8072
server listen on port: 8073
server listen on port: 8074
server listen on port: 8075
server listen on port: 8076
server listen on port: 8077
server listen on port: 8078
server listen on port: 8079
server listen on port: 8080
server listen on port: 8081
server listen on port: 8082
server listen on port: 8083
server listen on port: 8084
server listen on port: 8085
server listen on port: 8086
server listen on port: 8087
server listen on port: 8088
server listen on port: 8089
server listen on port: 8090
server listen on port: 8091
server listen on port: 8092
server listen on port: 8093
server listen on port: 8094
server listen on port: 8095
server listen on port: 8096
server listen on port: 8097
server listen on port: 8098
server listen on port: 8099

Running client

[[email protected] c1000k-master]# ./client 127.0.0.1 8000
connections: 922
error: Connection refused
[[email protected] c1000k-master]# 

After running, the server will also exit

...
...
server listen on port: 8095
server listen on port: 8096
server listen on port: 8097
server listen on port: 8098
server listen on port: 8099
connections: 921
error: Too many open files
[[email protected] c1000k-master]# 

Result analysis

Client feedback results

connections: 922
error: Connection refused

Description of the client's first 922 Connection rejected

Server feedback results

connections: 921
error: Too many open files

It indicates that the server can only open 921 A connection , Cannot open more , Touched max-open-files The upper limit prescribed , So quit

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