Will too many TCP connections in Linux cause the program to hang?

Too many TCP connections in Linux will cause the program to hang. The situations are as follows: 1. The program exceeds the maximum number of file descriptors limited by the system, resulting in the inability to create new connections and even causing the program to crash; 2. Too many connections lead to insufficient memory, which in turn affects the normal operation of the program; 3. The CPU load is too high, causing the program's performance to decrease or even become unresponsive; 4. The network bandwidth or system resources are limited, which may cause connection timeouts, increased delays, or Problems such as packet loss may affect the normal operation of the program.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

Too many TCP connections may cause the program to hang. When a program handles a large number of TCP connections, it may consume system resources, including memory, CPU, and network bandwidth. If the program does not manage these connections correctly or there are insufficient system resources, it may cause the program to crash or become unresponsive.

The following are some situations that may cause the program to hang:

1. File descriptor restrictions: Each TCP connection requires a file descriptor for management. In some operating systems, the number of file descriptors is limited. If the program exceeds the maximum number of file descriptors limited by the system, it will fail to create new connections and may even cause the program to crash.

2. Memory consumption: Each TCP connection needs to allocate certain memory resources to store connection status, buffer and other information. If the number of connections is too large, it may cause insufficient memory and affect the normal operation of the program.

3. CPU load: Handling a large number of TCP connections increases the load on the CPU, especially when performing heavy calculations or intensive data transfers. If the CPU load is too high, it may cause the program's performance to decrease or even become unresponsive.

4. Network bandwidth and throughput: When a program handles a large number of TCP connections, it may consume a large amount of network bandwidth and system resources. If network bandwidth or system resources are limited, it may cause problems such as connection timeout, increased latency, or packet loss, which will affect the normal operation of the program.

Therefore, in order to ensure the stability and reliability of the program, it is necessary to reasonably manage and limit the number of TCP connections, and optimize the program to ensure effective utilization of system resources.

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