How do you determine the number of shared instances to configure for a server host?

Selecting the same number of shared instances as CPU cores is often a recommended approach because it aligns the server's processing capability with its operational load. Each shared instance can handle requests by leveraging available CPU resources efficiently. By matching the number of shared instances to the CPU cores, you optimize performance, as this ensures that each instance has a dedicated core to work on without overwhelming the processor.

This balance enhances the server's ability to manage concurrency effectively. When the number of shared instances is equal to the number of CPU cores, it allows for parallel processing of requests without bottlenecks, thus providing a more stable and responsive system.

Other approaches may lead to inefficiencies. For example, setting the number based on the minimum users could result in either excessive underutilization or overloading of server resources. Similarly, configuring shared instances based on service types without considering the CPU capacity might lead to performance issues if instances are over-congested or underutilized. Counting all services using shared instances might provide insight into workflows but does not provide a clear guideline for performance optimization like aligning with CPU cores does.