What is the relationship between cloud server vCPU and physical CPU?

The vCPU in the cloud server is a processor that simulates running on the CPU of the physical server. A physical server can usually support multiple vCPU instances, and each instance runs independently.

The number of these vCPUs depends on the configuration of the physical server and the cloud service provider's policy.

The relationship between vCPU and physical CPU is achieved through time-division multiplexing technology, which means that the time of the physical CPU is divided into multiple time segments, and each segment is allocated to the vCPU of a virtual machine instance.

Therefore, the vCPU of a virtual machine instance can only use the time slice assigned to it, not the entire physical CPU.

The performance of vCPU is limited by the underlying physical CPU. For example, a physical server with 4 CPU cores and 8 threads supports the creation of up to 8 vCPUs.

However, since a vCPU can only access the time slice of the physical CPU core assigned to it, the actual performance of the vCPU may be affected.

In short, vCPU is a virtual processor running on a physical CPU, and their number and performance are limited by the physical CPU.

When choosing a cloud server, you must choose the appropriate number of vCPUs and physical CPU configuration according to your application needs to achieve performance and stability.

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