Question

What is the main difference between RPC model and an ordinary procedure call
model?

Answer 1

Answer:

In RMI, objects are passed as a parameter rather than ordinary data. This diagram shows the client-server architecture of the RMI protocol. RPC and RMI both are similar but the basic difference between RPC and RMI is that RPC supports procedural programming, on the other hand, RMI supports object-oriented programming.

Answer 2

The main difference between the Remote Procedure Call (RPC) model and an ordinary procedure call model is that in an ordinary procedure call model, the procedure or function is called locally within the same process, whereas in the RPC model, the procedure or function is called remotely over a network.

• In an ordinary procedure call model, the calling program and the called program are part of the same process, and the procedure call is simply a local subroutine call. The calling program pushes the arguments onto the stack and jumps to the called function, which executes the code and returns the result to the calling program. This process is fast and efficient since it doesn't involve any network communication.

• On the other hand, in the RPC model, the calling program and the called program may be running on different machines over a network. The calling program sends a request message containing the function name and arguments to the remote server, which executes the function and sends the result back to the calling program. This process involves network communication, which can be slower and less efficient than a local procedure call.

• The RPC model is useful for distributed systems and client-server applications where the client and server may be running on different machines. The ordinary procedure call model is more suited for centralized systems where all code is executed on a single machine.

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