P2P vs. Client-Server

Quantitative Comparison of P2P with Client-Server

Let’s calculate how long it will take to transmit a file from one server to a number of clients based on both the P2P and server-client architectures. The calculations will be performed based on the following givens.

• A server that can upload at a rate of $up_s$ where $up_s$ is the upload speed in bits/second.
• There are $N$ clients all wanting to download the same file from the server. Client $i$ can upload at a rate of $up_i$ bits/second and download at a rate of $dwn_i$ bits/second.
• The size of the file that all the peers want is $S$.

Client-Server

Let’s start with the client-server architecture. The following can be observed.

• Since $N$ clients each want a file of size $S$, the server will have to upload $NS$ bits. The upload rate of the server is $up_s$

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