main.tex

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\put(67.224,-74.15997){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}I. Introduction }
\put(57.024,-104.54){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}In modern distributed computing systems, efficient and scalable communication }
\put(57.024,-123.14){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}is a critical requirement. A Hybrid Centralized and Peer-to-Peer Chat System }
\put(57.024,-141.62){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}aims to leverage the strengths of both centralized and decentralized }
\put(57.024,-160.1){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}communication paradigms. This architecture is particularly useful in scenarios }
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\put(63.384,-235.82){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}II. Abstract }
\put(57.024,-266.18){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}This study introduces a hybrid chat system using MPI, combining centralized }
\put(57.024,-284.69){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}and peer-to-peer (P2P) architectures. A central server manages authentication, }
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\put(57.024,-340.25){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}MPI\_Send, and MPI\_Recv. }
\put(57.024,-370.73){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}The hybrid model reduces server load, lowers latency, and ensures reliable }
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\put(57.024,-407.81){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}MPI's potential for real-time distributed systems. Future work will focus on }
\put(57.024,-426.29){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}enhancing direct P2P communication and system robustness. }
\put(57.024,-456.79){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Use-case: Private Peer-to-Peer Messaging }
\put(75.024,-487.39){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Actors: One User (clients), Centralized Server (for connection setup) }
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\put(111.02,-542.95){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ The server exchanges connection details (e.g., IP addresses) of both }
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\put(129.02,-598.39){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}using MPI point-to-point communication primitives (MPI\_Send }
\put(129.02,-616.99){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}and MPI\_Recv). }
\put(75.024,-635.47){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Key Features: }
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\put(57.024,-135.14){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}The hybrid chat system consists of a centralized server  and peer nodes for }
\put(57.024,-153.62){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}decentralized communication. Key features include: }
\put(75.024,-190.34){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}1. Centralized Server }
\put(75.024,-220.58){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Acts as a directory or control server for node management (e.g., user }
\put(93.02,-239.18){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}authentication, initial connection setup, maintaining user directories, etc.). }
\put(75.024,-257.66){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Handles metadata, such as mapping user IDs to addresses. }
\put(75.024,-276.17){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Centralized server can act as a fallback or backup in case of P2P }
\put(93.02,-294.77){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}communication failure. }
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\put(75.024,-74.28003){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}2. Peer-to-Peer Communication }
\put(75.024,-105.5){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791} Direct messaging between users after initial contact, reducing server load. }
\put(75.024,-136.1){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Once peers are connected, they communicate directly for chat messages, }
\put(93.02,-154.58){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}reducing latency and dependency on the centralized server. }
\put(75.024,-173.06){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● This allows scalability as the number of users increases, avoiding }
\put(93.02,-191.66){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}bottlenecks in the central server. }
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\put(57.024,-534.67){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791} }
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\put(75.024,-74.28003){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}3. Hybrid Model }
\put(75.024,-105.5){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791} A central server is utilized to handle tasks such as user login, registration, }
\put(93.02,-124.1){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}and managing the list of connections. }
\put(75.024,-143.54){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791} When two users wish to exchange messages, the central server facilitates }
\put(93.02,-162.14){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}the connection setup between them. }
\put(75.024,-181.58){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791} Once the connection is established, messages between clients are }
\put(93.02,-200.18){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}exchanged directly in a peer-to-peer (P2P) manner, without routing }
\put(93.02,-218.66){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}through the central server. }
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\put(75.024,-74.28003){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}4. Message Passing with MPI }
\put(57.024,-104.54){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● MPl uses objects called communicators and groups to define which }
\put(75.024,-123.14){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}collection of processes may communicate with each other. }
\put(57.024,-141.62){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Most MPI routines require you to specify a communicator as an argument. }
\put(57.024,-160.1){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Rank: }
\put(75.024,-178.58){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Within a communicator, every process has its own unique, integer }
\put(93.02,-197.18){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}identifier assigned by the system when the process initializes. }
\put(75.024,-215.66){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ A rank is sometimes also called a "task ID". }
\put(75.024,-234.14){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Ranks are contiguous and begin at zero. }
\put(75.024,-252.74){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Used by the programmer to specify the source and destination of }
\put(93.02,-271.25){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}messages. }
\put(57.024,-289.73){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Size }
\put(75.024,-308.21){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Within a communicator, no of processes is defined as size. }
\put(57.024,-326.81){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Nodes in the network can use MPI functions for: }
\put(78.264,-345.29){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Point-to-Point Communication: Direct messaging between two nodes. }
\put(78.264,-363.77){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Collective Communication: Broadcasting messages to groups or all }
\put(96.26,-382.25){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}nodes. }
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\put(57.024,-75){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791} Genenal MPI Program Structure: }
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\put(57.024,-412.01){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791} }
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\put(57.864,-74.15997){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}IV. Implementation }
\put(57.024,-104.54){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Setup with one host (centralized server) and two clients, all running Ubuntu. }
\put(57.024,-135.14){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Operating System: Ubuntu 22.04 (on all nodes). }
\put(57.024,-165.62){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}MPI installed: sudo apt install mpich }
\put(57.024,-196.1){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Python Library: pip install mpi4py }
\put(57.024,-226.46){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Environment Setup }
\put(57.024,-257.06){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Network Details: }
\put(75.024,-287.69){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Server (Host): 192.168.163.175 }
\put(75.024,-306.17){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Client 1: 192.168.163.167 }
\put(75.024,-324.77){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Client 2: 192.168.163.170 }
\put(57.024,-355.25){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Participants: }
\put(75.024,-385.73){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}1. Server (Rank 0): Manages broadcasting, direct messaging, and routing }
\put(93.02,-404.21){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}peer-to-peer messages. }
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\put(75.024,-536.23){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}2. Client 1 (Rank 1): Actively participates in broadcasting and peer-to-peer }
\put(93.02,-554.71){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}messaging. }
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\put(75.024,-74.03998){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}3. Client 2 (Rank 2): Receives messages and responds as part of the }
\put(93.02,-92.53998){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}communication flow. }
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\put(57.024,-224.54){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Step 1: System Initialization }
\put(75.024,-255.02){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● The Server starts first and waits for incoming connections. It uses the }
\put(93.02,-273.53){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}MPI rank 0 as the controller. }
\put(75.024,-292.13){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}● Client 1 and Client 2 initialize, ready to listen for broadcast messages or }
\put(93.02,-310.61){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}participate in peer-to-peer communication. }
\put(508.56,-383.69){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791} }
\put(57.024,-410.81){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Step 2: Broadcast Message from the Server }
\put(75.024,-441.41){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}1. The server administrator selects the broadcast option (Option 1). }
\put(111.02,-459.91){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Input message: Hello to all clients! }
\put(75.024,-478.39){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}2. The server sends the message to all clients using comm.bcast. }
\put(75.024,-496.99){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}3. Client 1 and Client 2 receive the broadcast message: }
\put(111.02,-515.47){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Client 1: [Client 1] Received broadcast message: Hello to all }
\put(129.02,-533.95){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}clients! }
\put(111.02,-552.43){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Client 2: [Client 2] Received broadcast message: Hello to all }
\put(129.02,-571.03){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}clients! }
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\put(57.024,-669.94){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}Step 5: Exit Command }
\put(75.024,-700.42){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}1. The server administrator selects the exit option (Option 4). }
\put(111.02,-719.02){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ The server sends a termination signal to all clients using }
\put(129.02,-737.496){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}co}
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\put(111.02,-74.03998){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ [Server] Shutting down... }
\put(75.024,-92.53998){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}2. All clients gracefully exit: }
\put(111.02,-111.14){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Client 1: [Client 1] Exiting as instructed by the server. }
\put(111.02,-129.62){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}○ Client 2: [Client 2] Exiting as instructed by the server. }
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\put(61.824,-74.15997){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}V. Conclusion }
\put(57.024,-98.53998){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}This hybrid chat system combines centralized coordination with peer-to-peer }
\put(57.024,-117.14){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}messaging using MPI, achieving efficient, low-latency communication and }
\put(57.024,-135.62){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}scalability. The server manages broadcasts and routing, while clients handle }
\put(57.024,-154.1){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}direct interactions, reducing server load. Though the server is a single point of }
\put(57.024,-172.58){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}failure, future improvements like redundancy can enhance reliability. }
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\put(57.864,-229.82){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}VI. References }
\put(57.024,-254.18){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}[1]https://www.mpi-forum.orgl }
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\put(57.024,-328.25){\fontsize{14.04}{1}\usefont{T1}{cmr}{m}{n}\selectfont\color{color_29791}[4] https:// mpi4py.readthedocs.io/ }
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