Thus, the QoS and scalability of the computational system to ensure MMORPG playability is a challenge. Nowadays, of all these genres of on-line games, MMORPGs have become the most popular among network gamers and now attract millions of users. While MMOFPSs consist of many isolated game services with a handful of players each, who are continuously interacting, MMORTSs and MMORPGs consist of a virtual world that never stops and is always up for any player who wants to satisfy their desire for gaming. Their execution requirements vary with the way of playing them. They can be divided into three categories: MMORPG (Massively Multiplayer Online Role Playing Games), MMORTS (Massively Multiplayer Online Real Time Strategy) and MMOFPS (Massively Multiplayer Online First Person Shooter). Massively Multiplayer Online Games (MMOG) are the most popular genre in online computer games.

We show that the balancing mechanism based on the latency criteria provides lower latency than the classical proposal, while in relation to reliability, we obtain a failure probability of under 0.9 % in the worst case, which is amply compensated by the scalability provided by the use of the P2P area. We evaluate the performance of the balancing mechanism taking the criteria of latency and reliability into account, and we compare the effectiveness of the mechanism with a classic approach that applies load balancing to individually players in a Client-Server system. Taking this distinction into account, we propose a mechanism that is focused in the distribution of Auxiliary Games, as an entity, across the pool of servers and peers of the underlying hybrid architecture. We distinguish between the computation associated with the Main Game, that affects all players, and the computation of Auxiliary Games that affects only a few players and acts in isolation from the execution of the Main Game. To manage peak loads that occur during the game, we distribute game computation across the system according to the behavior of MMORPGs. In this work, we tackle the problem of game distribution and scalability by means of a hybrid Client-Server/P2P architecture that can scale dynamically according to the demand. Additionally, gaming aware distribution mechanisms are needed to distribute game instances among servers to avoid load imbalances that affect performance negatively. This huge number of concurrent players requires the availability of high performance computation servers. MMORPG (Massively Multiplayer Online Role Playing Games) is the most popular genre among network gamers, and now attract millions of users, who play simultaneously in an evolving virtual world.

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