Clustered computer systems;  parallel computing;  availability;  Scalability

High-performance computer technology is one of the important symbols to measure a country’s scientific and technological level and comprehensive national strength, and at present, some developed countries in the world are competing to invest huge amounts of money in its development and research. PC cluster computers are the cheapest high-performance computers. Some key technologies in the construction of clustered computer systems, such as scalability, availability, resource management, load balancing and parallel programming environment, are discussed, and an example of parallel programming based on MPI environment is given, and its practical significance in different fields is also proposed according to the characteristics of clustered systems.