Powerful mainstream computing equipment and the advent of affordable multi-Gigabit communication technology allow us to tackle data acquisition problems with clusters of inexpensive computers.Such networks typically incorporate heterogeneous plat forms,real-time partitions and custom devices.Therefore,one must strive for a software infrastructure that efficiently combines the nodes to a single,unified resource for the user,Overall requirements for such middleware are high efficiency and configuration flexibility. Intelligent I/O(I2O) is an industry specification that defines a unifrom messaging format and executing model for processor-enabled communication equipment.Mapping this concept to a distribulted computing environment and encapsulating the details of the specification into an application-programming framework allow us to provide run-time support for cluster operation.This paper gives a brief overview of a framework.XDAQ that we designed and implemented at CERN for the Compact Muon Solenoid experiment's prototype data acquisition system.
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