摘要:
A method and system are disclosed for verifying consistency of an instruction execution order of a multiprocessor data processing system with a specified memory consistency model. Each processor within the multiprocessor data processing system executes instructions from an associated one of a number of instruction streams, which include instructions that store a number of unique values from multiple processors to a single selected address within memory. One of the unique values is loaded from the selected address to a particular processor within the data processing system. A set of valid values which may be returned by the loading step is determined according to the specified memory consistency model. By comparing the unique value with members of the set of valid values, the instruction execution order of the multiprocessor data processing system is verified. Utilizing the unique value which was returned by the load instruction, the set of valid values may then be updated.
摘要:
One embodiment of the present invention provides a system that facilitates cache coherence with adaptive write updates. During operation, a cache is initialized to operate using a write-invalidate protocol. During program execution, the system monitors the dynamic behavior of the cache. If the dynamic behavior indicates that better performance can be achieved using a write-broadcast protocol, the system switches the cache to operate using the write-broadcast protocol.
摘要:
A method of arbitrating data transmissions to prevent data collisions in an optical data interconnect system including a transmitting node, a plurality of receiving nodes, and one or more remaining nodes connected through an optical data channel. The method involves transmitting a transmission request signal from the transmitting node over an arbitration channel corresponding to the transmitting node, monitoring, at the transmitting node, a plurality of arbitration channels corresponding to each of the plurality of receiving nodes and the one or more remaining nodes at the transmitting node for a predetermined period of time, determining a start time for a data transmission from the transmitting node based on the monitored signals to prevent a data collision, and initiating a data transmission of a data signal from the transmitting node over the optical data channel at the determined start time.