Transparent process migration: design alternatives and the sprite implementation
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Delta Execution is a preemptive and transparent thread migration mechanism for supporting load distribution and balancing in a cluster of workstations. The design of Delta Execution allows the execution system to migrate threads of a Java application to different nodes of a cluster so as to achieve parallel execution. The approach is to break down and group the execution context of a migrating thread into sets of consecutive machine‐dependent and machine‐independent execution sub‐contexts. Each set of machine‐independent sub‐contexts, also known as a delta set, is then migrated to a remote node in a regulated manner for continuing the execution. Since Delta Execution is implemented at the virtual machine level, all the migration‐related activities are conducted transparently with respect to the applications. No new migration‐related instructions need to be added to the programs and existing applications can immediately benefit from the parallel execution capability of Delta Execution without any code modification. Furthermore, because the Delta Execution approach identifies and migrates only the machine‐independent part of a thread's execution context, the implementation is therefore reasonably manageable and the resulting software is portable.