Duemu

Duemu is a term used in computing to denote a dual-emulation unit, a software architecture intended to run two emulation engines in parallel within a single process or system. The concept appears in research and hobbyist projects to compare environments or provide cross-compatibility layers between hosts and targets.

A typical duemu design includes core emulation engines, a synchronization component for timing and events, and an interface layer that mediates access to host resources such as memory and peripherals. The design is typically modular, enabling different cores to be plugged in and swapped for testing.

Duemu is used to compare behavior across architectures, validate cross-platform software, and study state synchronization, checkpointing, and resource sharing. The term is not standardized and appears in multiple open-source projects and academic papers with varying definitions.

Common features across projects include parallel execution of two emulation streams, deterministic replay or controlled nondeterminism, and adapters for host system calls.

Applications include retro-gaming emulation, virtualization research, and automated cross-platform testing. Related topics are emulation, virtualization, cross-architecture testing, and time synchronization.