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Scientific experimentation tool
- Shadow is a scientific experimentation tool that simplifies research, development, testing, and evaluation of real networked applications by connecting them through an internally simulated distributed network.
shadow.github.io/
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What is Shadow Network Simulator?
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What is Shadow? Shadow is a scientific experimentation tool that simplifies research, development, testing, and evaluation of real networked applications by connecting them through an internally simulated distributed network.
- The Shadow Simulator
Shadow is a discrete-event network simulator that directly...
- Design Overview
Shadow is a multi-threaded network experimentation tool that...
- The Shadow Simulator
Shadow is a discrete-event network simulator that directly executes real application code, enabling you to simulate distributed systems with thousands of network-connected processes in realistic and scalable private network experiments using your laptop, desktop, or server running Linux.
- Quickstart
- What is Shadow?
- How Does Shadow Work?
- Why is Shadow Needed?
- Caveats
- More Information
After installing the dependencies: build, test, and install Shadow into ~/.local:
Read the usage guide or get started with some example simulations.
Shadow is a discrete-event network simulator that directly executes real application code, enabling you to simulate distributed systems with thousands of network-connected processes in realistic and scalable private network experiments using your laptop, desktop, or server running Linux.
Shadow experiments can be scientifically controlled and deterministically replicated, making it easier for you to reproduce bugs and eliminate confounding factors in your experiments.
Shadow directly executes real applications:
•Shadow directly executes unmodified, real application code using native OS (Linux) processes.
•Shadow co-opts the native processes into a discrete-event simulation by interposing at the system call API.
•The necessary system calls are emulated such that the applications need not be aware that they are running in a Shadow simulation.
Shadow connects the applications in a simulated network:
•Shadow constructs a private, virtual network through which the managed processes can communicate.
Network emulators (e.g., mininet) run real application code on top of real OS kernels in real time, but are non-determinsitic and have limited scalability: time distortion can occur if emulated processes exceed an unknown computational threshold, leading to undefined behavior.
Network simulators (e.g., ns-3) offer more experimental control and scalability, but have limited application-layer realism because they run application abstractions in place of real application code.
Shadow implements over 150 functions from the system call API, but does not yet fully support all API features. Although applications that make basic use of the supported system calls should work out of the box, those that use more complex features or functions may not yet function correctly when running in Shadow. Extending support for the API is a work-in-progress.
That being said, we are particularly motivated to run large-scale Tor Network simulations. This use-case is already fairly well-supported and we are eager to continue extending support for it.
Homepage:
•https://shadow.github.io
Documentation:
•User documentation
•Developer documentation
Community Support:
Jan 24, 2024 · Shadow Network Simulator: An In-depth Look Overview. Shadow stands out in the network simulation arena by blending emulation
Shadow is a discrete-event network simulator that directly executes real application code, enabling you to simulate distributed systems with thousands of network-connected processes in realistic an...
Shadow is a multi-threaded network experimentation tool that is designed as a hybrid between simulation and emulation architectures: it directly executes applications as Linux processes, but runs them in the context of a discrete-event network simulation.
May 20, 2014 · Shadow network simulator web site: https://shadow.github.io/ Tinet. Tinet, or Tiny Network, is another container-based network emulator that has a few good scenarios described in the examples folder in its repository. It is intended to be a simple tool that takes a YAML config file as input and generates a shell script to construct virtual network.
