By Daniel Aarno, Jakob Engblom
Virtual systems are discovering frequent use in either pre- and post-silicon software program and process improvement. They decrease time to industry, enhance procedure caliber, make improvement extra effective, and let really concurrent hardware/software layout and bring-up. digital systems bring up productiveness with remarkable inspection, configuration, and injection services. together with different varieties of simulators, they supply full-system simulations the place desktops will be confirmed including the surroundings during which they function.
This e-book is not just approximately what simulation is and why it will be significant, it is going to additionally conceal the tools of establishing and utilizing simulators for computer-based structures. inside of you’ll discover a entire e-book approximately simulation most sensible perform and layout styles, utilizing Simics as its base besides real-life examples to get the main from your Simics implementation. You’ll know about: Simics structure, model-driven improvement, digital platform modelling, networking, contiguous integration, debugging, opposite execution, simulator integration, workflow optimization, software automation, and lots more and plenty more.
- Distills a long time of expertise in utilizing and construction digital systems to aid readers notice the entire capability of digital platform simulation
- Covers modeling comparable use-cases together with units, structures, extensions, and fault injection
- Explains how simulations can impact software program improvement, debugging, procedure configuration, networking, and more
- Discusses the right way to construct entire full-system simulation structures from a mixture of simulators
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Additional info for Software and system development using virtual platforms : full-system simulation with Wind River Simics
The amount of time advanced each turn is the time quantum, which is sometimes called the CPU switch time. For example, assume a system with three clocks and a time quantum Q. 9. 9 Round-robin scheduling of temporally decoupled clock objects with time quantum Q. 9, Clock0 has reached time 2Q while both Clock1 and Clock2 are still at time Q. As mentioned before, there is no single global time in the simulation; time always belongs to a clock, and different clocks can have different views of the time.
Thus, it is fair to call this an N IPS simulator regardless of the number of processors simulated. For clarity, the overall IPS might be called aggregate IPS, indicating the sum of progress on all processors in one host second. A domain-specific measurement like frames per second or packets per second might or might not reflect the effect of the round-robin simulation; it depends on the behavior and load balance of the software being run on the simulator. Slowdown tends to go up as more processors are simulated using a single host processor.
This is the same idea as the Linux kernel’s Kernel SamePage Merging (KSM), or VMware’s Transparent Page Sharing (TPS). Such pages are surprisingly common, in particular when simulating many instances of similar boards in networks. If more RAM is needed to represent the target state than is available, the Simics image system does its own swapping to disk, based on information available to the simulator about what is the best data to swap out. It also means that Simics can simulate system memory larger than the virtual memory of the host.