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[Magazine] Embedded Computing Design. 2007. Number 2 (March)

Embedded Computing layout is your source for the newest information, engineering tools, items, and instruments worthy for layout of small embedded modules in your dispensed, large-scale embedded structures.

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Using AMP or SMP solutions Asymmetric MultiProcessing (AMP) and Symmetric MultiProcessing (SMP) are terms used to describe a Real-Time Operating System (RTOS) and hardware architecture of the device. Many detailed papers and books have been written on the subjects of AMP and SMP, so for the purposes of this discussion, analysis will focus on the high-level advantages and disadvantages of each system in a multicore environment and why the need for a simple communication scheme exists no matter which architecture is used.

In the not too distant future, a group of general-purpose cores will be able to replace a single general-purpose core, and a group of DSP cores will be able to replace a single specialized DSP core. Each group will have an SMP RTOS, but the two groups will still need to communicate with each other just as AMP systems do today. For current situations, it appears an AMP system is optimal, but whether it or an SMP system is used, a communication method between heterogeneous groups will be needed, as depicted in Figure 2.

Molnar, the most experienced real-time community member, rewrote/created and maintained all real-time Linux features in the newly formed real-time Linux branch that evolved from Voluntary Preempt. Molnar’s involvement played a vital role in getting Linux real time to the point it’s at today. This flurry of activity endowed the real-time Linux branch with preemption rates that approach the hardware context switching cost. The Linux real-time kernel uses the following key features: n Priority Inheriting Mutex: A mutual Figure 1 © 2007 OpenSystems Publishing exclusion object (mutex) allowing the highest priority of all the waiters on a Not for distribution The days of Linux considered as only a general-purpose OS are ending.

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