Using Event Trace To Analyze Real-Time System Behavior and Increase Throughput

This White Paper is presented by Express Logic

Assigning multiple threads the same priority can have many beneficial effects and can help system designers avoid traps that threaten the proper operation of their real-time system. It is important that the developer understand the restrictions of RTOSes that do not enable the assignment of multiple threads to the same priority, and to make the RTOS selection with this in mind.

Real-time software applications consist of multiple tasks or threads, each performing a portion of the system’s workload under the management of a real-time operating system (RTOS). In a real-time system, a thread’s priority reflects the relative urgency of its work, and RTOSes strive at all times to run the most urgent work that needs to be performed. A preemptive scheduling RTOS will always run the highest priority thread that is ready to run. But, the ultimate goal of many real-time systems is throughput – the more packets processed, bytes streamed, frames rendered per second, the better. Sometimes, real-time responsiveness can actually add overhead, and reduce the system’s performance. In those instances, there is a tradeoff between responsiveness and throughput. One example of such a tradeoff occurs when a system uses unique priorities in an attempt to achieve low latency, but suffers increased overhead and reduced throughput as a result. The assignment of unique priorities to all application threads is effective in minimizing latency of individual threads, and might be an appropriate for some applications. However, many times the system can achieve greater throughput by using a different approach to priority assignment that does not require each thread to have a unique priority...

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