Computers as Components, 2nd Edition

4.7 System-Level Performance Analysis 189

The exact results of missing real-time deadlines depend on the detailed character-

istics of the I/O devices and the nature of the timing violation.This makes debugging

real-time problems especially difficult. Unfortunately, the best advice is that if a

system exhibits truly u nusual behavior, missed deadlines should be suspected.

In-circuit emulators, logic analyzers, and even LEDs can be useful tools in check-

ing the execution time of real-time code to determine whether it in fact meets its

deadline.

4.7 SYSTEM-LEVEL PERFORMANCE ANALYSIS

Bus-based systems add another layer of complication to performance analysis. ...