Discontinuity, Fiber, Flag, Glued, Last

This lesson introduces the following analysis patterns: discontinuity, fiber of activity, flag, glued activity, and last activity.


Sometimes we face delays in application startup and session initialization, long response times, and even the absence of response altogether. All these problems can be reflected in software traces showing sudden gaps in threads of activity. This pattern is called discontinuity from the analogy with continuous and discontinuous functions in mathematics. Here is an example: aprocess has a long period of CPU spiking calculation, and we record a trace. When we open it, we see this periodic error:

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