Crash Dump Analysis Patterns (Part 204)

One of useful patterns for the analysis of system hangs is Thread Waiting Time. If there are many such threads of interest they can be partitioned by waiting time and modules of interest from their stack traces. Modules of interest may include Directing, Coupled, Blocking, Top, and/or Problem modules depending on the problem description. We call the resulting composite pattern Thread Cluster. Extra-dimensional information can also be added such as the number of threads having the same or similar waiting time and other attributes by using different colours. For example, on this diagram, illustrating a real system hang, we see clustering of threads running through one 3rd-party module of interest and having the longest waiting time. Also we are able to identify possibly coupled (semantically related) threads running through another module of interest:

- Dmitry Vostokov @ + -

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