Archive for the ‘Software Prognostics’ Category

Trace Analysis Patterns (Part 99)

Saturday, January 24th, 2015

Sometimes specific parts of simultaneous Use Case Trails, blocks of Significant Events or Message Sets in general may overlap. This may point to possible synchronization problems such as race conditions (prognostics) or be visible root causes of them if such problems are reported (diagnostics). We call this pattern Activity Overlap:

For example, a first request may start a new session and we expect the second request to be processed by the same already established session:

However, users report the second session started upon the second request. If we filter execution log by session id and do Intra-Correlational analysis we find out that session initialization prologues are overlapped. The new session started because the first session initialization was not completed:

- Dmitry Vostokov @ DumpAnalysis.org + TraceAnalysis.org -