When debugging or otherwise understanding software, developers frequently ask questions such as “how did this function get called?” and “where did this value come from?”. Runtime data is a valuable yet underused resource for answering these questions. There are at least four major barriers to answering questions with runtime data: 1) Deciding what runtime data should be collected 2) Deciding how to collect relevant runtime data 3) Aggregating and summarizing collected data 4) Interpreting the results to make conclusions.
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