Understanding the behavior of complex Java programs requires a balance of detail and volume. For example, a transaction server may perform poorly because it is not always precompiling a database query. Establishing this piece of information requires a relatively fine level of detail: e.g., the sequence, context, and duration of individual method invocations. To collect this detail, a detailed trace of the program can be generated. Unfortunately, recording detailed execution traces quickly becomes infeasible, due to both time perturbations and space overheads - infeasible for even reasonably complex programs.
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