A system includes tracing logic to parse trace information into time varying segments and model traces based on segments of time varying I/O (input/output) and/or workload behavior. The logic can detect segments that represent statistically similar system behavior and reduce the number of segments based on detecting segments representing similar system behavior. The logic can leverage Mutual Information techniques to eliminate redundant workload dimensions and build a concise workload model. The logic can also use HAC to segregate similar workload patterns represented by multiple non-redundant workload attributes. The logic can use ePDF to regenerate distributions of workload attribute values during trace regeneration. The logic can generate segment models from the segments, which can be combined into a test trace that represents a period of system behavior for simulation. The logic can allow combining the segment models in different patterns to simulate behavior not observed in the original trace information.
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