Hierarchical IO Trace Analysis for Storage Latency
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Solution Overview
Problem
Conventional approaches to analyzing IO requests in storage systems fail to accurately determine latency and other performance metrics due to their inability to account for hierarchical execution flows and the interleaving of IO traces, making it difficult to analyze the execution cost of complex IO flows.
Innovation Solution
The method involves defining vertical and horizontal flows for IO traces, associating unique identifiers with parent and child requests, and generating a hierarchical representation of IO traces to accurately calculate execution latency, thereby reformulating the sequential execution representation into a hierarchical one.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sequential listing approaches are used to represent IO traces, then the representation is simple and easy to generate, but it becomes difficult to determine accurate latency and performance metrics for complex IO flows with hundreds of thousands of interleaved traces
Solution Approach 1:
The patent segments the flat sequential IO trace list into hierarchical groups using parent-child relationships. Each IO request is divided into parent requests and their corresponding child sub-requests, creating a structured representation that enables accurate latency measurement by associating timestamps with specific hierarchical levels rather than treating all traces as a flat sequence.
Solution Approach 2:
The patent adds a hierarchical dimension to the traditionally flat sequential representation of IO traces. By introducing parent-child relationships and grouping traces into hierarchical levels, the system transforms the one-dimensional sequential list into a multi-dimensional hierarchical structure, enabling accurate performance metric determination for complex nested IO flows.
2Loss of information
If all IO traces are captured and analyzed in detail, then complete performance visibility is achieved, but the analysis becomes computationally expensive and difficult to manage with hundreds of thousands of traces
Solution Approach 1:
The patent segments the massive set of IO traces into manageable hierarchical groups using parent-child relationships. This segmentation allows the system to analyze performance metrics at different levels of the hierarchy, aggregating data from child traces to parent traces, thereby maintaining complete performance visibility while reducing the computational burden of analyzing hundreds of thousands of individual traces separately.
Solution Approach 2:
The patent merges individual child IO trace data into parent IO request groups, combining performance metrics from multiple child traces at the same hierarchical level. This merging process reduces the overall complexity by aggregating data, allowing comprehensive performance analysis without requiring separate processing of every individual trace.
3Measurement precision
If hierarchical representation with parent-child relationships is implemented, then accurate latency determination is achieved, but additional processing overhead is introduced for associating unique identifiers and generating hierarchical structures
Solution Approach 1:
The patent applies preliminary action by assigning unique parent and child identifiers to IO requests as they are generated, before the actual IO operations complete. This pre-establishment of hierarchical relationships and identifiers enables efficient subsequent processing and accurate latency determination without requiring complex post-processing, thereby reducing overall processing time while maintaining measurement precision.
Data Source
AI summary
A method, computer program product, and computing system for executing a plurality of IO traces on a storage system. At least one vertical flow and at least one horizontal flow associated with the at least one vertical flow may be defined for the plurality of IO traces. A hierarchical representation of the plurality of IO traces may be generated with the at least one vertical flow and the at least one horizontal flow associated with the at least one vertical flow defined for the plurality of IO traces.