OpenXiangShan/XiangShan
Jan 2025 – Mar 2025
2 Months active
Languages Used
MakefileScala
Technical Skills
Cache Coherence ProtocolsCode Ownership ManagementHardware DesignSubmodule ManagementSystem ArchitectureCPU Architecture
Zifei Zhang
PROFILE
Zifei Zhang
Worked on the OpenXiangShan/XiangShan repository to enhance system maintainability and performance through targeted governance and hardware improvements. Updated code ownership management for the MMU module, streamlining review processes and clarifying accountability. Upgraded cache subsystem submodules using Scala and Makefile, enabling advanced features such as CHI Issue C support, DataCheck, and Poison, which improved data integrity and cache robustness. Addressed a pipeline stall issue by refining instruction fusion logic, ensuring fused instructions are correctly treated as NoStall to reduce unnecessary stalls and improve throughput. Demonstrated depth in CPU architecture, cache coherence protocols, and pipeline optimization throughout the development cycle.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
3Total
Bugs
1
Commits
3
Features
2
Lines of code
158
Activity Months2
Your Network
63 peopleSame Organization
@mails.ucas.edu.cn2
Work History
March 2025
1 Commits
Mar 1, 2025Concise monthly summary for 2025-03 focusing on the OpenXiangShan/XiangShan repository. Delivered a targeted pipeline crash/stall fix to improve throughput and reliability in the critical instruction fetch/decode path. The fix ensures fused instructions are treated as NoStall, aligning stall reasoning with actual runtime behavior and reducing unnecessary stalls in the pipeline.
1 Commits
Mar 1, 2025Concise monthly summary for 2025-03 focusing on the OpenXiangShan/XiangShan repository. Delivered a targeted pipeline crash/stall fix to improve throughput and reliability in the critical instruction fetch/decode path. The fix ensures fused instructions are treated as NoStall, aligning stall reasoning with actual runtime behavior and reducing unnecessary stalls in the pipeline.
March 2025
January 2025
2 Commits • 2 Features
Jan 1, 2025Month: 2025-01. Focus: governance and performance improvements in OpenXiangShan/XiangShan. Primary deliverables this month were governance and cache subsystem upgrades that drive maintainability and reliability. Business value: clearer ownership accelerates code reviews and reduces review friction; submodule upgrades unlock advanced cache features and robustness for the memory subsystem, improving overall system stability and performance.
January 2025
2 Commits • 2 Features
Jan 1, 2025Month: 2025-01. Focus: governance and performance improvements in OpenXiangShan/XiangShan. Primary deliverables this month were governance and cache subsystem upgrades that drive maintainability and reliability. Business value: clearer ownership accelerates code reviews and reduces review friction; submodule upgrades unlock advanced cache features and robustness for the memory subsystem, improving overall system stability and performance.
Activity
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Quality Metrics
Correctness93.4%
Maintainability86.6%
Architecture86.6%
Performance86.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
MakefileScala
Technical Skills
CPU ArchitectureCache Coherence ProtocolsCode Ownership ManagementHardware DesignPipeline OptimizationSubmodule ManagementSystem Architecture
Repositories Contributed To
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