OpenXiangShan/GEM5
Jan 2025 – Dec 2025
5 Months active
Languages Used
C++PythonShell
Technical Skills
CPU SimulationDebuggingEmbedded SystemsEmbedded systemsHardware SimulationLow-level Programming
jueshiwenli
PROFILE
Jueshiwenli
Worked on the OpenXiangShan/GEM5 repository, focusing on RISC-V CPU simulation, memory management, and system architecture. Over five months, delivered features and fixes that improved RTL simulation fidelity, enhanced memory subsystem calibration, and increased virtualization reliability. Used C++ and Python to implement dynamic MMU/TLB sizing, refine pagetable walker correctness, and optimize cache prefetching through L1 miss trace calibration. Addressed edge-case failures in virtualized environments by stabilizing vsstatus handling and introduced new CI configurations for checkpoint testing. The work emphasized low-level programming, debugging, and performance optimization, resulting in more accurate simulations and streamlined development workflows for hardware modeling.
Overall Statistics
Feature vs Bugs
44%Features
Repository Contributions
20Total
Bugs
5
Commits
20
Features
4
Lines of code
566
Activity Months5
Your Network
27 peopleShared Repositories
27
Work History
December 2025
2 Commits • 1 Features
Dec 1, 2025Monthly performance summary for 2025-12: Focused on memory subsystem tuning in OpenXiangShan/GEM5, delivering calibration enhancements for memory prefetchers and stride-based prefetching using L1 miss trace data. The work improves cache prefetching efficiency and memory management performance, with traceable changes via commit metadata. No major bug fixes documented this month; emphasis was on feature-level calibrations with measurable impact on throughput and latency.
2 Commits • 1 Features
Dec 1, 2025Monthly performance summary for 2025-12: Focused on memory subsystem tuning in OpenXiangShan/GEM5, delivering calibration enhancements for memory prefetchers and stride-based prefetching using L1 miss trace data. The work improves cache prefetching efficiency and memory management performance, with traceable changes via commit metadata. No major bug fixes documented this month; emphasis was on feature-level calibrations with measurable impact on throughput and latency.
December 2025
May 2025
2 Commits • 1 Features
May 1, 20252025-05 monthly summary focusing on key accomplishments for GEM5 (OpenXiangShan). The period delivered improvements to test coverage and core status handling, enhancing reliability and feedback loops for hardware modeling. Key changes include a new H Checkpoints CI Testing configuration and a bug fix for the RISC-V vsstatus register; together these efforts strengthen validation, reduce risk of regressions, and streamline development workflows.
May 2025
2 Commits • 1 Features
May 1, 20252025-05 monthly summary focusing on key accomplishments for GEM5 (OpenXiangShan). The period delivered improvements to test coverage and core status handling, enhancing reliability and feedback loops for hardware modeling. Key changes include a new H Checkpoints CI Testing configuration and a bug fix for the RISC-V vsstatus register; together these efforts strengthen validation, reduce risk of regressions, and streamline development workflows.
April 2025
9 Commits
Apr 1, 2025Monthly summary for 2025-04: Key focus on RISC-V memory management correctness and virtualization reliability in GEM5/OpenXiangShan. Delivered a comprehensive set of MMU/TLB fixes and virtualization status improvements, accompanied by an MMU configurability option to control L2→L1 refill behavior. These changes enhance correctness, predictability, and platform readiness for production workloads by stabilizing memory isolation, TLB behavior, and vsstatus handling in virtualized environments.
9 Commits
Apr 1, 2025Monthly summary for 2025-04: Key focus on RISC-V memory management correctness and virtualization reliability in GEM5/OpenXiangShan. Delivered a comprehensive set of MMU/TLB fixes and virtualization status improvements, accompanied by an MMU configurability option to control L2→L1 refill behavior. These changes enhance correctness, predictability, and platform readiness for production workloads by stabilizing memory isolation, TLB behavior, and vsstatus handling in virtualized environments.
April 2025
March 2025
3 Commits
Mar 1, 2025March 2025 monthly summary for OpenXiangShan/GEM5: Focused on RISC-V simulator correctness. Delivered critical bug fixes across status/VSSTATUS handling, CSR masks, and memory management, with improvements to VSSTATUS dirty flags, h-extension CSR masks, and L2 TLB hit handling in the pagetable walker. These changes reduce simulation edge-case failures and increase reliability for kernel and user-space software testing, contributing to more accurate performance modeling and debugging.
March 2025
3 Commits
Mar 1, 2025March 2025 monthly summary for OpenXiangShan/GEM5: Focused on RISC-V simulator correctness. Delivered critical bug fixes across status/VSSTATUS handling, CSR masks, and memory management, with improvements to VSSTATUS dirty flags, h-extension CSR masks, and L2 TLB hit handling in the pagetable walker. These changes reduce simulation edge-case failures and increase reliability for kernel and user-space software testing, contributing to more accurate performance modeling and debugging.
January 2025
4 Commits • 2 Features
Jan 1, 2025January 2025 performance summary for OpenXiangShan/GEM5. Focused on RTL fidelity, correctness, and developer productivity. Key deliverables include RISC-V MMU/TLB sizing alignment and dynamic masks for xs-RTL, a correctness fix for the RISC-V pagetable walker, and an improvement to O3 CPU store misaligned warning logging via DPRINTF-based conditional logging. These changes improve RTL simulation accuracy, ensure correct virtual-to-physical translations, and reduce log noise in common error paths, contributing to more reliable simulations and faster debugging.
4 Commits • 2 Features
Jan 1, 2025January 2025 performance summary for OpenXiangShan/GEM5. Focused on RTL fidelity, correctness, and developer productivity. Key deliverables include RISC-V MMU/TLB sizing alignment and dynamic masks for xs-RTL, a correctness fix for the RISC-V pagetable walker, and an improvement to O3 CPU store misaligned warning logging via DPRINTF-based conditional logging. These changes improve RTL simulation accuracy, ensure correct virtual-to-physical translations, and reduce log noise in common error paths, contributing to more reliable simulations and faster debugging.
January 2025
Activity
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Quality Metrics
Correctness82.0%
Maintainability80.0%
Architecture78.0%
Performance68.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++PythonShell
Technical Skills
C++ programmingCI/CDCPU ArchitectureCPU SimulationCPU architectureCheckpointingConfiguration ManagementDebuggingEmbedded SystemsEmbedded systemsHardware SimulationLow-Level ProgrammingLow-level ProgrammingLow-level Systems ProgrammingLow-level programming
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