OpenXiangShan/XiangShan
Mar 2026 – Jul 2026
4 Months active
Languages Used
Scala
Technical Skills
Scalafull stack developmentsystem architecturebackend developmenthardware designperformance optimization
Long Jiang
PROFILE
Long Jiang
Over four months, this developer contributed to OpenXiangShan/XiangShan by engineering performance and reliability improvements across the memory subsystem. They optimized cache and Sbuffer modules using Scala and Chisel, refining store-buffer and MissQueue logic to boost throughput and reduce cache traffic under dual-core workloads. Their work included parameter tuning, enhanced bank selection, and the introduction of CMO-aware Sbuffer flushing, which improved memory operation efficiency. They also addressed security by preventing DCache metadata leaks from exception-triggered loads and resolved eviction logic bugs. These efforts resulted in measurable SPEC06 score gains, greater timing headroom, and improved robustness for production-scale hardware architectures.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
7Total
Bugs
2
Commits
7
Features
4
Lines of code
425
Activity Months4
Your Network
62 peopleWork History
July 2026
3 Commits • 1 Features
Jul 1, 2026July 2026: Delivered targeted memory subsystem improvements and robustness enhancements in OpenXiangShan/XiangShan. Key focus areas included CMO-aware Sbuffer flushing to boost memory operation efficiency, and hardening the DCache and MSHR-related paths against leaks and erroneous eviction/replay conditions. These changes reduced latency for CMO paths, mitigated microarchitectural side-channel leakage from exception-triggered loads, and prevented false-positive errors during MSHR eviction replay, contributing to greater reliability and security across the memory hierarchy.
3 Commits • 1 Features
Jul 1, 2026July 2026: Delivered targeted memory subsystem improvements and robustness enhancements in OpenXiangShan/XiangShan. Key focus areas included CMO-aware Sbuffer flushing to boost memory operation efficiency, and hardening the DCache and MSHR-related paths against leaks and erroneous eviction/replay conditions. These changes reduced latency for CMO paths, mitigated microarchitectural side-channel leakage from exception-triggered loads, and prevented false-positive errors during MSHR eviction replay, contributing to greater reliability and security across the memory hierarchy.
July 2026
June 2026
1 Commits • 1 Features
Jun 1, 2026June 2026 summary for OpenXiangShan/XiangShan: Delivered Sbuffer performance enhancements and timing improvements, including ready signals for mergeable requests, improved bank selection logic, and registration of a coherence timeout mask to tighten timing margins. Refactored insertion logic for conciseness and better bank balancing. Achieved a SPEC06 1.0c score improvement of 0.08% (from 19.809 to 19.825). No major bugs fixed this month. Overall impact: higher Sbuffer throughput and timing headroom with cleaner, more maintainable code.
June 2026
1 Commits • 1 Features
Jun 1, 2026June 2026 summary for OpenXiangShan/XiangShan: Delivered Sbuffer performance enhancements and timing improvements, including ready signals for mergeable requests, improved bank selection logic, and registration of a coherence timeout mask to tighten timing margins. Refactored insertion logic for conciseness and better bank balancing. Achieved a SPEC06 1.0c score improvement of 0.08% (from 19.809 to 19.825). No major bugs fixed this month. Overall impact: higher Sbuffer throughput and timing headroom with cleaner, more maintainable code.
May 2026
2 Commits • 1 Features
May 1, 2026OpenXiangShan/XiangShan – May 2026: Cache subsystem performance optimizations and resilient refill path improvements to boost throughput, reduce cache traffic, and stabilize performance under dual-core workloads. Implemented store-buffer and MissQueue enhancements, refined MainPipe behavior during refills, and adjusted buffering thresholds. Delivered measurable SPEC06 1.0c score improvements and strengthened test stability.
2 Commits • 1 Features
May 1, 2026OpenXiangShan/XiangShan – May 2026: Cache subsystem performance optimizations and resilient refill path improvements to boost throughput, reduce cache traffic, and stabilize performance under dual-core workloads. Implemented store-buffer and MissQueue enhancements, refined MainPipe behavior during refills, and adjusted buffering thresholds. Delivered measurable SPEC06 1.0c score improvements and strengthened test stability.
May 2026
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026 – OpenXiangShan/XiangShan: Focused on performance and configuration optimization through targeted submodule upgrades and parameter tuning, delivering improvements in configurability and efficiency. This work enhances readiness for production workloads and supports faster iteration cycles.
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026 – OpenXiangShan/XiangShan: Focused on performance and configuration optimization through targeted submodule upgrades and parameter tuning, delivering improvements in configurability and efficiency. This work enhances readiness for production workloads and supports faster iteration cycles.
Activity
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Quality Metrics
Correctness85.6%
Maintainability82.8%
Architecture82.8%
Performance88.6%
AI Usage51.4%
Skills & Technologies
Programming Languages
Scala
Technical Skills
Cache DesignChiselComputer ArchitectureHardware ArchitectureHardware DescriptionMemory Subsystem DesignPerformance OptimizationScalaSecurity Engineeringbackend developmentfull stack developmenthardware designperformance optimizationsystem architecture
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