February 2026 monthly summary for OpenXiangShan/difftest: Focused on improving build system robustness under emulator failures during Profile-Guided Optimization (PGO). Implemented error handling to prevent build stoppages in Verilator and gsim configurations, ensuring continuous progress through PGO iterations and reducing maintenance effort.

January 2026 monthly summary for antmicro/verilator: Implemented NUMA-aware thread management to boost simulation performance on NUMA systems. Introduced VERILATOR_NUMA_STRATEGY environment variable to control NUMA assignment strategy for Verilator's thread pool, complementing automatic NUMA-based thread assignment. Added VerilatedContext::useNumaAssign and wired it into threads() calls to enable explicit NUMA-aware thread allocation. These changes enhance performance, scalability, and tunability for users running large-scale simulations.

December 2025 performance summary: Across OpenXiangShan/difftest, OpenXiangShan/NEMU, and antmicro/verilator, delivered cross-repo improvements that shorten iteration times, strengthen verification, and broaden toolchain compatibility. Key features include Verilator build performance and toolchain compatibility improvements using PGO_BOLT with appropriate linker choices (ld and bfd as needed) and standardized linker flags; UARTLite INPUT FIFO enabling direct character input to the UARTLite serial console. NEMU CI workflow enhancements introduced instruction-count based performance measurement, separated PR comment workflow for fork PRs, and artifact-based PR-number retrieval to improve feedback reliability. In Verilator-focused work, mux optimization for V3DfgPasses and configurable VerilatedContext thread count boost simulation throughput. Major bug fixes include correct -D argument parsing pattern to handle defines on the command line, and linker-related adjustments to ensure reliable PGO builds. Overall, these efforts accelerate development cycles, improve verification throughput, and broaden toolchain support while maintaining build correctness.

November 2025 performance-focused monthly summary across OpenXiangShan/XiangShan and OpenXiangShan/Utility. Core observability enhancements and a critical metric-update bug fix were delivered to enable more accurate benchmarking, reliable telemetry, and data-driven optimizations.

Month 2025-10 – OpenXiangShan/Utility: Key feature delivery and code quality improvements. Implemented ChiselTaggedTrace enhancements enabling micro-op tracing and speculative execution lifetime tracking; introduced InstSeqNum Bundle to consolidate instruction sequence number and uop index, with refactors to updateInstPos and updateInstMeta for maintainability. The changes support deeper performance analysis and correlation with PerfCCT. Commits included: c245b19f579ffbfe2ed9b658e993b5e2a397250a (feat: Support uop and speculative execution trace) and a6ca9ce4de61b6141912280516371936d54c47d0 (feat: Use InstSeqNum Bundle for PerfCCT).

September 2025 monthly summary for OpenXiangShan/XiangShan focusing on delivering alignment, debugging, and visualization hardening that drive reliability and faster performance diagnosis.

July 2025 focused on refining i386 PTA bitmask configuration in the rust-lang/gcc repository. Implemented missing bitmasks, fixed a potential typo, and clarified architecture definitions to improve build reliability and maintainability across multiple i386 targets.

June 2025 — OpenXiangShan/XiangShan-doc: Delivered targeted publications documentation update for 'Single-Address-Space FaaS with Jord', including authors, affiliations, and ISCA'25 venue. Patch linked to commit 856054e7ac5c8070663205aad6e5144915bde4f6. No major bugs fixed this month; maintenance focused on documentation hygiene and alignment with ISCA'25 timeline. Impact: improved knowledge base discoverability and external credibility; accelerates collaboration and onboarding. Skills: documentation standards, version control, and publications workflow.

Monthly work summary for 2024-12 focusing on documentation accuracy and technical quality in OI-wiki/OI-wiki.

Concise monthly summary for 2024-10 focusing on the zephyrproject-rtos/gcc repository. Delivered a critical AArch64 CPU features symbol lookup fix under LTO, resolving linker errors and stabilizing multiversioning for AArch64 under Link Time Optimization. This work improves build reliability and enables LTO-enabled optimizations in Zephyr's GCC toolchain.

May 2024 monthly summary for OpenXiangShan/riscv-isa-sim highlighting key features delivered, major fixes, impact, and tech skills demonstrated. Focuses on business value and concrete technical achievements.