xupefei/spark
Jan 2025 – Jan 2025
1 Month active
Languages Used
Java
Technical Skills
Java programmingalgorithm designperformance optimization
Yibo Cai
PROFILE
Yibo Cai
During a three-month period, Cyb70289 focused on reliability, performance, and cross-platform compatibility across multiple open-source repositories. In xupefei/spark, he improved array comparison correctness and throughput by refining the arrayEquals implementation in Java, addressing edge cases with large arrays. For ggml-org/llama.cpp, he optimized the Q6_K_Q8_K kernel for ARM64 using i8mm, leveraging low-level C++ and quantization techniques to deliver faster inference without loss of accuracy. In apache/arrow, he enhanced platform stability by updating CMake build configurations to ensure mimalloc produced Armv8.0-compatible binaries, preventing crashes on devices like Raspberry Pi 4 and broadening hardware support.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
3Total
Bugs
2
Commits
3
Features
1
Lines of code
203
Activity Months3
Your Network
560 peopleWork History
October 2025
1 Commits
Oct 1, 2025October 2025 (2025-10) monthly summary for Apache Arrow focused on platform stability and ARM compatibility. The main effort this month was to harden Armv8.0 support by ensuring mimalloc generates armv8.0-compatible binaries, eliminating crashes on Armv8.0 platforms without introducing user-facing changes. This work was implemented via a targeted build-system change in ThirdpartyToolchain.cmake.
1 Commits
Oct 1, 2025October 2025 (2025-10) monthly summary for Apache Arrow focused on platform stability and ARM compatibility. The main effort this month was to harden Armv8.0 support by ensuring mimalloc generates armv8.0-compatible binaries, eliminating crashes on Armv8.0 platforms without introducing user-facing changes. This work was implemented via a targeted build-system change in ThirdpartyToolchain.cmake.
October 2025
May 2025
1 Commits • 1 Features
May 1, 2025Monthly summary for 2025-05 focusing on developer work in ggml-org/llama.cpp. Delivered a performance optimization for ARM64 using i8mm in the Q6_K_Q8_K kernel, achieving significant speedups across various batch sizes while preserving perplexity. No major bug fixes reported this month.
May 2025
1 Commits • 1 Features
May 1, 2025Monthly summary for 2025-05 focusing on developer work in ggml-org/llama.cpp. Delivered a performance optimization for ARM64 using i8mm in the Q6_K_Q8_K kernel, achieving significant speedups across various batch sizes while preserving perplexity. No major bug fixes reported this month.
January 2025
1 Commits
Jan 1, 2025Month: 2025-01 — Focused on reliability and performance improvements in core array handling within the xupefei/spark repository. Delivered a targeted bug fix for arrayEquals that enhances correctness for large arrays and improves throughput for array comparisons, aligned with SPARK-51001.
1 Commits
Jan 1, 2025Month: 2025-01 — Focused on reliability and performance improvements in core array handling within the xupefei/spark repository. Delivered a targeted bug fix for arrayEquals that enhances correctness for large arrays and improves throughput for array comparisons, aligned with SPARK-51001.
January 2025
Activity
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Quality Metrics
Correctness100.0%
Maintainability93.4%
Architecture100.0%
Performance100.0%
AI Usage40.0%
Skills & Technologies
Programming Languages
CC++CMakeJava
Technical Skills
ARM architectureBuild System ConfigurationC++ DevelopmentCross-Platform CompatibilityJava programmingalgorithm designlow-level optimizationperformance optimizationperformance tuningquantization
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline
ggml-org/llama.cpp
May 2025 – May 2025
1 Month active
Languages Used
CC++
Technical Skills
ARM architecturelow-level optimizationperformance tuningquantization
apache/arrow
Oct 2025 – Oct 2025
1 Month active
Languages Used
C++CMake
Technical Skills
Build System ConfigurationC++ DevelopmentCross-Platform Compatibility