
During November 2025, Andres Perdomo developed and integrated an Adaptive Replacement Cache (ARC) eviction policy for the CPU offloader in the IBM/vllm repository. He designed the ARC policy to balance recency and frequency, improving cache management and reducing cache misses during large language model inference. Working primarily in Python, Andres implemented the policy within the existing key-value cache structures and ensured seamless integration with the production offloading workflow. He also created comprehensive tests to validate ARC behavior, supporting reliability and maintainability. This work demonstrated depth in backend development, cache management, and test-driven engineering for high-performance inference systems.

February? No, month is 2025-11 per input. This monthly summary covers IBM/vllm work for 2025-11. Key focus: a single feature delivery for ARC eviction policy in the CPU offloader, with tests and integration into the offloading stack. Key features delivered: - Adaptive Replacement Cache (ARC) eviction policy integration for the CPU offloader in vLLM. This balances recency and frequency to improve cache management and CPU offloading performance under varying workloads. Implemented as part of the CPU offloading manager and aligned with existing cache KV structures. Major bugs fixed: - No major bugs reported for IBM/vllm in this period based on available data. The work included tests to validate ARC eviction behavior, helping prevent regressions. Overall impact and accomplishments: - Improved cache efficiency and predictability of CPU offloading, reducing cache misses and improving throughput for large language model inference workloads. - Demonstrated end-to-end capability to introduce cache eviction policies in a high-performance offloader, with tests and production-ready integration. Technologies/skills demonstrated: - Cache eviction policy design (ARC) and integration with CPU offloading workflow - KV cache eviction policy implementation and testing - Git-based change management and traceability (commit bac904565f170ba198c2398a0f627b38f9cb8e18, PR reference #27039) - Test-driven validation of new eviction policy
February? No, month is 2025-11 per input. This monthly summary covers IBM/vllm work for 2025-11. Key focus: a single feature delivery for ARC eviction policy in the CPU offloader, with tests and integration into the offloading stack. Key features delivered: - Adaptive Replacement Cache (ARC) eviction policy integration for the CPU offloader in vLLM. This balances recency and frequency to improve cache management and CPU offloading performance under varying workloads. Implemented as part of the CPU offloading manager and aligned with existing cache KV structures. Major bugs fixed: - No major bugs reported for IBM/vllm in this period based on available data. The work included tests to validate ARC eviction behavior, helping prevent regressions. Overall impact and accomplishments: - Improved cache efficiency and predictability of CPU offloading, reducing cache misses and improving throughput for large language model inference workloads. - Demonstrated end-to-end capability to introduce cache eviction policies in a high-performance offloader, with tests and production-ready integration. Technologies/skills demonstrated: - Cache eviction policy design (ARC) and integration with CPU offloading workflow - KV cache eviction policy implementation and testing - Git-based change management and traceability (commit bac904565f170ba198c2398a0f627b38f9cb8e18, PR reference #27039) - Test-driven validation of new eviction policy
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