Juncheng Yang https://blog.jasony.me/ Notes on storage and machine-learning systems by Juncheng Yang — caching, systems research, and advising. en Your LRU cache is working too hard https://blog.jasony.me/posts/2026-07-23-lazy-promotion-cache-eviction.html https://blog.jasony.me/posts/2026-07-23-lazy-promotion-cache-eviction.html Thu, 23 Jul 2026 12:00:00 GMT Research Across 6,357 production traces, most LRU promotions did little useful work. Delaying the decision made caches faster without making them less effective. Authorship inflation at OSDI: counting papers two ways https://blog.jasony.me/posts/2026-07-10-osdi-authorship-inflation.html https://blog.jasony.me/posts/2026-07-10-osdi-authorship-inflation.html Fri, 10 Jul 2026 12:00:00 GMT Academia OSDI author lists have more than doubled since 1994. Whether the field's most prolific authors are actually publishing more depends on whether a paper counts as one, or as one divided by its author count. Make model precision elastic https://blog.jasony.me/posts/2026-05-24-make-model-precision-elastic.html https://blog.jasony.me/posts/2026-05-24-make-model-precision-elastic.html Sun, 24 May 2026 12:00:00 GMT Systems MorphServe temporarily converts selected model layers into KV-cache headroom when traffic spikes, then restores full precision when the pressure passes. Why FIFO is (almost) all you need for cache eviction https://blog.jasony.me/posts/2026-05-20-fifo-is-all-you-need.html https://blog.jasony.me/posts/2026-05-20-fifo-is-all-you-need.html Wed, 20 May 2026 12:00:00 GMT Research A simple first-in-first-out queue, given one quick second chance, beats far more complex eviction policies on real workloads. Here is the intuition behind S3-FIFO and SIEVE. Measurement-first systems research https://blog.jasony.me/posts/2026-04-08-measurement-first-systems-research.html https://blog.jasony.me/posts/2026-04-08-measurement-first-systems-research.html Wed, 08 Apr 2026 12:00:00 GMT Research The most useful systems I have built started not with a design, but with a long, uncomfortable look at how the existing system actually behaved in production. Advice for prospective systems PhD students https://blog.jasony.me/posts/2026-03-02-advice-for-prospective-students.html https://blog.jasony.me/posts/2026-03-02-advice-for-prospective-students.html Mon, 02 Mar 2026 12:00:00 GMT Academia I am recruiting students who want to build real systems for storage, databases, and machine learning. Here is how I think about the work and what I look for.