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Overview
Hello there! I'm Ping-Lin Chang (張秉霖), and friends call me Pinglin.
News
The Cluster You Do Not Watch
I almost never open Grafana any more. This is the operations architecture that made that true, on under US$10 a month of infrastructure - an agent that reads everything and writes nothing directly, alerts precise enough to act on, repairs that must prove
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The Shapes of Agent Memory - Files, Stores, and Experience
An agent that remembers across sessions can keep its memory as curated markdown files, as an auto-mined structured store, or as trained experience. I measured all of them: files against a structured store under one fixed model, a store-only head-to-head a
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Why Steering Works - The Theory Beneath X Engineering for AI Agents
An agent run is stochastic gradient descent over solution space, and steering is how the true objective enters the loop. An optimization view and a Bayesian view that ground the industry ladder - prompt, context, harness, loop engineering - in foundation
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Optimizing Transformer Model Serving Parameters - An Apple Silicon GPU Case Study
One MacBook Pro M4 Max, an open-source MoE, and a hands-on exercise in optimizing it for inference: why the thing that collapses LLM throughput by 100 is prefill, not decode, and the two prefill-side fixes that got it back.
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Collection Autofill at Scale
A design walkthrough of how Collection Autofill - a spreadsheet of AI-computed cells - stays fast, fair, and observable from a hundred rows to ten million.
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