Engineering Notes on Systems, Performance, AI, and DSA | /tmp

AI Notes

Vibe-Coded, Not Vibe-Validated

AI Wrote Everything Except This

Project Lessons

Semantic Image Search From Embeddings To Ranked Results

ClusterLens Algorithms: PCA, KMeans, FAISS, HDBSCAN, And Graphs

Perceptual Hashing And Duplicate Review

ClusterLens UI Runtime: Virtualized PyQt, Workers, And Generated State

Neural Network Tutor: Replay, Gradients, And Ablation

Desktop Local App Lessons

Performance Notes

inih Optimization: Simpler Scans Beat Fancy Tricks

zlob Optimization: Faster In-Memory Glob Matching Without More Layers

miniz Optimization: Checksums Win Before the Codec Does

Clean Code Tax, Measured

ClamAV SIMD Fast Paths For Parser-Heavy Scanning

Speeding Up pdftotext When You Only Want The Text

Cache-SIMD-DSA

ORB Python-To-Rust Speedup Record

Cache Lines Before Big-O: Optimizing Search Algorithms by Changing Memory Access

Computer Internals Notes

Linux I/O Path: From write() to NVMe Doorbell

Mutex Internals: From Cache Lines to Futex Wait Queues

Packet Flow: NIC, DMA, Rings, Kernel, XDP, and DPDK

What Does Clearing .bss Mean in Early Kernel Boot?

Booting, My Confusions and ChatGPT

Hardware Memory Path: From Virtual Address to DRAM, MMIO, and DMA

SIMD Mapping: From Normal Code to Vector Code

Interview Notes

C Interview Notes

C++ Interview Notes

System Design Interview Notes

DSA Notes

State Space Exploration Superset Professional Playbook

System Design Notes

System Design: Three Constraints