AK-1 · application
Systems
4 notes in this application.
| AN | Date | Change | Category | min |
|---|---|---|---|---|
| 008 | I Set Out to Learn NRVO and Ended Up Measuring My Command Line I wanted to understand named return value optimisation, got curious what the pessimised version costs, and my first numbers were reproducible to 0.01% and wrong. Instructions and cycles instead of wall-clock, and the pointer question turned out to be an allocator question. | systems | 11 | |
| 007 | How I Benchmark on the GB10 CPU The same benchmark landed at 3.47 ms and 7.01 ms on different afternoons while reporting under 0.3% variation both times. These are the habits that survived that. | systems | 11 | |
| 006 | NVLink-C2C Removes the Copy, Not the Synchronization The CUDA Programming Guide assumes the host and the device keep separate memories with a copy between them. My DGX Spark doesn't. So I went and learned what NVLink-C2C actually is compared to PCIe, how coherence behaves across it, and what that changes for someone writing C++ on this machine. | systems | 13 | |
| 005 | CUDA Performance, Part 1: Device Busy Is Not GPU Busy A program can report 98.8% device utilization while leaving its compute units idle 39% of the time. This is what I learned building a TUI for nsys timelines, and why the second number is the only one that matters. | systems | 11 |