Top all-time · #11898
Jim Cownie
Personal blog · cpufun.substack.comprogrammingsystemshardware
Jim Cownie writes CPU fun, a personal blog at cpufun.substack.com about programming, systems and hardware. Since 2021, 6 different Hacker News readers have linked it 8 times, most often “Atomics in AArch64”. It is still writing: the last post was on 2025-03-18, and you can follow it by feed.
Too few sampled comments (1) to say how often HN recommends it.?
Why HN links it
One comment cites a section of the post on notable differences in cache lines, noting Apple M-series chips use 128-byte lines while ARM does not mandate one. The posts cover CPU cache-friendly data structures in Go.
Summarised by Claude from a sample of 1 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
Random CPU related notes from a parallel runtime library writer.
Most-linked posts?
- Atomics in AArch642 people · 2 mentions · first linked 2021-05-14
- Is Fortran “A Dead Language”? (2022)2 people · 2 mentions · first linked 2024-01-11
What Hacker News says?
https://news.ycombinator.com/item?id=45529810 https://cpufun.substack.com/i/32474663/notable-differences As noted by the other comments, Apple's M-series chips seem to use a 128-byte cache line. ARM doesn't mandate that their licensees must use a pre-specified cache line size: 64 bytes just happens to be the consensus-arrived standard.
Comment linking /i/32474663/notable-differences
on “CPU cache-friendly data structures in Go”Submitted Is Fortran “A Dead Language”? (2022) as a story · 126 points
HN discussionSubmitted Fun with Timers and Cpuid as a story · 70 points
HN discussionSubmitted Atomics in AArch64 as a story · 64 points
HN discussionSubmitted Where's the Race Condition? “works on AArch64, how can it fail on x86_64?” as a story · 21 points
HN discussionSubmitted Fortran Is Alive and Well as a story · 2 points
HN discussionSubmitted Fun with Timers and Cpuid as a story · 2 points
HN discussionSubmitted Atomics in AArch64 as a story · 1 points
HN discussion
