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Fair point, though I'm not sure I agree. MPMC channels underpin pretty much every general task scheduler (take a peek inside tokio or rayon for example). And SPSCs are quite useful…

As noted by other commenters, the point I was trying to get across is that the way we implement lockless channels is suboptimal and could be made faster from a theoretical standpoi…

Thanks for sharing, I had not! It sounds like "processor sharing" would be the expected mode of operation for lockless queues. But see my comment to the parent, this is not how the…

This is actually a great analogy because it exemplifies the misconceptions people have about lockless queues. In the example with multiple counters, in real life each counter could…

So you have to use probabilistic methods, makes sense thanks!

Thanks for the links!

I'm wondering if I can have a client build some artifact and upload the artifact to a cache server that redistributes it. Of course the problem is that a malicious client could upl…

This is incredibly over-engineered, but it was quite a fun process. :)

I made something similar a while back where you can set your own start and end time for the "day": https://alexsaveau.dev/10hrday The point was to be able to divide the day into ni…

https://alexsaveau.dev/blog Mostly about performance and project internals.

Except they are and your claims are trivial to disprove: simply run the benchmarks under perf. You'll find that most of the time is spent on the rwsem which is described here onwar…

No. Run the benchmark on a tmpfs: $ hyperfine --warmup 3 -N "./test /dev/shm 8 zip" "./test /dev/shm 8 chain" Benchmark 1: ./test /dev/shm 8 zip Time (mean ± σ): 118.5 ms ± 11.6 ms…

> is disk IO bottlenecked by NVMe/PCIe limits, or by disk iops limits? Note that I'm out of my depth here, so this is all speculation. Until we hit hardware limitations (which will…

A directory is a file like anything else that contains a map of names to inodes. If you're trying to add or remove mappings (create or delete files), then clearly some synchronizat…

Added a small clarification: "The intuition here is that directories are a shared resource for their direct children and must therefore serialize concurrent directory-modifying ope…

We're working on this! https://github.com/axboe/liburing/issues/830

I added a clarification to the benchmarks section: "The macOS/Windows implementations are currently equivalent to the *_rayon implementations shown in the benchmarks." Rayon is pre…

We're building a small game that runs on the web: https://supercilex.github.io/grocery_bagger_9000/

Ok, based on this response and others it seems like this might be something on my end... I'll look into getting a bug report to support.

That looks cool (especially sponsorblock), thanks for the tip!