Instruments – Wade Tregaskis

-fomit-frame-pointer

January 25, 2024January 24, 2024 by

Explanatory diagram of frame pointers, showing a link from the x86-64 register %rbp to the start of the current frame, which holds the prior value of %rbp that points to the top of the previous frame, and so on.

This is an elaboration of a post I made in a Swift Forums thread, SE-0419: Swift Backtracing API. The question was raised whether an official Swift backtracer should try to support code that doesn’t use frame pointers. Which immediately raised the question – in my mind – of if anyone is still using the “optimisation”… Read more

I was into io_uring before it existed

January 17, 2024 by

I just read up a bit on io_uring, prompted by a Swift Forums thread relating to it, and it made me laugh. To a lot of people it’s an amazing new[ish] high-performance I/O system for Linux. Which it is (albeit with some serious security concerns, apparently). A lot of people are very excited by it.… Read more