Garbage collectors are scary
Florian Weimer Garbage collectors are expected to be invisible: if programmers (or even users) notice them, something is wrong. Usually, such problems are are performance problems, but there could be correctness issues as well. This makes implementing them a bit scary. As a hobby, I am working on a virtual instruction set architecture, mainly to better to understand the nature of computing, and ev
Garbage Collection for Systems Programmers
Let’s talk about one of the most performance-sensitive programs you run every day: your operating system. Since every speedup gives you more computer to compute with, an OS is never fast enough, so you can always find kernel and driver developers optimizing the bejesus out of their code. Operating systems also need to be massively concurrent. Not only is your OS scheduling all userspace processes
Garbage Collection Without Unsafe Code
Many people, including myself, have implemented garbage collection (GC) libraries for Rust. Manish Goregaokar wrote up a fantastic survey of this space a few years ago. These libraries aim to provide a safe API for their users to consume: an unsafe-free interface which soundly encapsulates and hides the library’s internal unsafe code. The one exception is their mechanism to enumerate the outgoing
i accidentally a scheme -- wingolog
Good evening, dear hackfriends. Tonight's missive is an apology: not quite in the sense of expiation, though not quite not that, either; rather, apology in the sense of explanation, of exegesis: apologia. See, I accidentally made a Scheme. I know I have enough Scheme implementations already, but I went and made another one. It's for a maybe good reason, though! one does not simply a scheme I feel
Gradual Write-Barrier Insertion into a Ruby Interpreter
Gradual Write-Barrier Insertion into a Ruby Interpreter Koichi Sasada Cookpad Inc. Japan ko1@cookpad.com Abstract Ruby is a popular object-oriented programming language, and the performance of the Ruby garbage collector (GC) di- rectly affects the execution time of Ruby programs. Ruby 2.0 and earlier versions employed an inefficient non-generational conservative mark-and-sweep GC. To improve this
It’s a smol_world
a post by @snej in Thought Palace on Sat, February 25 2023 at 11:03 AM (edited Sat, February 25 2023 at 2:09 PM) About a month ago, for some reason I got a bee in my bonnet to build a simple garbage-collected memory manager and object model. Maybe it’s because in my day job I’ve been working with a very complex one (V8)? So I did. It’s called smol_world. You can read all about it in the README at
whippet: towards a new local maximum — wingolog
Guile is... Mostly written in Scheme Also a 30 year old C library // API SCM scm_cons (SCM car, SCM cdr); // Many third-party users SCM x = scm_cons (a, b); So the context for the whole effort is that Guile has this part of its implementation which is in C. It also exposes a lot of that implementation to users as an API. Putting the C into GC SCM x = scm_cons (a, b); Live objects: the roots, plus
Pictures of a Working Garbage Collector
Screencast If you click on this screenshot, you'll see OSH running ./configure from CPython's tarball, with GC debug output. This is: 16K lines of gnarly shell generated by GNU autoconf Running in our shell interpreter, written in ~40K lines of typed Python. But, it's translated to ~80K lines of pure C++! That generated C++ runs on top of a ~4K line runtime of garbage collected data structures, an
Implementing the Perceus reference counting GC
Introduction Reference counting (RC) has rather been a minor party to the other garbage collection (GC) algorithms in functional programming in the last decades as, for example, OCaml and Haskell use non-RC GC. However, several recent papers, such as Counting Immutable Beans: Reference Counting Optimized for Purely Functional Programming and Perceus: Garbage Free Reference Counting with Reuse, sho
Treadmill
Treadmill is a "real-time" in-place garbage collection algorithm designed by H. Baker [0]. It is simple, elegant, efficient and surprisingly little known. Speaking of which, Mr. Baker's Wikipedia page rivals one for an obscure Roman decadent poet in scarcity of information. The general situation of garbage collection is that there is a program (called a mutator in this case) that allocates objects
Understanding Garbage Collection in JavaScriptCore From Scratch
JavaScript relies on garbage collection (GC) to reclaim memory. In this post, we will dig into JSC’s garbage collection system. Before we start, let me briefly introduce myself. I am Haoran Xu, a PhD student at Stanford University. While I have not yet contributed a lot to JSC, I found JSC a treasure of elegant compiler designs and efficient implementations, and my research is exploring ways to tr
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a whiff of whiffle -- wingolog
An attempt at visualizing the Go GC
Parallel garbage collection for SBCL
https://claytonwramsey.github.io/2023/08/14/dumpster.html
Java Enhances Z Garbage Collector with Generational Capabilities
pre-initialization of garbage-collected webassembly heaps — wingolog
three approaches to heap sizing — wingolog
a simple semi-space collector — wingolog
Oil 0.12.7 - Garbage Collector Problems