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Rust to Assembly: Understanding the Inner Workings of Rust
How Rust compiles to assembly: enum memory layout, smart pointers, static vs dynamic dispatch, vtables, closures, vector iteration and async state machines.
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 6,949 posts.
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My Distributed Systems Seminar's Reading List for Spring 2017
Below is the first draft list of papers I plan to discuss in my distributed systems seminar in the Spring semester. If you have some suggest...
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Using parallel sequential scan in PostgreSQL
Parallel sequential scan is the first parallel access method in PostgreSQL and is introduced in version 9.6. The committer of this featu...
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Vm.overcommit_memory=2 is the right setting for servers
The Linux kernel has a feature where you can tune the behavior of memory allocations: the vm.overcommit_memory sysctl. When overcommit is enabled (sadly, this is the default), the kernel will typically return a mapping when brk(2) or mmap(2) is called to increase a program’s heap size, regardless of whether or not…
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NixOS and my descent into insanity
As I tend to do, I picked a topic to write about that is much larger in scope than I could manage in a reasonable amount of time. Did I learn? Apparently...
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Fastest Way to Delete Large Folders in Windows (2015)
The common way of deleting files and folders in Windows is via Windows Explorer (a.k.a. File Explorer ). This method is perfectly acceptable under normal circumstances, but becomes a real drag when dealing with large and complex folder structures. There is, in fact, a significant amount of of overhead when you trigger…
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Is the x86 Architecture Sustainable?
Robert O'Callahan. Christian. Kiwi. Software guy. All content human-authored unless otherwise noted.
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Which is not Posix
I learn a non-trivial number of things, because there’s Debian drama about them. The fact that the which command is not part of any standard just joined the flock.
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XDP for game programmers
Learn how you can use XDP/eBPF to get maximum bandwidth for your applications.
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How often does Python allocate?
The answer is "very often"
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Persisting state between AWS EC2 spot instances
Persisting state between AWS EC2 spot instances using Docker on an external volume
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Don't use musl if you care about performance
I've spent most of my career working inside the JVM, with a sidebar of Python. So the first time I hit incompatible libc with containerized Bifrost, and GPT suggested musl as the solution, not only did I jump on it, I moved my other Rust projects to musl as
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Metal for IntelliJ Platform
As you may already know, Apple deprecated the OpenGL rendering library in macOS Mojave and provided the Metal framework as a replacement. Metal better reflects the shift in CPU/GPU performance that ha
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The wrong way to switch operating systems on your server
world wide web benji-style
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What Is the Minimal Set of Optimizations Needed for Zero-Cost Abstraction?
Robert O'Callahan. Christian. Kiwi. Software guy. All content human-authored unless otherwise noted.
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Massive: The asm.js Benchmark
asm.js is a subset of JavaScript that is very easy to optimize. Most often it is generated by a compiler, such as Emscripten, from C or C++ code. The result ...
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Moving BBC Online to the Cloud
The story of how the BBC website has been completely rebuilt and moved from datacentres to the cloud.
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Most long-standing XHCI (USB 3.0+) issues resolved
Last month, I sat down and decided to at the very least attempt to fix our XHCI (USB 3 host controller) bus driver. Issues with it have been the most significant problem users have been facing, as most hardware made post-2012 has an XHCI chip as the …
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Appending to a file from multiple processes
Suppose you have multiple processes appending output to the same file without explicit synchronization. These processes might be working in parallel on different parts of the same problem, or these might be threads blocked individually reading different external inputs. There are two concerns that come into play:
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Implementing ‘strlen’ using SVE
In C, the length of a string in marked by a 0 byte at the end of the string. Thus to determine the length of the string, one must scan it, looking for the 0 byte. Recent ARM processors have a powerful instruction set (SVE) that is well suited for such problems. It allows you … Continue reading Implementing ‘strlen’…