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ChibiHash: Small, Fast 64 bit hash function
Update Nov 30: I've added a version 2, which makes the benchmarks and design overview section in this article outdated. See the github repo for updated benchmarks.
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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A Practical Guide to Watchdogs for Embedded Systems
A community and blog for embedded software makers
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Integrated assembler improvements in LLVM 19
Within the LLVM project, MC is a library responsible for handling assembly, disassembly, and object file formats. Intro to the LLVM MC Project, which was written back in 2010, remains a good source to understand the high-level structures. In the latest release cycle, substantial effort has been dedicated to refining…
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Batch size one billion: SQLite insert speedups, from the useful to the absurd
A little-discussed method enables inserting rows with bound data into SQLite faster than any existing technique. This novel method is then discovered to have a drawback that makes it generally unusable. The rest of this article explores how to get the best insert performance out of SQLite generally; what's in your…
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Dynamo vs. Cassandra: Systems Design of NoSQL Databases (2018)
A comparison of ideas behind Dynamo and Cassandra
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Pick Your Distributed Poison
One of the hardest things for people to understand with distributed systems is that eventual consistency is the same thing as eventual inconsistency. The very...
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Mitigations are attack surface, too
Posted by Jann Horn, Project ZeroIntroductionThis blog post discusses a bug leading to memory cor...
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The limitations of sampling profilers
Perf is probably the most widely used general purpose performance debugging tool on Linux. There are multiple contenders for the #2 spot, and, like perf, they're sampling profilers. Sampling profilers are great. They tend to be easy-to-use and low-overhead compared to most alternatives. However, there are large…
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Robert Elder Software Linux Operating System
Dec 12, 2019 Update: This piece of software is no longer available as I have turned it off due to lack of interest. The article below used to contain a number of links which I have removed. The content below remains only for archival purposes.
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FreeBSD on the Graviton 3
As far as FreeBSD is concerned, Graviton 3 is mostly just a faster version of the Graviton 2: Most things "just work", and the things which don't work on Graviton 2 — hotplug devices and cleanly shutting down an instance via the EC2 API — also don't work on Graviton 3. (Want to help get these fixed? Sponsor my work on…
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Boosting zopfli performance
Introduction Deflate compression has been around for over 20 years. It's the format used inside most ZIP files. It's used by HTTP to redu...
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Optimizing Magic Pocket for cold storage
Dash knows your context, your team, and your work, so your team can stay organized, easily find and share knowledge, and keep projects secure, all from one place.
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Vulnerabilities in the TPM 2.0 reference implementation code
In this blog post we discuss the details of two vulnerabilities we discovered in the Trusted Platform Module (TPM) 2.0 reference implementation code. These two vulnerabilities, an out-of-bounds write (CVE-2023-1017) and an out-of-bounds read (CVE-2023-1018), affected several TPM 2.0 software implementations (such as…
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Linux 3.3: Finally a little good news for bufferbloat
While I was out chasing computer history last week, the Linux 3.3 kernel was released. And a very interesting release it is, though not for its vaunted re-inclusion of certain Android kernel hacks. I think that modest move is being overblown in the press. No, Linux 3.3 appears to be the first OS to really
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The structure of a GCC back end
This is part one of a series “ Writing a GCC back end ”. The GCC back end is configured in gcc/config.host and the implementation is p...
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How expensive is integer-overflow trapping in C++?
Integers in programming languages have a valid range but arithmetic operations can result in values that exceed such ranges. For example, adding two large integers can result in an integer that cannot be represented in the integer type. We often refer to such error conditions as overflows. In a programming languages…
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Apple Silicon is an inconvenient truth
Link to: https://wormsandviruses.com/2022/07/a-burger-without-heinz/
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Building on Rock, Not Sand
Robert O'Callahan. Christian. Kiwi. Software guy. All content human-authored unless otherwise noted.
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The Road to the WASM Component Model 1.0
WASI P3 is almost here, bringing native async support to the WebAssembly System Interface (WASI) and Component Model. In this post, we’re looking to the next big milestone: a stable, formally specified Component Model 1.0.At February’s B...
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Space travel via tether between asteroids
I wish I knew if my math was correct...
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Rethinking the filesystem as global mutable state, the root of all evil
When you invoke a function in an imperative programming language, you pass arguments to that function. But that function may also operate on global mutable state, meaning there are other factors in the operation of that function than merely the arguments you pass to it. To some extent this kind of contextual, implicit…
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Up to 4GB of Memory in WebAssembly
Thanks to recent work in Chrome and Emscripten, you can now use up to 4GB of memory in WebAssembly applications. That’s up from the previous limit of 2GB. It might seem odd that there was ever a limit - after all, no work was needed to allow people to use 512MB or 1GB of memory! - but it turns out that there are some…
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How Cloudflare responded to the “Copy Fail” Linux vulnerability
When a critical Linux kernel privilege escalation was publicly disclosed, Cloudflare's security and engineering teams detected, investigated, and mitigated the threat across our global fleet, confirming zero customer impact and no malicious exploitation.