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Firmware Updates and Initial Performance Data for Data Center Systems
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Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 458 posts.
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Pause/unpause any X11 application
Many desktop oriented operating systems try to provide various usability improvements and features, like quite useful Expose or Dashboard in Mac OS X or useless Tiles concept in recent editions of …
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Architecture of Nautilus, the new Dropbox search engine
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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Why collision avoidance is harder for an AI-based system
Recent incident where Uber car was involved in an accident where a cyclist got killed has sparked many comments and opinions. Many blame…
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Command-line apps with Clojure and GraalVM: 300x better startup times
I am a fond Clojure user, and love to use it for both server-side projects and small command-line tools. I love its expressivity and concision, and I like th...
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A little bit of the one-time MacOS version still lingers in ZFS
You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…
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Streaming Video and Audio with Low Delay
Data sent over the Internet will traverse a large number of smaller links. The combination of these links forms a path from the sender to the receiver. Sometimes data is lost when it traverses this path. For video and audio streams such losses can lead to playback glitches if not corrected.
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Reading bits in far too many ways
Resurrecting an old tradition of this blog, let’s take a simple problem, go over a way too long list of alternative solutions, and evaluate their merits. Our simple problem is this: we want t…
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Building blocks of Amazon ECS
So, what’s Amazon Elastic Container Service (ECS)? ECS is a managed service for running containers on AWS, designed to make it easy to run applications in the cloud without worrying about configuring the environment for your code to run in. Using ECS, you can easily deploy containers to host a simple website or run…
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Designing Headers for HTTP Compression
One of the concerns that often comes up when someone creates a new HTTP header is how much “bloat” it will add on the network. This is especially relevant in requests, when a little bit of extra data can introduce a lot of latency when repeated on every request.
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Basics of Futexes
The futex (short for "Fast userspace mutex") mechanism was proposed by Linux contributors from IBM in 2002 [1] ; it was integrated into the kernel in late 2003. The main idea is to enable a more efficient way for userspace code to synchronize multiple threads, with minimal kernel involvement.
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High Sierra broke AFP searching on our server
Update to this story at 20 Feb 2018: I’ve been debugging the problem together with Apple and I feel like we are closing in on a solution. My current guess is that Finder indexing needs a lot more time on High Sierra than on Sierra clients.
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DragonFly BSD 5.4
DragonFly version 5.4 brings a new system compiler in GCC 8, improved NUMA support, a large number of network and virtual machine driver updates, and updates to video support. This release is 64-bit only, as with previous releases.
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The design and implementation of modern column-oriented database systems
The design and implementation of modern column-oriented database systems Abadi et al., Foundations and trends in databases, 2012 I came here by following the references in the Smoke paper we looked…
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A Basic Just-In-Time Compiler (2015)
Monday’s /r/dailyprogrammer challenge was to write a program to read a recurrence relation definition and, through interpretation, iterate it to some number of terms. It’s given an initial term ( u(0) ) and a sequence of operations, f , to apply to the previous term ( u(n + 1) = f(u(n)) ) to compute the next term…
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Rationale: Or why am I bothering to rewrite nanomsg?
I became involved in the nanomsg community back in 2014, when I wrote mangos as a pure Go implementation of the wire protocols behind nanomsg . I did that work because I was dissatisfied with the ZeroMQ licensing model and the C++ baggage that came with it. I also needed something that would work with Go on illumos …
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Incrementally improving the performance of a Python script
I have been doing a lot of competitive programming problems on Kattis lately. It is my favourite online judge, and I have been enjoying my climb up the Irish scoreboard in an attempt to regain my former glory of first place. In particular, today I was tackling the problem Pivot.
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Antique BeOS Content by Scot Hacker (2011)
In late 2002, Byte.com decided to combat falling ad revenue by charging admission to its archives of computing content. I have first-hand experience tring to harvest enough revenue from the Internet to pay operating costs, and fully support Byte's decision to move to a subscription model. However, my BeView columns on…
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Parallel Index Scans in PostgreSQL
There is a lot to say about parallelism in PostgreSQL. We have come a long way since I wrote my first post on this topic ( Parallel Sequen...
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The BEAM needs an APL-y language
One like, one unpopular opinion is one of them top Twitter games, innit?
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Anatomy of a Program in Memory (2009)
Memory management is the heart of operating systems; it is crucial for both programming and system administration. In the next few posts I'll cover memory with an eye towards practical aspects, but wi
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Discovering Issues in HTTP/2 with Chaos Testing
via Chaos Engineering we discovered that there are situations where HTTP/2 will perform worse than HTTP/1.
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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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EC2 Instance Update – C5 Instances with Local NVMe Storage
As you can see from my EC2 Instance History post, we add new instance types on a regular and frequent basis. Driven by increasingly powerful processors and designed to address an ever-widening set of use cases, the size and diversity of this list reflects the equally diverse group of EC2 customers! Near the bottom of…