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How multi-disk failures happen
Having seen this failure mode happen a couple times now, it's time to share. Yes, Virgil, multi-disk failures DO happen during RAID rebuilds. I have pictures, so it MUST be true!First,
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The latest blog posts to take off on Hacker News. 148 posts.
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FreeBSD 9.1 Release Announcement
The FreeBSD Release Engineering Team is pleased to announce the availability of FreeBSD 9.1-RELEASE. This is the second release from the stable/9 branch, which improves on the stability of FreeBSD 9.0 and introduces some new features. Some of the highlights:
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Speeding up HTTP with minimal protocol changes
As SPDY works its way through IETF ratification I began wondering whether it was really necessary to add a complex, binary protocol to th...
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Linux 3.7 released
Summary of the changes and new features merged in the Linux kernel during the 3.7 development cycle
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Forcing the CPU affinity can make a monothreaded process run 2-3x faster
Today, I chrooted in my system from sysresCD and I discovered that running eix-update (a gentoo portage indexing program) ran almost 3x fas...
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Pushing Nginx to its limit with Lua
At CloudFlare, Nginx is at the core of what we do. It is part of the underlying foundation of our reverse proxy service. In addition to the built-in Nginx functionalities, we use an array of custom C modules...
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Android Performance Case Study
Measure frame time, allocations, overdraw, and repeated work before changing code; the useful optimization is the one a trace can prove.
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GNU grep is 10x faster than Mac grep
That's likely all you need to do to install and make default GNU grep, which on my machine is a ~10x speedup over the grep that ships with Mac OS.
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Life of an instruction in LLVM
LLVM is a complex piece of software. There are several paths one may take on the quest of understanding how it works, none of which is simple. I recently had to dig in some areas of LLVM I was not previously familiar with, and this article is one of the outcomes of this quest.
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Java's Atomic and volatile, under the hood on x86
It’s well known that volatile in Java doesn’t mean the same thing as atomic . As Jeremy Manson says :
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532x Performance Increase for MongoDB with fractal tree indexes
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Message Oriented Programming
Designing around the messages, rather than the objects, brought my whole system into focus. If modules communicate by passing around self-contained textual data, or a simple structured format like JSON, they impose fewer assumptions on each other.
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3 billion items in Java Map with 16 GB RAM
One rainy evening I meditated about memory managment in Java and how effectively Java collections utilise memory. I made simple experiment, how much entries can I insert into Java Map with 16 GB of RAM?
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The little ssh that (sometimes) couldn't
Preface This is a technical article chronicling one of the most interesting bug hunts I’ve had the pleasure of chasing down. At AdGear Technologies Inc. where I work, ssh is king. We use it for management, monitoring, deployments, log file harvesting, even some event streaming. It’s solid, reliable, has all the…
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This Is Why They Call It a Weakly-Ordered CPU
On this blog, I’ve been rambling on about lock-free programming subjects such as acquire and release semantics and weakly-ordered CPUs. I’ve tried to make these …
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EC2 I/O
SentinelOne unifies AI-powered endpoint, cloud, identity, and data protection—enhanced by our Security Data Lake for seamless and efficient cybersecurity.
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Caching in theory and practice
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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