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Why we moved away from AWS
Blippex — a search engine made by the people, for the people
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Introduction to x64 Assembly
Access technologies that use data for modern code, machine learning, big data, analytics, networking, storage, servers, cloud, and more.
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Hacking the OS X Kernel for Fun and Profiles
My last post described how user-level CPU profilers work, and specifically how Google’s pprof profiler gathers its CPU profiles with the help of the operating system. The specific feature needed from the operating system is the profiling timer provided by setitimer (2) and the SIGPROF signals that it delivers.
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Why do RET instructions have a REPZ prepended on x86?
Recently, we began work on a binary static analysis tool. While reading some disassembly, we came across a weird-looking instruction, that was present in most everything we gave objdump .
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Samsung's exFAT Linux driver officially released as GPL
Conservancy's GPL Compliance Project for Linux Developers is pleased to announce its role in assisting Samsung in a recent public compliance issue. The compliance issue was brought to Conservancy's attention when source code of an exFAT filesystem driver for Linux was unintentionally released via GitHub, and…
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Staring at the Sun: Dalvik vs. Asm.js vs. Native
As many of you are probably already aware, Mozilla has recently gotten into the mobile OS space with Firefox OS. Firefox OS is built using ...
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Intel i7 loop performance anomaly
Recently I've been doing some benchmarking and came upon a very surprising behavior from a number of different Intel i7 CPUs (it manifests on Sandy Bridge and Haswell desktop-class CPUs as well as Sandy Bridge-EP Xeon CPUs).
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The network is reliable
I’ve been discussing Jepsen and partition tolerance with Peter Bailis over the past few weeks, and I’m honored to present this post as a collaboration between the two of us. We’d also like to extend our sincere appreciation to everyone who contributed their research and experience to this piece.
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Parallelism and concurrency need different tools
In this piece, I disagree with Joe Armstrong and Rob Pike, basing my argument on the differences between vending machines and gift boxes (illustrated with drawings carefully prepared in Microsoft Paint).
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Go 1.1 performance improvements
This is the first in a series of articles analysing the performance improvements in the Go 1.1 release.
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Hacking Google's HVAC Systems
Arctic Wolf®, the leader in security operations, has acquired Cylance, a pioneer of AI-based endpoint security.
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Call me maybe: Redis redux
In a recent blog post , antirez detailed a new operation in Redis: WAIT . WAIT is proposed as an enhancement to Redis’ replication protocol to reduce the window of data loss in replicated Redis systems; clients can block awaiting acknowledgement of a write to a given number of nodes (or time out if the given threshold…
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Happy new year and goodbye bzip2
We started listing xz-compressed versions of kernel archives in all our announcements back in March 2013, and the time has come to complete the switch. Effective immediately, we will no longer be providing bzip2-compressed versions for new releases of the Linux kernel and other software. Any previously released…
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Tracking down a memory leak in Ruby's EventMachine
At Stripe, we rely heavily on ruby and EventMachine to power various internal and external services. Over the last several months, we’ve known that one such service suffered from a gradual memory leak, that would cause its memory usage to gradually balloon from a normal ~50MB to multiple gigabytes. It was easy enough…
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Windows Timer Resolution: Megawatts Wasted
The default timer resolution on Windows is 15.6 ms – a timer interrupt 64 times a second. When programs increase the timer frequency they increase power consumption and harm battery life. They also…
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Firefox, Heal Thyself
This week's release of Firefox includes the beginning of a pretty cool feature. The Firefox Health Report is a new system we've built to log basic health information about your ...
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More on Postgres Performance
If you missed my previous post on Understanding Postgres Performance its a great starting point. On this particular post I’m going to dig in to some real life examples of optimizing queries and indexes. It all starts with stats I wrote about some of the great new features in Postgres 9.2 in the recent announcement on…
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What are Linux containers and how did they come about?
Today's announced collaboration between Red Hat and dotCloud , the company behind Docker, is exciting for a lot of reasons. As the release n...