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Why is my tcp not reliable? (2009)
This post is about an obscure corner of TCP network programming, a corner where almost everybody doesn’t quite get what is going on. I used to think I understood it, but found out last week that I didn’t.
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Adventures in JIT compilation: Part 1 – an interpreter
This is the first post in a series about JIT compilers. The plan is to take a simple input language and develop some interpreters and JITs for it, in roughtly increasing degree of complexity. It's my hope that by the end of the series readers will have a good understanding of what it takes to develop a JIT compiler…
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OpenBSD 6.2 and CDE
If you've noticed a disruption in the time-space continuum recently, it is likely because I have finally been able to compile and install ...
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Playing with Kernel TLS in Linux 4.13 and Go
The 1600 LoC patch allows userspace to pass the kernel the encryption keys for an established connection, making encryption happen transparently inside the kernel.
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Negative Result: Reading Kernel Memory from User Mode
I were going to write an introduction about how important negative results can be. I didn’t. I assume you can figure out for yourself why that is and if not you got all the more reason to read this blog post. If you think it’s trivial why my result is negative, you definitely need to read the blog post.
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Don’t run this on any system you expect to be up they said, but we did it anyway
This is the story of how we upgraded over 2000 Ubuntu production servers – turning over millions an hour – by installing the operating system in memory, wiping the root disk and reinstalling the OS back on disk from RAM. We did it, there was zero data loss and it saved us lots of time and...
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Stream VByte: breaking new speed records for integer compression
In many information systems, we work with arrays of integers. For example, maybe you need to keep track of which records in a database contain a given value. This sort of mapping can be expressed as an array of integers. These arrays can end up taking up a large fraction of your memory or disk … Continue reading…
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Casually removing root files
You’re walking at $HOME, minding your own business. $ whoami > user $ pwd > /home/user But something is bothering your feet. It’s like if a little rock has fallen into your shoe. You take it off, to see what’s going on. $ ls -lah ./left-shoe ---------- 1 root root 4 May 30 13:20 little-rock That’s odd. It’s there, but…
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Thrill – Big Data Processing with C++
Yesterday, I discovered an experimental Big Data processing framework written in C++ called Thrill. As most of you surely know, the well-known frameworks of this kind are mostly based on JVM, like …
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Atom 1.19 – Improved Responsiveness and Memory Usage
We are archiving Atom and all projects under the Atom organization for an official sunset on December 15, 2022.
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Project Snowflake: Non-blocking safe manual memory management in .NET
We propose integrating safe manual memory management with garbage collection in the .NET runtime to get the best of both worlds.
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Mono 5.0 Ships with Concurrent Garbage Collector
In Mono 5.0 we are shipping a new operation mode for our Garbage Collector: Concurrent Garbage Collection.
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OpenBSD on the Huawei MateBook X
The Huawei MateBook X is a high-quality 13" ultra-thin laptop with a fanless Core i5 processor. It is obviously biting the design of the Apple 12" MacBook , but it does have some notable improvements such as a slightly larger screen, a more usable keyboard with adequate key travel, and 2 USB-C ports.
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Another Case of Obscure CPU Nondeterminism
Robert O'Callahan. Christian. Kiwi. Software guy. All content human-authored unless otherwise noted.
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Sysdig Inspect: A GUI for System Call Analysis
Sysdig Inspect is a powerful interface for container troubleshooting and security investigation that uses sysdig capture files for local analysis
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Multiple regex performance shootout: RE2 vs. Intel's Hyperscan
Access technologies from partnerships with the community and leaders. Everything open source at Intel. We have a lot to share and a lot to learn.
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Why doesn’t the clock in the taskbar display seconds? (2003)
Practical development throughout the evolution of Windows.
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Hunting Performance in Python Code: Measuring Memory Consumption
In this post I will talk about some tools that can help us solve a painful problem in Python, especially when using PyPy: memory consumption. Why are we concerned with this in the first place? Why …
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High Sierra's Disk Utility does not recognize unformatted disks
unless you click View > Show All Devices, quit Disk Utility, then relaunch it (thanks to xenadu02 for the workaround !)
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Exploiting Windows 10 in a Local Network with WPAD/PAC and JScript
by Ivan Fratric, Thomas Dullien, James Forshaw and Steven VittitoeIntroMany widely-deployed techn...
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Revisiting 64-bit-ness in Visual Studio and elsewhere (2015)
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