How we found a bug in Go's arm64 compiler
2025-10-08
84 million requests a second means even rare bugs appear often. We'll reveal how we discovered a race condition in the Go arm64 compiler and got it fixed....
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Building Jetflow: a framework for flexible, performant data pipelines at Cloudflare
2025-07-23
Faced with a data-ingestion challenge at a massive scale, Cloudflare's Business Intelligence team built a new framework called Jetflow....
Over 700 million events/second: How we make sense of too much data
2025-01-27
Here we explain how we made our data pipeline scale to 700 million events per second while becoming more resilient than ever before. We share some math behind our approach and some of the designs of ...
Improving platform resilience at Cloudflare through automation
2024-10-09
We realized that we need a way to automatically heal our platform from an operations perspective, and designed and built a workflow orchestration platform to provide these self-healing capabilities ...
Intelligent, automatic restarts for unhealthy Kafka consumers
2023-01-24
At Cloudflare, we take steps to ensure we are resilient against failure at all levels of our infrastructure. This includes Kafka, which we use for critical workflows such as sending time-sensitive emails and alerts....
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February 17, 2022 5:02 PM
Production ready eBPF, or how we fixed the BSD socket API
We are open sourcing the production tooling we’ve built for the sk_lookup hook we contributed to the Linux kernel, called tubular...
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October 13, 2021 12:59 PM
Pairings in CIRCL
Our Go cryptographic library CIRCL announces support for pairing-based cryptography....
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November 29, 2018 9:54 AM
Know your SCM_RIGHTS
As TLS 1.3 was ratified earlier this year, I was recollecting how we got started with it here at Cloudflare. We made the decision to be early adopters of TLS 1.3 a little over two years ago. It was a very important decision, and we took it very seriously....
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October 11, 2018 2:30 PM
Graceful upgrades in Go
The idea behind graceful upgrades is to swap out the configuration and code of a process while it is running, without anyone noticing it. If this sounds error-prone, dangerous, undesirable and in general a bad idea – I’m with you....
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September 02, 2018 7:35 AM
Porting Our Software to ARM64
As we enable more ARM64[1] machines in our network, I want to give some technical insight into the process we went through to reach software parity in our multi-architecture environment....
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April 26, 2018 5:32 AM
Copenhagen & London developers, join us for five events this May
Are you based in Copenhagen or London? Drop by some talks we're hosting about the use of Go, Kubernetes, and Cloudflare’s Mobile SDK....
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February 20, 2018 7:49 PM
Using Go as a scripting language in Linux
At Cloudflare we like Go. We use it in many in-house software projects as well as parts of bigger pipeline systems. But can we take Go to the next level and use it as a scripting language for our favourite operating system, Linux?...
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November 13, 2017 10:31 AM
Go, don't collect my garbage
Not long ago I needed to benchmark the performance of Golang on a many-core machine. I took several of the benchmarks that are bundled with the Go source code, copied them, and modified them to run on all available threads....
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November 10, 2017 3:00 PM
Cloudflare Wants to Buy Your Meetup Group Pizza
If you’re a web dev / devops / etc. meetup group that also works toward building a faster, safer Internet, I want to support your awesome group by buying you pizza. ...
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November 08, 2017 8:03 PM
ARM Takes Wing: Qualcomm vs. Intel CPU comparison
One of the nicer perks I have here at Cloudflare is access to the latest hardware, long before it even reaches the market. Until recently I mostly played with Intel hardware. ...
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October 03, 2017 10:00 AM
WHOIS going to be at the Grace Hopper Celebration?
Ubuntu us are doing the round trip! It’s time to live - WAN you arrive at GHC, come meet us and say HELO (we love GNU faces, we’ll be very api to meet you). When you’re exhausted like IPv4, git over to the Cloudflare corner to reboot....
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October 01, 2017 5:00 PM
Go Hack Nights at Cloudflare
Recently we launched an internal monthly Go Hack Night at our San Francisco office, open to anyone who works at Cloudflare regardless of their department or position. ...
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June 29, 2016 1:09 PM
The complete guide to Go net/http timeouts
When writing an HTTP server or client in Go, timeouts are amongst the easiest and most subtle things to get wrong: there’s many to choose from, and a mistake can have no consequences for a long time, until the network glitches and the process hangs....
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April 27, 2016 3:01 PM
Building the simplest Go static analysis tool
Go native vendoring (a.k.a. GO15VENDOREXPERIMENT) allows you to freeze dependencies by putting them in a vendor folder in your project. The compiler will then look there before searching the GOPATH....
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January 19, 2016 6:19 PM
Go coverage with external tests
The Go test coverage implementation is quite ingenious: when asked to, the Go compiler will preprocess the source so that when each code portion is executed a bit is set in a coverage bitmap....
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