Build Stuff'16 Lithuania

Delivering code is no longer the bottleneck. Delivering the right code to solve the right problem is. This poses some problems since our processes are tailored around an obsolete (and maybe wrong from the beginning) idea of software development. What happens when you shift the perspective?

Learn how to take products to market faster, cheaper and more effectively using lean requirements gathering techniques. We'll review the tools and techniques used in lean requirements, and discuss how to leverage lean startup practices inside large organizations to increase innovation, decrease costs and improve speed to market. We'll also explore examples of how companies around the world are using this approach to disrupt global markets and pioneer innovation.

The Wix platform hosts over 80 million websites, with billions of visitors per day, all built using the Wix Editor. In this talk I will cover how we measure performance, and the techniques and methodologies we use to improve it. I'll examine the tools and frameworks that we use, and discuss what worked for us and what didn't.

The Linux kernel has multiple "tracers" built-in, with various degrees of support for aggregation, dynamic probes, parameter processing, filtering, histograms, and other features. Starting from the venerable ftrace, introduced in kernel 2.6, all the way through eBPF, which is still under development, there are many options to choose from when you need to statically instrument your software with probes, or diagnose issues in the field using the system's dynamic probes. Modern tools include SystemTap, SysDig, ktap, perf, bcc, and others. In this talk, we will begin by reviewing the modern tracing landscape -- ftrace, perf_events, kprobes, uprobes, eBPF -- and what insight into system activity these tools can offer. Then, we will look at specific examples of using tracing tools for diagnostics: tracing a memory leak using low-overhead kmalloc/kfree instrumentation, diagnosing a CPU caching issue using perf stat, probing network and block I/O latency distributions under load, or merely snooping user activities by capturing terminal input and output.