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OPENRESTY XRAY Nov 12, 2021

OPENRESTY XRAY Nov 12, 2021

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 1)
Photo by Yichun Zhang

* What is Dynamic Tracing * Why the "Y" Name * Getting Started * Various Backends and Runtimes * Why a Unified Frontend Language * The Language Syntax

OPENRESTY XRAY Aug 31, 2020

OPENRESTY XRAY Aug 31, 2020

Introduction to Lua-Land CPU Flame Graphs
Photo by Guido Jansen

* What is a Flame Graph * Simple Lua samples * Complicated Lua applications * Sampling overhead * Safety * Compatibility * Other types of Lua-land Flame Graphs

OPENRESTY XRAY Aug 10, 2020

OPENRESTY XRAY Aug 10, 2020

Memory Fragmentation in OpenResty and Nginx's Shared Memory Zones
Photo by Elena Mozhvilo

* An empty zone * Filling entries of similar sizes * Deleting odd-numbered keys * Deleting the keys in the first half * Mitigating Fragmentation

OPENRESTY XRAY Aug 4, 2020

OPENRESTY XRAY Aug 4, 2020

How OpenResty and Nginx Shared Memory Zones Consume RAM
Photo by Jose G. Ortega Castro

* Slabs and pages * What is allocated is not what is paid for * Fake Memory Leaks * HUP reload

OPENRESTY XRAY Jan 21, 2020

OPENRESTY XRAY Jan 21, 2020

How OpenResty and Nginx Allocate and Manage Memory
Photo by Harrison Broadbent

* On The System Level * On The Application Level * For Traditional Nginx Servers

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OPENRESTY XRAY Aug 24, 2022

OPENRESTY XRAY Aug 24, 2022

Resolving Bilibili’s major site incident with OpenResty XRay
Photo by Yichun Zhang

* The incident * Process of resolution * Hardening after the incident * OpenResty XRay Services

OPENRESTY XRAY Jul 14, 2022

OPENRESTY XRAY Jul 14, 2022

Tracing the Slowest PCRE Regular Expressions in OpenResty or Nginx Processes
Tracing the Slowest PCRE Regular Expressions in OpenResty or Nginx Processes

* System Environment * Narrowing Down the Culprit without Guessing * Limiting the execution overhead of PCRE * Non-Backtracking Regular Expression Engines * Lua's Builtin Patterns * Tracing Applications inside Containers * How The Tools are Implemented * The Overhead of the Tools

OPENRESTY XRAY Jun 11, 2022

OPENRESTY XRAY Jun 11, 2022

Listing Loaded Lua Modules in OpenResty or Nginx Processes
Photo by Yichun Zhang

* System Environment * Names of Loaded Lua Modules * Running Directly in the Web Console * Tracing Applications inside Containers * How The Tools are Implemented * The Overhead of the Tools

OPENRESTY XRAY Jun 10, 2022

OPENRESTY XRAY Jun 10, 2022

Analyzing the Most CPU-Consuming Requests in OpenResty or Nginx
Photo by Yichun Zhang

* System Environment * CPU-Hottest Request Hostnames * CPU-Hottest Request URIs * Digging Deeper * Running Directly in the Web Console * Tracing Applications inside Containers * How The Tools are Implemented * The Overhead of the Tools

OPENRESTY EDGE Jun 7, 2022

OPENRESTY EDGE Jun 7, 2022

How to use custom dynamic metrics in OpenResty Edge
Photo by Yichun Zhang

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