OpenResty's Official Blog for Technologies & Products

OPENRESTY XRAY Nov 12, 2021

OPENRESTY XRAY Nov 12, 2021

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

* 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

* 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

* 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

* 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

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

OPENRESTY XRAY Aug 24, 2022

OPENRESTY XRAY Aug 24, 2022

Resolving Bilibili’s major site incident with OpenResty XRay

* 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

* 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

* 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

* 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