OpenResty XRay Aug 28, 2023

OpenResty XRay Updated Aug 28, 2023 5 mins read

How we solved a CPU bottleneck caused by Lua exceptions in a custom Kong plugin (using OpenResty XRay)

• The problem: high CPU usage in Kong servers
• The analysis & report
• The result: improved performance and reduced CPU usage

OpenResty XRay Jul 15, 2023

OpenResty XRay Updated Jul 15, 2023 7 mins read

Memory and CPU usage statistics among Kong plugins online (using OpenResty XRay)

• CPU usage among all Kong plugins in a server process
• Memory usage among all Kong plugins in a server process
• Extra overhead for the servers

OpenResty XRay Aug 29, 2023

OpenResty XRay Updated Aug 29, 2023 5 mins read

Troubleshooting the extra 200-ms request latency online

• The Problem
• The Analsysis Process
• Fully-automated analysis
• What is OpenResty XRay

OpenResty XRay Jul 22, 2023

OpenResty XRay Updated Jul 22, 2023 8 mins read

Real-Time Request Counting against Nginx Processes via YSQL

• How to install the run-ysql tool
• Count total requests served in real time
• Filter out specific requests
• Using YSQL in the Web Console
• True non-invasive tracing

OpenResty XRay Aug 28, 2023

OpenResty XRay Updated Aug 28, 2023 6 mins read

When Lua IPC Pipes Block OpenResty or Nginx's Event Loops

• The Problem
• Analyses
• Solutions
• Results

OpenResty XRay Dec 28, 2022

OpenResty XRay Updated Dec 28, 2022 8 mins read

Optimize Memory Fragmentation due to Huge Nginx Configuration

• Challenges
• Analyses
• Solutions
• Results

OpenResty XRay Jun 28, 2023

OpenResty XRay Updated Jun 28, 2023 11 mins read

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 Apr 10, 2024

OpenResty XRay Updated Apr 10, 2024 9 mins read

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 Apr 10, 2024

OpenResty XRay Updated Apr 10, 2024 12 mins read

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 Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 4 mins read

Install OpenResty on Ubuntu 20.04 via apt-get

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 5 mins read

Streaming HTTP Response Output in OpenResty

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 4 mins read

Precompile Lua Modules into LuaJIT Bytecode to Speedup OpenResty Startup

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 4 mins read

Timing Lua Code Correctly in OpenResty

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 3 mins read

Lookup OpenResty Documentation on Terminal with restydoc

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 4 mins read

Share Data Across Requests Served by OpenResty

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 4 mins read

Install OpenResty on CentOS 8 via dnf

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 4 mins read

The resty Command-Line Utility Demo

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 4 mins read

Write Your Own Lua Modules for OpenResty Applications

OpenResty Open Source Oct 20, 2023

OpenResty Open Source Updated Oct 20, 2023 3 mins read

Hello World HTTP Example in OpenResty

OpenResty XRay Apr 10, 2024

OpenResty XRay Updated Apr 10, 2024 19 mins read

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 Jul 6, 2023

OpenResty XRay Updated Jul 6, 2023 10 mins read

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 Jul 6, 2023

OpenResty XRay Updated Jul 6, 2023 13 mins read

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 Apr 10, 2024

OpenResty XRay Updated Apr 10, 2024 11 mins read

How OpenResty and Nginx Allocate and Manage Memory

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