Pinpointing the hottest Go code paths with high CPU usage (using OpenResty XRay)

  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

Pinpointing the blocking Python code paths (using OpenResty XRay)

  • Problem: low CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the blocking Python code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: low CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the blocking Python code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

Two bugs in Linux kernels' tracing subsystem (found by OpenResty XRay)

  • Kernel deadlocks in user-space memory reading
  • Data races in x86 breakpoint insertion of the kernel
  • What is OpenResty XRay
Photo by Yichun Zhang
  • Kernel deadlocks in user-space memory reading
  • Data races in x86 breakpoint insertion of the kernel
  • What is OpenResty XRay

Pinpointing hottest Perl code paths (using OpenResty XRay)

  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Perl code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Perl code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

Pinpointing hottest Lua code paths in online OpenResty/Nginx servers (using OpenResty XRay)

  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Lua code paths
  • Automatic analysis and reports
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Lua code paths
  • Automatic analysis and reports

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

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
Photo by Yichun Zhang
  • 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

Troubleshooting the extra 200-ms request latency online

  • The Problem
  • The Analsysis Process
  • Fully-automated analysis
  • What is OpenResty XRay
Photo by Yichun Zhang
  • The Problem
  • The Analsysis Process
  • Fully-automated analysis
  • What is OpenResty XRay

Pinpointing leaked Lua tables with OpenResty XRay's command-line tools

  • How LuaJIT manages memory
  • OpenResty XRay’s command-line tools
  • An leaking example
  • Analysis procedure
  • lj-gco-ref analyzer
  • Fully-automated analysis
  • How LuaJIT manages memory
  • OpenResty XRay’s command-line tools
  • An leaking example
  • Analysis procedure
  • lj-gco-ref analyzer
  • Fully-automated analysis

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
Photo by Yichun Zhang
  • 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

How to deploy the on-premises version of OpenResty XRay on Microsoft's Azure cloud

  • Create a subscription and a resource group
  • Create the Azure Kubernetes service
  • Prepare the environment variables
  • Log in to Azure from the command line
  • Create the namespace and secret for Kubernetes
  • Create the Azure Disk
  • Update the configuration file for the persistent volume
  • Update the Kubernetes configuration file
  • Create the persistent volume
  • Deploy the Kubernetes service
  • Configure the application gateway
  • Create a subscription and a resource group
  • Create the Azure Kubernetes service
  • Prepare the environment variables
  • Log in to Azure from the command line
  • Create the namespace and secret for Kubernetes
  • Create the Azure Disk
  • Update the configuration file for the persistent volume
  • Update the Kubernetes configuration file
  • Create the persistent volume
  • Deploy the Kubernetes service
  • Configure the application gateway

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

  • The Problem
  • Analyses
  • Solutions
  • Results
Photo by Yichun Zhang
  • The Problem
  • Analyses
  • Solutions
  • Results

The Wonderland of Dynamic Tracing (Part 1 of 3)

  • Dynamic Tracing
  • What It Is
  • Too Good to be True?
  • How it Works
  • Still Having Doubts?
  • The Advantages of Dynamic Tracing
  • DTrace
  • SystemTap
  • DTrace and SystemTap
  • Applications of SystemTap in Production
Photo by Philip Brown
  • Dynamic Tracing
  • What It Is
  • Too Good to be True?
  • How it Works
  • Still Having Doubts?
  • The Advantages of Dynamic Tracing
  • DTrace
  • SystemTap
  • DTrace and SystemTap
  • Applications of SystemTap in Production

The Wonderland of Dynamic Tracing (Part 2 of 3)

  • Flame Graphs
  • Methodology
  • Knowledge Is Power
  • Open-Source and Debug Symbols
  • Flame Graphs
  • Methodology
  • Knowledge Is Power
  • Open-Source and Debug Symbols

The Wonderland of Dynamic Tracing (Part 3 of 3)

  • Dynamic Tracing Support in Linux Kernels
  • Hardware Tracing
  • Analyze Remains of Dead Process
  • Traditional Debugging Technologies
  • A Messy World of Debugging
  • OpenResty XRay
Photo by L N
  • Dynamic Tracing Support in Linux Kernels
  • Hardware Tracing
  • Analyze Remains of Dead Process
  • Traditional Debugging Technologies
  • A Messy World of Debugging
  • OpenResty XRay

Optimize Memory Fragmentation due to Huge Nginx Configuration

  • Challenges
  • Analyses
  • Solutions
  • Results
Photo by Yichun Zhang
  • Challenges
  • Analyses
  • Solutions
  • Results

New FAQ Doc for OpenResty XRay

We recently prepared a new FAQ document for OpenResty XRay
Photo by Yichun Zhang
We recently prepared a new FAQ document for OpenResty XRay

Automatic Analysis Reports in OpenResty XRay

  • The Past
  • The Present
  • The Future
Photo by Yichun Zhang
  • The Past
  • The Present
  • The Future

Resolving Bilibili’s major site incident with OpenResty XRay

  • The incident
  • Process of resolution
  • Hardening after the incident
  • OpenResty XRay Services
Photo by Yichun Zhang
  • The incident
  • Process of resolution
  • Hardening after the incident
  • OpenResty XRay Services

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
  • 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
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