ylang

OpenResty XRay Jan 14, 2024

OpenResty XRay Updated Jan 14, 2024 4 mins read

Dynamic-Tracing Custom Go Programs with Custom Ylang Analyzers (using OpenResty XRay)

Insert two key-value Pairs into a Go Variable
Write a Customize Ylang Analyzer to Dynamically Trace the Go program
Test the Results
What is OpenResty XRay

Insert two key-value Pairs into a Go Variable
Write a Customize Ylang Analyzer to Dynamically Trace the Go program
Test the Results
What is OpenResty XRay

OpenResty XRay Sep 20, 2023

OpenResty XRay Updated Sep 20, 2023 14 mins read

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 4 of 4)

Transparent Container Tracing
Efficient Stack Unwinding
Analyzing Dead Processes (Core Dumps)
Very Low Tracing Overhead
Standard Ylang Libraries & Tools
Network Filtering & Control
The Ylang Compiler’s Implementation
Operating System Support
Contributions to Open-Source Communities

Photo by Yichun Zhang

Transparent Container Tracing
Efficient Stack Unwinding
Analyzing Dead Processes (Core Dumps)
Very Low Tracing Overhead
Standard Ylang Libraries & Tools
Network Filtering & Control
The Ylang Compiler’s Implementation
Operating System Support
Contributions to Open-Source Communities

OpenResty XRay Jul 10, 2023

OpenResty XRay Updated Jul 10, 2023 10 mins read

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 3 of 4)

The Language Syntax (Continued)
- String Literals
- Built-in Regex Support
- Full Control-Flow Support
- Floating-Point Number Support
- Compared to Open-Source Toolchains
Transparent Debug Symbol Handling
- Debug Symbols: No Runtime Overhead
- Centralized Package Database
- Fuzzy Matching Debug Symbols

Photo by Yichun Zhang

The Language Syntax (Continued)
- String Literals
- Built-in Regex Support
- Full Control-Flow Support
- Floating-Point Number Support
- Compared to Open-Source Toolchains
Transparent Debug Symbol Handling
- Debug Symbols: No Runtime Overhead
- Centralized Package Database
- Fuzzy Matching Debug Symbols

OpenResty XRay Aug 21, 2023

OpenResty XRay Updated Aug 21, 2023 14 mins read

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 2 of 4)

The Language Syntax (Continued)
- Macros with Extensions
- Tracer and Tracee Spaces
- Probes
- Extended Variable Types

Photo by Yichun Zhang

The Language Syntax (Continued)
- Macros with Extensions
- Tracer and Tracee Spaces
- Probes
- Extended Variable Types

OpenResty XRay Jul 10, 2023

OpenResty XRay Updated Jul 10, 2023 14 mins read

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 1 of 4)

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

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 Jan 14, 2023

OpenResty XRay Jan 14, 2023

Automatic Analysis Reports in OpenResty XRay

Photo by Yichun Zhang

The Past
The Present
The Future

OpenResty XRay Nov 12, 2021

OpenResty XRay Nov 12, 2021

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 1 of 4)

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

OpenResety Edge Apr 10, 2024

OpenResety Edge Apr 10, 2024

Accurately Restore the Real Client IP Address in OpenResty Edge

Photo by Yichun Zhang

Set “Trusted hosts to set real IP” and “Real IP from” Globally
Configure the Application to Output the Client Address
Check the Client Address Received on OpenResty Edge
What is OpenResty Edge

OpenResty XRay Apr 4, 2024

OpenResty XRay Apr 4, 2024

Use C++ to Dynamic-Trace C++ Applications

Photo by Yichun Zhang

Setting Up the Target C++ Program
Crafting the C++ (or Y++) Analyzer
Operationalizing the Target and Analyzer
Advancing Support for Complex C++ Applications
About the Debug Symbols

OpenResty XRay Apr 1, 2024

OpenResty XRay Apr 1, 2024

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

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

Problem: high CPU usage
Spot the CPU-hottest Erlang code paths
Automatic analysis and reports
What is OpenResty XRay

OpenResty XRay Mar 30, 2024

OpenResty XRay Mar 30, 2024

How to Trace Exceptions inside Perl Applications (using OpenResty XRay)

How to Trace Exceptions inside Perl Applications (using OpenResty XRay)

How to detect and analyze exceptions inside Perl applications
Automatic analysis and reports
What is OpenResty XRay

OpenResty XRay Mar 27, 2024

OpenResty XRay Mar 27, 2024

Analyze OpenResty/Nginx Applications without Debug Symbols (using OpenResty XRay)

Analyze OpenResty/Nginx Applications without Debug Symbols (using OpenResty XRay)

Problem: Debug Symbols are missing
Automatically Analyze and Rebuild Debug Symbols
Automatic analysis and reports
What is OpenResty XRay

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