* The incident * Process of resolution * Hardening after the incident * OpenResty XRay Services
Yichun Zhang
* The incident * Process of resolution * Hardening after the incident * OpenResty XRay Services
* 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
Yichun Zhang
* 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 * 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
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
* 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
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
* 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
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
* The Language Syntax (Continued) * Macros with Extensions * Tracer and Tracee Spaces * Probes * Extended Variable Types
Yichun Zhang
* The Language Syntax (Continued) * Macros with Extensions * Tracer and Tracee Spaces * Probes * Extended Variable Types
* What is Dynamic Tracing * Why the "Y" Name * Getting Started * Various Backends and Runtimes * Why a Unified Frontend Language * The Language Syntax
Yichun Zhang
* What is Dynamic Tracing * Why the "Y" Name * Getting Started * Various Backends and Runtimes * Why a Unified Frontend Language * The Language Syntax
* What is a Flame Graph * Simple Lua samples * Complicated Lua applications * Sampling overhead * Safety * Compatibility * Other types of Lua-land Flame Graphs
Yichun Zhang
* What is a Flame Graph * Simple Lua samples * Complicated Lua applications * Sampling overhead * Safety * Compatibility * Other types of Lua-land Flame Graphs
* An empty zone * Filling entries of similar sizes * Deleting odd-numbered keys * Deleting the keys in the first half * Mitigating Fragmentation
Yichun Zhang
* An empty zone * Filling entries of similar sizes * Deleting odd-numbered keys * Deleting the keys in the first half * Mitigating Fragmentation
* Slabs and pages * What is allocated is not what is paid for * Fake Memory Leaks * HUP reload
Yichun Zhang
* Slabs and pages * What is allocated is not what is paid for * Fake Memory Leaks * HUP reload
Yichun Zhang
* Applications of SystemTap in Production * Case #1: Slow Debugging Code Left in Production * Case #2: Long request latency outliers * Case #3: From Network Issues to Disk Issues * Case #4: File Handle Cache Tradeoffs * Case #5: Compiled Regex Cache Tuning
Yichun Zhang
* Applications of SystemTap in Production * Case #1: Slow Debugging Code Left in Production * Case #2: Long request latency outliers * Case #3: From Network Issues to Disk Issues * Case #4: File Handle Cache Tradeoffs * Case #5: Compiled Regex Cache Tuning
* DTrace * SystemTap * DTrace and SystemTap
Yichun Zhang
* DTrace * SystemTap * DTrace and SystemTap
* Dynamic Tracing * What It Is * Too Good to be True? * How it Works * Still Having Doubts? * The Advantages of Dynamic Tracing
Yichun Zhang
* Dynamic Tracing * What It Is * Too Good to be True? * How it Works * Still Having Doubts? * The Advantages of Dynamic Tracing
* On The System Level * On The Application Level * For Traditional Nginx Servers
Yichun Zhang
* On The System Level * On The Application Level * For Traditional Nginx Servers
OPENRESTY XRAY Nov 12, 2021
OPENRESTY XRAY Nov 12, 2021
* 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
* 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
* 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
* 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
* On The System Level * On The Application Level * For Traditional Nginx Servers
OPENRESTY XRAY Aug 24, 2022
OPENRESTY XRAY Aug 24, 2022
* The incident * Process of resolution * Hardening after the incident * OpenResty XRay Services
OPENRESTY XRAY Jul 14, 2022
OPENRESTY XRAY Jul 14, 2022
* 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
* 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
* 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
