Tcl in AOL Digital City The Architecture of a Multithreaded High-Performance Web Site

2/16/00


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Table of Contents

Tcl in AOL Digital City The Architecture of a Multithreaded High-Performance Web Site

Welcome To Digital City

You Just…

Overview

AOLserver and Multithreaded Tcl

AOLserver Background

AOLserver Basics

AOLserver Tcl

AOLserver Tcl Model

Example: CGI-style Request Procedures

Example: Database Access

Example: Background Tasks

Example: AOLserver Dynamic Pages

Example: Simple ADP Template

Example: ADP Debugging

AOLserver Multithreaded Tcl

What is Multithreading?

What You’ll Want to Know

What You Can Generally Ignore

Why Are Threads Good?

Example: Event-Driven vs Thread I/O

Why Threads May Be Bad

Multithreaded Tcl

Multithreaded Tcl - Mutex Protection

Multithreaded Tcl - Thread Local Storage

Multithreaded Tcl - Event Loop

Tcl 8.2 Multithreading Issues

AOLserver Multithreaded Tcl

Multithreaded Tcl Interp Initialization

AOLserver Tcl Interp Initialization

First Solution: Interp Pools

First Solution: Interp Pools

Second Solution: Direct Sharing

Second Solution: Direct Sharing

Latest Solution: Interp Cloning

Latest Solution: Interp Cloning

AOLserver Multithreaded Tcl Examples

Example - Creating Threads

Example - Sharing Memory

Example - Simple Cache

Example - Real Cache

Putting AOLserver To Use

The Digital City Platform

What is Digital City?

The Digital City Challenge

And Digital City Must Scale

The Digital City Architecture

Digital City Servers

Some Numbers...

Examples

Example: NV

Example: NV

Example: Proxy

Example: Proxy

Example: Sob

Example: Sob

Sob-Powered Publishing Tools

Extensions Working Together

MovieGuide

MovieGuide Features

MovieGuide Components

MovieGuide 1.0

MovieGuide 1.0 Issues

MovieGuide 2.0

MovieGuide 2.0 Issues

MovieGuide 3.0

MovieGuide 3.0 Success

Monitoring Performance

URL Stats

Tcl Statistics

Anything Specific to Multithreading?

Cache Statistics

Lock Contention

Overall Performance

Wrap Up

Who Developed and Operates Digital City?

Where To Get More Information

Author: Jim Davidson

Email: jgdavidson@aol.com

Other information:
Slides from the Tcl/2k Conference