Surviving Slashdot

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Information about Surviving Slashdot

Published on July 18, 2007

Author: johnbuckman

Source: slideshare.net

Description

Technical presentation from 2005 about how to make your web site survive slashdot/digg style mega load.

Surviving Slashdot: How to plan for the deluge.

Magnatune’s architecture: linux/apache/mysql/php

What happened when Slashdot hit.

1. Thousands of Apache processes

2. Http Servers unresponsive

3. Http Audio Streaming not fast enough for real time

Analysis & Solutions

Why is Yahoo so “snappy” ?

By default, Web browsers ask for every image on every page with “If-Modified-Since”.

Ironically, lots of small graphics on a web page is the least efficient use of HTTP.

What if you could make browsers not ask for images that are unchanging?

Trick #1: use “Expires” HTTP header on static graphics: Expires: Thu, 15 Apr 2010 20:00:00 GMT

I did this by hacking the C source code to my HTTP server.

Is there a fast Apache way to add an Expires: header when returning GIF/JPEGs?

next problem...

In many cases, HTTP performance is constrained by the receiver, not the sender.

Large files take a long time to be downloaded by the requestor.

Each download uses up an Apache process.

Apache Bench shows great large-file performance.

But Apache Bench isn’t a useful metric with large files in the real world.

The problem is the “fork” based architecture of Apache.

Thread-based HTTP servers have the same problem.

Apache has an experimental “async” mode -- this may be a solution in the future.

Trick #2: Use a dedicated async- based HTTP server for large files.

next problem...

PHP is handy. But PHP is slow.

Apache Bench Speed tests: PHP: 9 pages/sec HTML: 250 pages/sec

Trick #3: Statically cache most PHP pages into HTML.

Use Apache “MultiViews” option.

URLs shouldn’t include .php or .html

ie: http://x.com/mypage could be PHP or HTML, doesn’t matter.

Have a script regularly HTTP GET most PHP files, save as HTML and delete the PHP.

Yields a 25x speed increase.

end

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