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How do you do Load Testing and Capacity Planning for Web Sites

I've seen tutorials saying they can run decent websites on 64MB RAM (Debian/Lighttpd/PHP/MySQL) however it's not clearly defined how much hits/traffic a "decent" site gets.

Is there a rule of thumb on how much RAM a web server needs? To keep things simple, let's say you're running a site with static content and it's averaging at 100,000 hits per hour (HTML + images combined, no MySQL). How much RAM is the minimum requirement for that?

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marked as duplicate by Chris S Sep 21 '12 at 20:12

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MySQL is a memory hog, even at it's smallest configuration it's going to take up more than half of that 64MB. –  Chris S Sep 21 '12 at 20:11
    
@ChrisS Thanks for pointing out duplicate, it's actually a good duplicate. –  IMB Sep 21 '12 at 20:24

1 Answer 1

You need to determine the average page size for your site that is being served. Then determine, on average, how many unique pages are being presented to users at a time. From there, it's simple multiplication.

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