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The web server used is Apache, which generates dynamic web pages based on data from the MySQL database. The database holds anywhere from 5-10 million rows of data at any given time! Caching data plays a key role in keeping performance at acceptable levels for the users. The requests are generally for the same lumps of data, potentially requesting thousands of rows of data initially, which must be aggregated together and summarized down to something that is human-readable. Even though this is a production server, it was taken out of the loop long enough to run some performance comparisons before and after adding in the extra gigabyte of memory. Instead of using synthetic benchmark programs, which don't really reflect what this server does day-to-day, I chose to use a program called siege. Here's a quick quote from the author's site about siege:
Siege is very configurable, settings like concurrent users and repetitions allow you to simulate an entire day's traffic in just a matter of seconds (hence the name "siege"), so one must be careful using this tool as it can be very easy to overload a server. Also instead of requesting just a single page from the server, a file can be created with a list of URLs to request during the test, thus making it more accurate of a simulation of real (and random) traffic.
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