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copied!<p>Like many comparative questions here, you'll probably need to come up with a benchmark to really determine whether that's true.</p> <p><a href="http://www.lesswatts.org/projects/applications-power-management/index.php" rel="nofollow noreferrer">lesswatts.org has a bit of information on applications power management</a>, as well as several other aspects of power consumption on Linux systems. As a side note, they seem to be using PHP, so that might be worth something in itself :)</p> <p>They keep repeating that you should use <a href="http://www.lesswatts.org/projects/powertop/index.php" rel="nofollow noreferrer">PowerTOP</a> to determine which applications are causing the most power consumption, and you can see from the screenshot that they are checking wakeups from idle, at least.</p> <hr> <p>Most of the time, a web server is sitting idle, then it "serves" for a very brief moment, then it goes back to waiting for the next connection to serve. In that regard, PHP would contribute very little to the entire process: only the serving portion. So I wonder if the actual benchmark was a comparison of a particular Java-based web server vs. Apache/PHP serving similar pages. If that was the case, it's not really a fair comparison of PHP and Java -- either of the two considered as serving an actual page is only active for milliseconds at a time, typically. I would think the actual web server, the one who's selecting or polling connections, is the one that would be hogging power.</p>

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