Php – Performance differences running PHP under Windows/IIS 7 vs. Linux/Apache

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There is a PHP application right now on a Linux box running under Apache with MySQL. Since we are a windows shop, management wants to get rid of the Linux box and move everything over to windows. Is there a performance difference between the two platforms? Or, is there any significant difference at all, in terms of performance or management?

Best Solution

Microsoft had a team help out optimising PHP for Windows, which work is part of PHP 5.3. Some figures I've seen places the performance close to PHP + Apache on a unix system. Before 5.3 (Which means currently, since 5.3 isn't out yet), performance is bad on Windows. I think there are some patches and tricks you can pull to improve it, but it's going to cost you a bit of performance. That may or may not be a problem; People have a tendency to overestimate performance.

Note that there are other reasons to use unix than just performance. Code may not be portable and even though the core php runs fairly ok, you can well get into trouble with php-extensions and third party libraries. No matter how you look at it, Windows is a second-rate system for running php on.