PHP performance: accelerators and HTTP servers

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First, which is the fastest accelerator: XCache or APC? And should I have nginx, lighttpd, Apache or Apache with nginx as a reverse proxy for static contents. What's better?
Thank you.

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Answer

Solution:

There is no general answer on this. It depends on what you need. I always choose APC for new projects. I used XCache but I think APC is better for the following reasons.

Stability: APC is more stable than XCache
Support: You will get more support for APC because there are a lot more users using APC
Support2: There are a lot mor Frameworks and libraries that support APC than XCache
Development: The development of APC is more uptodate than XCache. New PHP-Versions are supported quicker than in XCache

So pure performance is not everything :)

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Answer

Solution:

APC is more user friendly and gives you better hit miss stats. XCache is about the same in performance but not as stable. It really depends on your server and what your running on it. You need to benchmark different scenarios and find your sweet spot. For my WordPress installation on a VPS with 768M Ram I got the best results using an Nginx reverse proxy static cache along with Memcached. Here is the bench to get an idea of what I achieved with this set up:

$ ab -n 1000 -c 100

yielded 1712.33 requests per second

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