HUGE performance increases with PHP on Windows 2008

One of our local developers Dallas J Clark (Brisbane local) blogged about an article that shows PHP with a 130% performance increase on Windows Server 2008 - and of course there have been a few comments asking about the metrics of the comparison etc. So naturally I'm wading into to try and clear the water..

I have to agree that there are a lot of unknowns and its difficult to do a competitive comparison with such little comparative data. What needs to be understood as that the results are for a specific case that the customer experienced, see the case study right here.

The facts are that Microsoft has spent a lot of time working with Zend to ensure that PHP has been engineered to run well on Windows.

The key difference to understand here is that you need to understand the execution architecture differences between *nix vs Windows, respectively multi-process vs multi-threaded. As CGI is designed for multi-process execution this can give pretty ordinary performance on Windows due to the threads/cycles involved in spinning up processes every time a request is processed by the web server. Of course you could attempt multi-threading using the ISAPI filter but ask what the results were from anyone who has tried :) – especially when you are not using code you have written all yourself – thus the best way to ensure reliable performance on Windows is to run via CGI – which of course the performance is not optimal.

Now how has this changed; IIS 7 has a FastCGI module as part of its install which by its design will make anything CGI based run faster, the idea being that it allows you to process multiple requests in the one connection and once the script has been processed the FastCGI process will keep running, waiting for more requests until its spun down as part of the web server.  So in this case using PHP, it eliminates the constant overhead of loading PHP into memory each time a request needs to be processed or course increasing the speed of the request.

Also there are the “NTS” non thread safe windows binaries of PHP that are available off the php.net site - These binaries allow you to execute your code without needing to wait for thread synchronisation, meaning a HUGE performance increase. Couple this with FastCGI then you are you going to experiencing PHP running at a speed never before possible.

To test this I ran a little test, for metrics sake this is Windows Server 2008 Enterprise running in Virtual PC 2007 - allocated 512MB of RAM. The host machine is a HP Compaq Laptop

nc8430 Core 2 Duo @ 2.16Ghz and 4GB RAM, with a 7200 rpm disk, running Vista of course. My methodology was to grab a simple PHP site, run PHP with the standard CGI Module run a performance test, then change handler mapping to run the FastCGI Module and run the same performance test. The site I tested was on Qdig and performance tests were using the Web Capacity Analysis Tool (WCAT). The metric measured was Get Requests / second, because this is an indication of how long the requests are taking before they need to be queued by the web server.

On the left - NTS PHP with CGIModule - maximum approx 30 rps

On the right - NTS PHP with FastCGIModule - maximum approx 870 rps

Of course your mileage will vary, but you will have a comparable or better experience than on other platforms.

Questions?

-jorke

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