veyepar: Optimizing Web Performance with TBB

Author(s):	Nicolas Erdody,Lenz Gschwendtner
Location	T101
Date	jan Tue 17	Days Raw Files
Start	10:30	First Raw Start	error-in-template
Duration	0:50:00	Offset	None
End	11:20	Last Raw End
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http://lca2012.linux.org.au/schedule/196/view_talk
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Threading Building Blocks (TBB) is a C++ threading library that makes multicore programming more accessible. We considered TBB for web application developers working in script languages.

Many websites require a non-trivial amount of per-request processing in the application layer, to retrieve, consolidate or manipulate data. Achieving better performance at this level improves response times and the overall user experience. Parallelising access to database and web service back-end layers can yield substantial improvements in perceived performance.

We added TBB support into PHP and Perl, starting with HipHop as the PHP implementation of choice and later adding Perl support.

HipHop is a PHP to C++ cross compiler that was developed by Facebook to cut down on resource needs and speed up the execution times of their gigantic web infrastructure. HipHop project is a PHP implementation thread safe and already uses TBB for memory management.

We started by extending the existing support and added first only the new *parallel_for* function. Later, we added concurrent data structures and re-implemented our first approach. We have now a robust implementation of *parallel_for* and *parallel_reduce* with the data structures needed to support them.

In our work with the PHP HipHop compiler we also wrote a patch set for WordPress and enhanced WordPress with our new *parallel_for* language extension. This trial brought us instant success in reduced page load times. The patch set for WordPress only replaced some key *foreach* loops with *parallel_for* and was our first real success with the TBB library in PHP.

The Perl project worked towards a Perl module that can be used to get access to TBB functions directly. The module is now stable enough to demonstrate the gain by using TBB in Perl. Demos of our work are running on geopic.me

Threading interpreters bury they own set of challenges but we can get further by using TBB. The libraries we produced so far will be further developed and maintained. We will continue working on both platforms to expose the power of multicore CPUs to developers in an approachable way.

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