Compelling examples of custom C++ allocators?

by

As I mention here, I’ve seen Intel TBB’s custom STL allocator significantly improve performance of a multithreaded app simply by changing a single 

std::vector<T>

to 

std::vector<T,tbb::scalable_allocator<T> >

(this is a quick and convenient way of switching the allocator to use TBB’s nifty thread-private heaps; see page 7 in this document)

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