Message 134995 - Python tracker

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This is a very interesting patch, thank you.
I've tested it on Mandriva 64-bit and it indeed fixes the free() issue on the XML workload. I see no regression on pybench, stringbench or json/pickle benchmarks.

I guess the final patch will have to guard the mallopt() call with some #ifdef?
(also, I suppose a portable solution would have to call mmap() ourselves for allocation of arenas, but that would probably be a bit more involved)