How fast vos_join is and how much memory does it's used
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o input file size 1 (already sorted)	: 40,499,908
o input file size 2 (already sorted)	: 40,499,908

o input rows		: 501,000
o input fields		: 11
o output fields		: 22

o process max row	: 100,000
o process max		: 2
o file buffer size	: 8192 bytes


2009.01.18 - test 000
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o allocs			: 24,048,866
o bytes allocated		: 417,724,740 (~ 5 * inputs file size)
o running time (w/o memcheck)	:

	real    0m9.118s
	user    0m8.483s
	sys     0m0.237s


2009.01.18 - test 001
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o with new vos_join algorithm
o allocs			: 542
o bytes allocated		: 42,134 (~ 0.2 * inputs file size)
o running time (w/o memcheck)	:

	real    0m5.336s
	user    0m4.833s
	sys     0m0.333s