the efficiency of STRUCTURE on SGI IRIX


Hi, folks
recently I've been working on a project dealing with large amount of
data on a IRIX machine with f77.

the data was organised hierarchically as following:

1 524
1 34 54556 6457 74576 74547
2 32 34454 53445 4354 54345
3 31 34344 56784 56433 4566
.. .. ...........................................
524 32 43545 64556 654 2323
2 345
1 23 23345 34367 5323 5467
2 32 545 34667 45342 54667
.. .. ...........................................
345 23 445 65768 76566 342
3 234
.. ...
..
..
8564021 0


you've noticed that the two-number line indicates that it is the head
of the group with the first being the id and the second the number of
sub groups within it.

since I have to make very complex modifications including shuffling
thoes sub group member's between the large group accroding to some
requirements, I want to construct a STRUCTURE array which is more
easy to handle "theoretically".

here comes the problem, since there are a large amount of groups
here, about 10**6, and the number of sub groups diversifies between 0
and 10**3, just like a pyramid. There is no way to allocate mem in
f77 for prededining array, I wonder if the speed of i/o of these
strucs be very slow comparing to defining many separated arrays?

Thanks, hope I've made myself clear

Merry Xmas :)
--

Don't forget your dreamS
.

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