Computing downwards accumulations on trees quickly
Downwards passes on binary trees are essentially functions which pass information down a tree, from the root towards the leaves. Under certain conditions, a downwards pass is both 'efficient' (computable in a functional style in parallel time proportional to the depth of the tree) and ...
| প্রধান লেখক: | |
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| বিন্যাস: | Journal article |
| ভাষা: | English |
| প্রকাশিত: |
1996
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| সংক্ষিপ্ত: | Downwards passes on binary trees are essentially functions which pass information down a tree, from the root towards the leaves. Under certain conditions, a downwards pass is both 'efficient' (computable in a functional style in parallel time proportional to the depth of the tree) and 'manipulable' (enjoying a number of distributivity properties useful in program construction); we call a downwards pass satisfying these conditions a downwards accumulation. In this paper, we show that these conditions do in fact yield a stronger conclusion: the accumulation can be computed in parallel time proportional to the logarithm of the depth of the tree, on a CREW PRAM machine. |
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