# Parallel Sorting Algorithms by Selim G. Akl download in pdf, ePub, iPad

In fact, there are techniques that can make the initial runs longer than the available internal memory. Otherwise, we don't actually need to perform the partitioning and use the introspective algorithm to sort the entire array. The data items which values are equal to the value of pivot remain at their original positions. If you are interested, you may use or peruse my Java code for each of these algorithms.

However, to optimize the performance at the algorithm level, we can use the more sophisticated methods for finding the value of pivot data item. The issue is to save some time by doing various sub-merges simultaneously. Write and check the merging algorithm through the use of a small main code. Actually, this is not a conventional sorting algorithm. One of the most popular methods include the median-of-three and median-of-nine algorithms that we're about to discuss in this section.

During the following stage we're performing one more additional check to determine if the array to be sorted consists of the large number of data items which values duplicate. Then we need to compute the value of radix i. Otherwise, if the current data item's value is less than the value of pivot, we're exchanging the following item with the data item we've stepped into from the left. Parallel Quicksort Algorithm In its simplest form, the parallel implementation of the Quicksort Algorithm can be similar to that of the Bubble Sort. To do this, we first perform an array pre-sorting by using the adjacent sort, during which we actually sort adjacent neighbor data items.

In the most cases the value of median is the middle or average value of all items in the array. Just to provide a maximum reliability of the process of sorting we iteratively perform the last chance check if the entire array has already been sorted. If the initial order of the array is not reverse, we simply bypass any sorting and go to the next step of the algorithm. After that, we're using the same median-of-three algorithm for each group of three values stored into the temporary location, and, as the result, obtain the three different values of median, so far. Bing-Chao Huang and Michael A.

The average value is normally greater than the minima and less than maxima of these three values. Finally, we're also about to discuss the sorter function recursive calls optimization that benefits in the lowered recursion depth and thus more performance speed-up of the entire process of sorting. Then, we're performing a series of iterations during which we're incrementing the value of a loop counter variable by the value of actual size of each chunk, previously computed. Perform a check if the radix i.

To compute the median of the array that consists of the odd number of item, all what we need is to take the value of data item located in the middle. The classical quicksort algorithm proposed by Tony C. After that we're performing a check if the potential size of the array is greater than the sorting process cutting off boundary. Perform a check if size of the array to be sorted is greater than the upper cutting off boundary. If so, we perform the partitioning of the array by using classical quicksort partitioning scheme.

Sub-lists lead to a paralization of the merging of data. The step avoids many early passes. This is typically done by initially performing a search to find the data item with maximum value in the array to be sorted.

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