By Tarek El-Ghazawi, William Carlson, Thomas Sterling, Katherine Yelick
This is often the 1st e-book to provide an explanation for the language Unified Parallel C and its use. Authors El-Ghazawi, Carlson, and Sterling are one of the builders of UPC, with shut hyperlinks with the economic contributors of the UPC consortium. Their textual content covers historical past fabric on parallel architectures and algorithms, and contains UPC programming case experiences. This ebook represents a useful source for the turning out to be variety of UPC clients and purposes builders.
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Additional info for Upc: Distributed Shared Memory Programming
The address ﬁeld will be printed in 10 hexadecimal digits, while the thread number and the phase numbers will be printed in two decimal digits each. 6 sets buffer_ptr to point to the last element in the second block buffer . Therefore, the printed thread number should be 1 and the phase should be 2. The address value is implementation-dependent, however. In addition to the functions that return the three different elements of a pointerto-shared, the function shared void *upc_resetphase (shared void *ptr); returns a pointer-to-shared which is identical to ptr except that it has a phase of zero.
As the loop for(i=MYTHREAD; i < THREADS*10; i+=THREADS) is executed by all threads concurrently in SPMD style, each thread operates at ﬁrst on the row of matrix a  that matches the thread number. Then each thread PARALLEL ITERATIONS 51 jumps by THREADS row to work with its next row, and so on, until all 10 rows are processed. In performing the operations above, it should be noted that each thread operates on the a-elements that are local to it only. Thus, the inherent locality in the underlying problem is fully exploited.
For simplicity, however, we say that the ﬁrst element goes to thread 0, the second to thread 1, and so on. The following example declarations demonstrate how a shared vector declaration behaves compared to shared scalar and private scalar declarations. 3, where x and y were created in the shared space, and instances of z were created in the private spaces of each thread. Thus, if the declaration shared int y [THREADS]; was replaced with int y [THREADS]; each thread would have had its own full four-element private version of the array y.
Upc: Distributed Shared Memory Programming by Tarek El-Ghazawi, William Carlson, Thomas Sterling, Katherine Yelick
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