1/31/2024 0 Comments Berkeley upc shared array blockThe shared data with the same a nity are assembled as a one-dimensional array such that all local objects are next to each other physically. Thread-major follows a typical translation of a UPC compiler for a distributed shared memory system. Note all of the above use an indefinitely-blocked pointer-to-shared for accessing the elements with affinity to a single thread, since each block is logically one contiguous chunk of data with no wrapping across threads. We implement two memory layouts for a shared array: threadmajor and block-major. This allows the program-mer to traverse the array in a logical way. Here threadptr is a local array of pointers serving as a directory of references to each thread's data. A shared pointer is usually composed ofthree elements: thread:thread a nity of the point-ed data, virtual address:address of the currentelement in the local space andphase:position in-side the current block. Threadptr = 42 /* example access to element 10 on thread 4*/ However if you really want that you can certainly declare and initialize one with something like this: shared int *threadptr įor (int i=0 i < THREADS i++) threadptr = (shared int *)(base+i) ![]() With this approach you never need to instantiate storage for an array of THREADS pointers. Then you can use the cyclic base pointer to create a pointer-to-shared referencing the data with affinity to thread X with an expression like: shared int *threadXdata = (shared int *)(base+X) Unified Parallel C (UPC) is a Partitioned Global Address Space (PGAS) language whose popularity has increased during the last years owing to its high programmability and reasonable performance through an efficient exploitation of data locality, especially on hierarchical architectures like multicore clusters. Shared int table /* data automatically blocked across THREADS */ Cyclically distributed 1D array (block size is default to 1) shared uint64t TableTableSize. ![]() Assuming you are using the static-threads compilation environment, a more succinct way to declare your array would be something like this: #define SIZE 10000 For example, Berkeley UPC extensions are available at.
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