Since UPC is an explicit parallel extension of ISO C, all language features of C are already embodied in UPC. Thus, a thread and the data that has affinity to it can likely be mapped by the system into the same physical node. The idea is to make UPC enable the programmers, with proper declarations, to keep the shared data that will be dominantly processed by a given thread associated with that thread. The shared space, however, is logically divided into partitions each with a special association (affinity) to a given thread. The total number of threads is THREADS and each thread can identify itself using MYTHREAD, where THREADS and MYTHREAD can be seen as special constants. A number of threads work independently and each of them can reference any address in the shared space, but only its own private space. Under UPC, memory is composed of a shared memory space and a private memory space. Synchronization primitives and a memory consistency model.In order to express parallelism, UPC extends ISO C 99 with the following constructs: UPC uses a Single Program Multiple Data (SPMD) model of computation in which the amount of parallelism is fixed at program startup time, typically with a single thread of execution per processor. The programmer is presented with a single shared, partitioned address space, where variables may be directly read and written by any processor, but each variable is physically associated with a single processor. The language provides a uniform programming model for both shared and distributed memory hardware. Unified Parallel C (UPC) is an extension of the C programming language designed for high performance computing on large-scale parallel machines.
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