The library is an evolution of the popular GASNet communication system, building upon over 15 years of lessons learned. GASNet-EX is a portable, open-source, high-performance communication library designed to efficiently support the networking requirements of Partitioned Global Address Space (PGAS) runtime systems and other alternative models in future exascale machines. Finally, we analyze the performance of our compiler on some benchmark programs and show that, while there are some limitations of the current compilation approach, the Berkeley UPC compiler uses the X1 network more effectively than MPI or SHMEM, and generates serial code whose vectorizability is comparable to the original C code. We discuss several difficulties encountered in the Cray C compiler which are likely to present challenges for many users, especially implementors of libraries and source-to-source translators. As part of our implementation effort, we evaluate the X1's more » hardware support for GAS languages and provide empirical performance characterizations in the context of leveraging features such as vectorization and global pointers for the Berkeley UPC compiler. high performance compiler for Unified Parallel C (UPC), a SPMD global-address space language extension of ISO C. In this paper, we describe our experience with developing a portable, open-source and. Alongside capabilities such as automatic fine-grained data parallelism through the use of vector instructions, the X1 offers hardware support for a transparent global-address space (GAS), which makes it an interesting target for GAS languages. The Cray X1 was recently introduced as the first in a new line of parallel systems to combine high-bandwidth vector processing with an MPP system architecture. This software package has been replaced with UPCC++ V 1.0 « less In particular, we use templates and operator overloading to customize the behavior of UPC++ types. The UPC++ front-end consists of a set of C++ header files that enables the C++ compiler to "translate" UPC++ features in a user program to runtime library calls. We implemented UPC++ with a "compiler-free" approach using C++ templates and runtime libraries. UPC++ provides two programming constructs for specifying dynamic dependencies among tasks: 1) event-driven execution as in Phalanx and Habanero-C 2) finish-async as in X10. The user may start an asynchronous remote function invocation with the following syntax: "async(place)(function, args.) ". 2) Another feature provided by UPC++ but not by UPC is remote function invocation, which is inspired by Phalanx, X10, Habanero-C, and C++11. Titanium's library is similar to Chapel's dense and strided domains, as both were inspired by the dense and strided regions and arrays in ZPL. To remedy this problem in UPC++, we included a multidimensional domain and array library based on that of Titanium. UPC++ includes two main features beyond UPC: 1) One of the major limitations of UPC in the context of DOE application is the relatively more » weak notion of multidimensional arrays, which it inherited from C. UPC++ is a Partitioned Global Address Space (PGAS) extension for C++, with three main objectives: 1) to provide an object-oriented PGAS programming model in the context of the popular C++ language 2) to add useful parallel programming idioms unavailable in UPC, such as asynchronous remote function invocation and multidimensional arrays, to support complex scientific applications 3) to offer an easy on-ramp to PGAS programming through interoperability with other existing parallel programming systems (e.g., MPI, OpenMP, CUDA).
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