Unified Parallel C (UPC) is an extension of the C programming language designed for high performance computing on large-scale parallel machines. The language provides a uniform programming model for both shared and distributed memory hardware.

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.

UPC uses a Single Program Multiple Data (SPMD) model of computation in which the amount of parallelism is fixed at program startup time, usually with a single thread of execution per processor.

In order to express parallelism, UPC extends ISO C 99 with the following constructs:
· An explicitly parallel execution model
· A shared address space
· Synchronization primitives and a memory consistency model
· Memory management primitives UPC combines the programmability advantages of the shared memory programming paradigm and the control over data layout and performance of the message passing programming paradigm.

Berkeley UPC is a high-performance, portable and fully open-source implementation of the UPC language designed for large-scale multiprocessors, PC clusters, and clusters of shared memory multiprocessors.

Berkeley UPC is the first UPC implementation available for Mac OS X, and delivers competetive performance for supercomputing applications on the largest OS X clusters in the world, yet also provides support for UPC code development on Mac OS X laptops and desktop workstations.

Requirements:

· For OSX 10.4 you need XCode Tools v2.x, for OSX 10.3 you need v1.x

What's New in This Release: [ read full changelog ]

· Enhancements/improvements to upcrun (see the upcrun manpage)
· Fix bug 2432: errors induced by certain uses of #include
· Enhancements/improvements to upcc (see the upcc manpage)
· Fix bug 2749: link failures with Totalview support on Solaris
· Build/configure changes/improvements
· Enhanced multiconf syntax for more control of sub-configures
· Improved support for LEX != flex (or unavailable)
· Misc changes/improvements in runtime libraries
· Use MALLOC_OPTIONS variable in debug builds on BSD-family O/Ses
· Much improved support for heterogenous compilers (CC, CXX and MPI_CC)
· Shared-memory awarness added to default barrier implementations
· Shared-memory awarness added to Extended API and Collectives
· Improved scalability of CrayXT job startup and termination code
Fixed the following notable bugs in 2.10.0 UPC and GASNet libraries:
· bug 2079: stack overflow errors when vapi/ibv compiled with pgcc
· bug 2685: timers broken on variable-frequency x86_64 CPUs
· bug 2696: (partial fix) build errors with Sun Studi...