Global Arrays

"Global Arrays (GA) is a Partitioned Global Address Space (PGAS) programming model. It provides primitives for one-sided communication (Get, Put, Accumulate) and Atomic Operations (read increment). It supports blocking and non-blocking primtives, and supports location consistency.

The Global Arrays toolkit consists of many useful and related pieces.

• Communication Runtime for Extreme Scale (ComEx) provides vector and strided interfaces to optimize performance of remote memory copy operations for non-contiguous data.
• ChemIO aka Parallel IO (pario) is a package consisting of three independent parallel I/O libraries for high-performance computers. It was designed for computational chemistry; however, the supported abstractions and features are general enough to be of interest to other applications.
  • Disk Resident Arrays extend the GA Non-Uniform Memory Access (NUMA) programming model to disk.
  • Shared Files to which multiple processors can read and write independently.
  • Exclusive Access Files (EAF) per-processor private files.
• Memory Allocator (MA) is a local memory manager/allocator with several useful features not available in Fortran or C languages.
• Task Scheduling Library (tascel)
• TCGMSG is an efficient but limited in functionality (comparing to MPI) message-passing library available on many current (and legacy) systems.
• TCGMSG-MPI is a portability layer between TCGMSG and MPI. It is recommended as a transition library from TCGMSG to MPI for existing TCGMSG codes.

http://hpc.pnl.gov/globalarrays/index.shtml