How does X10 compare with MPI?
X10 is a higher level programming model than MPI. In general, X10 code should be much more concise than the equivalent MPI. There are at least two major philosophical differences between the MPI programming model and X10: the control flow, and the memory model. The MPI control flow model is SPMD (Single-Program Multiple Data): the program begins with a single thread of control in each process. In contrast, an X10 program begins with a single thread of control in the root place, and an X10 program spawns more threads of control across places using async and at. The MPI memory model is a completely distributed memory model. MPI processes communicate via message-passing. There is no shared global address space in MPI, so user code must manage the mappings between local address spaces in different processes. In contrast, X10 supports a global shared address space. While an X10 activity can only directly access memory in the local Place (address space), it can name a location in a remote pl
