Whats new in version 5.5.20:General CUDA:
• MPS (Multi-Process Service) is a runtime service designed to let multiple MPI (Message Passing Interface) processes using CUDA run concurrently on a single GPU in a way that\'s transparent to the MPI program. A CUDA program runs in MPS mode if the MPS control daemon is running on the system. When a CUDA program starts, it connects to the MPS control daemon (if possible), which then creates an MPS server for the connecting client if one does not already exist for the user (UID) that launched the client.
• With the CUDA 5.5 Toolkit, there are some restrictions that are now enforced that may cause existing projects that were building on CUDA 5.0 to fail. For projects that use -Xlinker with nvcc, you need to ensure the arguments after -Xlinker are quoted. In CUDA 5.0, -Xlinker -rpath /usr/local/cuda/lib would succeed; in CUDA 5.5 -Xlinker "-rpath /usr/local/cuda/lib" is now necessary.
• The CUDA Sample projects have makefiles that are now more self-contained and robust.
Publisher review:CUDA Toolkit is a C language development environment for CUDA-enabled GPUs especially designed for OS X.
In a short span of time, the programmable graphics processor unit has
progressed into an complete computing workhorse.
Thanks to high memory bandwidth and multiple cores, today's GPUs provide extraordinary resources for graphics and non-graphics processing.
The impressive evolution can be explained by the fact that the GPU is specialized for compute-intensive, highly parallel computation precisely what graphics rendering is about and as a result its designed allows for more transistors to be devoted to data processing rather than data caching and flow control.
The CUDA development environment includes:
· CUDA runtime driver
· gdb debugger for the GPU
· CUDA FFT and BLAS libraries for the GPU
· nvcc C compiler
· Profiler
· CUDA programming manual
Operating system:Mac OS X
CUDA Toolkit 5.5.20 details 
