• 10/30/2018
  • Public Content
Contents

Global Memory Size

OpenCL™ “global” memory is allocated from system (host) memory for CPU. The amount of available memory depends on the amount of computer system memory and the operating system number of bits. For example, a system with 4GB of RAM running on a 32-bit OS usually has less than 3GB available for system memory. This impacts the amount of global memory available for the CPU device. Use the
clGetDeviceInfo(…,CL_DEVICE_GLOBAL_MEM_SIZE)
query to get information on the exact available amount. If you fail to allocate resources required by the OpenCL™ implementation on the device, you receive the
CL_OUT_OF_RESOURCES
error.
Global memory performance depends on the frequency of DDR memory.
Since global memory is shared between CPU and the system host, it is important to use mapping for memory objects. See the Map Memory Objects (USE_HOST_PTR) section for more information.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804