Does anyone know how to measure maximum limit or allow range size for constant,local.private,global memory
i use gpu caps viewer tool for cl info and get the result
https://www.dropbox.com/s/lb1y94njg5y37jv/4.jpg
Global memory = 2048 MB,
Local memory =32 KB,
constant memory =64 KB,
is that means maximum memory size
the open-cl device info https://www.dropbox.com/s/2fr827ikcrjvoe0/new%20%204.txt
Query the device properties with clGetDeviceInfo() OpenCL Doc
The values you want are:
Global - CL_DEVICE_GLOBAL_MEM_SIZE - Total maximum mem size the device can hold
Local - CL_DEVICE_LOCAL_MEM_SIZE - Local group temporal shared max mem size
Constant - CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE - Constant arguments max mem size
Private is impossible to query, and depends on many things like the code and work size, just use as little as you can.
This is fairly easy using the Boost.Compute C++ wrapper library for OpenCL:
// get the default device
boost::compute::device device = boost::compute::system::default_device();
// print out memory sizes
std::cout << "device: " << device.name() << std::endl;
std::cout << " global memory size: "
<< device.get_info<cl_ulong>(CL_DEVICE_GLOBAL_MEM_SIZE) / 1024 / 1024
<< " MB"
<< std::endl;
std::cout << " local memory size: "
<< device.get_info<cl_ulong>(CL_DEVICE_LOCAL_MEM_SIZE) / 1024
<< " KB"
<< std::endl;
std::cout << " constant memory size: "
<< device.get_info<cl_ulong>(CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE) / 1024
<< " KB"
<< std::endl;
Which will print something like this:
device: Tahiti
global memory size: 2511 MB
local memory size: 32 KB
constant memory size: 64 KB
See the memory_limits.cpp example for the full source code.
