GPGPU GPU specification of purpose

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03-23-2011
ashinms

GPGPU GPU specification of purpose

I was reading a little online about GPGPU (specifically OpenCL) and I came across the FASTRA "supercomputer" that was built using four dual gpu graphics cards. Now, I know that at the time of this writing, both CrossfireX and SLI only support up to four GPUs (and probably will for awhile due to diminished returns on that fourth GPU), but this still got me to thinking.... If I win the lottery tomorrow, and build some crazy expensive computer, would it be possible (either through CUDA or OpenCL- I don't care which) to write a GPGPU based program that would.... Say run on my super- awesome GTX580, while I use my other, super- awesome CrossfireX'ed 6990's for gaming (that's a sum total of 5 GPUs, I think- assuming I counted correctly ;) )

I guess what I'm really asking here is, is it possible to specify which GPU you intend for that program to run on in the background, while another runs on a different GPU (or set of GPUs)
03-23-2011
User Name:

See chapter 4.2 on how to get a list of devices, 4.3 how how to create a context, linking those devices as a group, and 5.* on how to use contexts, such as to execute kernels, and the like. If I understand correctly, you could even link all 5 of them.

http://www.khronos.org/registry/cl/s...ncl-1.0.48.pdf

EDIT: Heck man, if I won the lottery, I'd be thinking 7, not 5. http://www.compusa.com/applications/...741&CatId=4070 or, even better, a Xeon machine for multiple processors.
03-23-2011
ashinms

thanks

The link was too large for my blackberry to open, but ill check it out as soon as I can. If anyone else is willing to post some source code I'd give you a cookie. :)

I would definitely go with the SR-2 but you gotta remember there is a revodrive and sound card in the other two slots
03-24-2011
User Name:

Enumerating platforms:

Code:

#include [opencl header here] #include <sstream> #include <string> #define MAX_PLATFORM_IDS 8 using namespace std; int main() { cl_int num_platforms; cl_platform_id *platforms = new cl_platform_id[MAX_PLATFORM_IDS]; // Get list of platforms. if(clGetPlatformIDs(MAX_PLATFORM_IDS, platforIDs, &num_platforms) != CL_SUCCESS) { cerr << "Error: clGetPlatformIDs() returns error" << endl; abort(); } cout << "Available Platforms:" << endl; for(int platform = 0;i < num_platforms;platform++) { char *param_value = new char[256]; string platform_name, platform_vendor, platform_extensions; // Get CL_PLATFORM_NAME if(clGetPlatformInfo(platform, CL_PLATFORM_NAME, 256, param_value, NULL) == CL_SUCCESS) platform_name = param_value; else { cerr << "Error: clGetPlatformInfo() returns error" << endl; abort(); } // Get CL_PLATFORM_VENDOR if(clGetPlatformInfo(platform, CL_PLATFORM_VENDOR, 256, param_value, NULL) == CL_SUCCESS) platform_vendor = param_value; else { cerr << "Error: clGetPlatformInfo() returns error" << endl; abort(); } // Get CL_PLATFORM_EXTENSIONS if(clGetPlatformInfo(platform, CL_PLATFORM_EXTENSIONS, 256, param_value, NULL) == CL_SUCCESS) platform_extensions = param_value; else { cerr << "Error: clGetPlatformInfo() returns error" << endl; abort(); } cout << platform << ":" << endl << "\tPlatform name: " << platform_name << endl << "\tPlatform vendor: " << platform_vendor << endl << "\tPlatform extensions: " << platform_extensions << endl; } return 0; }
03-24-2011
ashinms

<html>

<img src= "http://admin.desktop.ashinms.operaunite.com/webserver/content/Guitar%20Tutorial/Picture%20Files/cookie-monster3-7769871237963363.jpg" />
<html/>

Edit: Okayyy.... didn't work out like I imagined.
03-24-2011
User Name:

[url] then /url in same type of braces.
03-24-2011
ashinms

kay thanks
03-24-2011
User Name:

How is that related anyway?
03-25-2011
ashinms

thread is dead

Ehh... Its not. I said I'd give a cookie to someone who posted some source for me to look at. I've seen what I wanted. Learned what I needed. Thank you very much, but I'm afraid this thread is dead.
03-26-2011
User Name:

In the future, I would suggest a like, over a cookie. I have cookies turned off, anyway. :p