dwootton

Unusual OpenCL application termination on Windows 7

Discussion created by dwootton on Jan 16, 2010
Latest reply on Jan 23, 2010 by genaganna

I have the SDK 2.0 installed on a Windows 7 machine and running a program compiled in Visual Studio 2008. I've run into a problem where I run the application and get a popup dialog with a message 'This application has requested the Runtime to terminate it in an unusual way. Please contact the support team for more information.'

If I run the program using the Visual Studio debugger, the debugger does not get control even if I tell it to break on all exceptions. Is there some way to get the debugger to get control in this case?

I think I did figure out why the program is doing this for this particular problem. I set breakpoints on calls to clCreateBuffer.

I allocated 0x03000000, 0x01800000, 0x03000000, 0x01800000 bytes, in that order. At the second allocation of 0x01800000 bytes, I got the crash.

If I allocate smaller blocks of memory in the same sequence I don't get a crash.

I have a 4650 GPU with 512MB memory, so the second allocation of 0x01800000 bytes exceeds the capacity of the card.

Shouldn't the OpenCL runtime return CL_OUT_OF_HOST_MEMORY in this case rather than crashing the program?

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