emudebug error CudaMalloc failed in emudebug mode.

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello.

I am using Cuda in an existing project (and so without using templates). I have no problem with release and debug configuration mode but I try to configure my project for emudebug and emurelease.

I have created these 2 new configuration : emudebug based on debug and emurelease based on release mode and for each .cu file added –deviceemu (for these 2 conf.) in the command line.

The compilation is good but the execution fail when I call : CUDA_SAFE_CALL(cudaMalloc((void**) &utVariable, uiSize));

2

Hi Martin,

as I’m stumbling over the same problem - have you had any success in resolving this issue?

if yes, would be nice if you could let me know what the problem was.

Thanks,
Michael

3

anybody else experienced that?

to be more specific, here’s my problem again - execution (not compilation) fails in emuDebug mode (but is fine in normal debug mode) for following line:

CUDA_SAFE_CALL(cudaMemcpy(Data_d, Data_h, size, cudaMemcpyHostToDevice));

note: when calling cudaMemcpy directly (without CUDA_SAFE_CALL), execution succeeds;

what’s more (and this is my real problem), the debugger does not stop at a breakpoint in my kernel in VS

all I changed from Debug to EmuDebug mode was to add the -deviceemu option to the nvcc command line (in the custom build step in VS)

thanks in advance!

4

Unfortunately, I have not success in resolving this issue.
I am always blocked with this problem.

Anabody else??

Thanks,
Benoit

5

You say you’re not using the SDK templates. Did you compare against them very carefully? Are you defining all the right constants? Look at the definition of the CUDA_SAFE_CALL() macro to see what it is doing and what #ifdefs etc. surround it.

6

This isnt related to the problems above, but i fixed my Debug and EmuDebug compilation problems in Visual Studio by removing the
“_DEBUG” from the preprocessor directive under Project Properties → CUDA settings.

7

I see the same peoblem, the system hangs if I add the -deviceemu to the compile option…
…
Does anyone know about the cause for this? Thanks.

8

I’ve had this problem before and errors were saying you cannot mix device and emulation modes. I worked around it by removing the CUDA_SAFE_CALL macros. It would run past that point, but ultimately it was due to one of my linked libraries that wasn’t compiled in emulation mode.