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Andreik

CUDA dll functions

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Andreik

Does anyone tried with success to compile a dll with a function that use CUDA and then to call the function from AutoIt? Actually the compilation seems to be easy but it might be a little hard to call the function. Here is what I have:

cuda.cu

#include <cuda.h>
#include <cuda_runtime.h>
#include <device_launch_parameters.h>


__global__ void cuda__add(int *a, int *b, int *c)
{
   *c = *a + *b;
}

extern "C" __declspec(dllexport) int Add(int a, int b)
{
  int c;
  int *dev_a,*dev_b,*dev_c;
  int size = sizeof(int);

  cudaMalloc((void**)&dev_a, size);
  cudaMalloc((void**)&dev_b, size);
  cudaMalloc((void**)&dev_c, size);

  cudaMemcpy(dev_a, &a,sizeof(int), cudaMemcpyHostToDevice);  
  cudaMemcpy(dev_b, &b,sizeof(int), cudaMemcpyHostToDevice);  

  cuda__add<<< 1,1 >>>(dev_a,dev_b,dev_c);
  cudaMemcpy(&c, dev_c,size, cudaMemcpyDeviceToHost);

  cudaFree(&dev_a);
  cudaFree(&dev_b);
  cudaFree(&dev_c);

  return c;
}

I am able to open the dll but the function is not visible somehow and I get error 3 when I call it from AutoIt.


When the words fail... music speaks

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RTFC

Hello Andreik,:)

I use CUDA myself, but in a pure C++ environment (need for speed). However, I do have some experience in integrating my own dlls in AutoIt. First off, there's a mismatch between your function declaration and the actual definition (first has 2 parameters, second 3).

My next reaction would be to check capitalisation in the dll call, as these function names are case-sensitive. Furthermore, can you get a non-CUDA dll function to work in the same code?

RT

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Andreik

Hello RTFC,

Thanks for your answer but there's not any mismatch, first one is the function called on device (GPU) and the second one called on the host (CPU). I try to export the function called on the host and the problem isn't the capitalisation because a simple dumpbin.exe /EXPORTS cuda.dll shows me that there's not any exported function.


When the words fail... music speaks

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RTFC

Sorry, my mistake.:> So where do you actually declare your CPU function then? And what does that declaration look like?

AFAIK, to export your dll function(s), <yourdll>.h file should contain the declaration:

extern "C"
{

__declspec(dllexport) int Add(<params>);

}

and <yourdll>.cpp should contain the full definition:

#include <yourdll>.h

extern "C"
{

__declspec(dllexport) int Add(<params>)

{

<code>

}

}

That's just how I do it.

Edited by RTFC
addendum

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jchd

A DLL without export nor externs seems pretty useless.


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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