I am very new to CUDA programming.. I wrote my first code and when I compiled it, it is showing me a lots of error. Can anyone tell me what is wrong
the code
#include <stdio.h>
#include "cuda.h"
#include <stdlib.h>
__global__ void kernel(void) {
}
int main(int argc, char *argv[])
{
kernel<<<1,1>>>();
printf("finished \n");
return 0;
}
The errors are
cuda.c:5: error: expected â=â, â,â, â;â, âasmâ or â__attribute__â before âvoidâ
cuda.c:7: error: expected â=â, â,â, â;â, âasmâ or â__attribute__â before âvoidâ
cuda.c: In function âmainâ:
cuda.c:12: error: âkernelâ undeclared (first use in this function)
cuda.c:12: error: (Each undeclared identifier is reported only once
cuda.c:12: error: for each function it appears in.)
cuda.c:12: error: expected expression before â<â token
I compiled using
nvcc cuda.c
Can anyone tell me what mistake I am making....
nvcc runs .c files through the normal C compiler. Rename your file to cuda.cu.
Related
I have 2 files that form a small CUDA library from my previous program (which works well, btw) written on C++.
The header for this library is:
#ifndef __cudaLU__
#define __cudaLU__
#include <assert.h>
#include <cuda_runtime.h>
#include <cusolverDn.h>
#include <cusolverSp.h>
#include <cusparse.h>
#include <cuComplex.h>
#include <stdlib.h>
void denseLS(int dim,
std::complex<float> * A,
std::complex<float> * b );
void sparseLS(int dim,
std::complex<float> *csrVal,
int *csrRowPtr,
int *csrColInd,
std::complex<float> *vecVal);
#endif
And I want to use this library in my old-as-the-hills C program just by setting procedure in the head of my main.c file:
extern void denseLS(int dim, float complex *A, float complex *b);
And it fails with a bunch of similar errors. Few of them are:
..NA/cudaLS.cu(115): error: namespace "std" has no member "complex"
..NA/cudaLS.cu(115): error: expected a ")"
..NA/cudaLS.cu(137): error: identifier "csrRowPtr" is undefined
..NA/cudaLS.cu(169): error: identifier "csrColInd" is undefined
..NA/cudaLS.cu(170): error: identifier "csrVal" is undefined
..NA/cudaLS.cu(171): error: identifier "vecVal" is undefined
I tried to make a change std::complex -> float complex and nothing works. Still same errors (without std error, ofc).
The cmake instructions file
cmake_minimum_required(VERSION 3.8)
project(NA)
set(CMAKE_C_STANDARD 11)
find_package(GSL REQUIRED)
find_package(CUDA REQUIRED)
include_directories("${CUDA_INCLUDE_DIRS}")
cuda_add_library(solvers STATIC
cudaLS.cu
cudaLS.h)
target_link_libraries(solvers ${CUDA_LIBRARIES} ${CUDA_cusparse_LIBRARY} ${CUDA_cusolver_LIBRARY})
target_compile_features(solvers PUBLIC cxx_std_11)
set_target_properties( solvers
PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
add_executable(NA main.c)
set_target_properties(NA PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
target_link_libraries(NA PRIVATE GSL::gsl m solvers)
What am I doing wrong pals?
UPD:
g++/gcc - 7.3
Linux
Well, I found what exactly I did in a wrong way.
Cmake is OK. But headers in the .h file have to be modified to
extern "C" void denseLS(int dim, cuComplex *A, cuComplex *b );
The cuda functions in .c have to be decleared in the head (or separate .h-file) as
void denseLS(int dim, float complex *A, float complex *b);
I want compile to mips
My test code is here.
#include <stdio.h>
int main(int argc, char **argv)
{
char a;
a = 10;
__sync_lock_test_and_set(&a, 1);
__sync_lock_release(&a);
return 0;
}
compile error message here
/tmp/ccs0M6bI.o: In function `main':
test.c:(.text+0x40): undefined reference to `__sync_lock_test_and_set_1'
collect2: ld returned 1 exit status
My mips gcc compiler version is 4.3
(This problem is compiler version 4.7 is ok, but i'm can't use other version )
How can i solve this issue ?
I am trying to run the cuSolver library available in cuda 7.0. I have an issue with using the cuSolver library that must be very simple to fix, but here I am asking for some help.
I have looked at quite a few examples posted around and I chose in particular this one from JackOLantern:
Parallel implementation for multiple SVDs using CUDA
I have just reduced it to a kernel_0.cu:
#include "cuda_runtime.h"
#include "device_launch_parameters.h"
#include<iostream>
#include<iomanip>
#include<stdlib.h>
#include<stdio.h>
#include<assert.h>
#include<math.h>
#include <cusolverDn.h>
#include <cuda_runtime_api.h>
#include "Utilities.cuh"
/********/
/* MAIN */
/********/
int main(){
// --- gesvd only supports Nrows >= Ncols
// --- column major memory ordering
// --- cuSOLVE input/output parameters/arrays
int *devInfo; gpuErrchk(cudaMalloc(&devInfo, sizeof(int)));
// --- CUDA solver initialization
cusolverDnHandle_t solver_handle;
cusolverDnCreate(&solver_handle);
cusolverDnDestroy(solver_handle);
return 0;
}
I use the same Utilities.cuh and Utilities.cu as JackOlantern. I compile it as (to be explicit):
/usr/local/cuda-7.0/bin/nvcc kernel_0.cu Utilities.cu
And what I get is:
Utilities.cu(27): warning: conversion from a string literal to "char *" is deprecated
Utilities.cu(27): warning: conversion from a string literal to "char *" is deprecated
/tmp/tmpxft_00007e1d_00000000-22_kernel_0.o: In function `main':
tmpxft_00007e1d_00000000-4_kernel_0.cudafe1.cpp:(.text+0x3d): undefined reference to `cusolverDnCreate'
tmpxft_00007e1d_00000000-4_kernel_0.cudafe1.cpp:(.text+0x49): undefined reference to `cusolverDnDestroy'
collect2: error: ld returned 1 exit status
If I comment out the cusolverDnCreate and cusolverDnDestroy, it compiles fine, so the library is apparently well included.
What simple and basic point am I missing? I have searched around, but I could not fix it. Thanks there.
What simple and basic point am I missing?
You have to link against the cusolver library:
/usr/local/cuda-7.0/bin/nvcc kernel_0.cu Utilities.cu -lcusolver
I am trying to integrate CUDA code with my existing C++ application. As instructed on some web side, I need to have a "file.cu" where in I have a wrapper function which does the memory allocation on the GPU and launch kernel. I followed that advise but, I am not able to compile the code now.
file.cu
#include <cuda.h>
#include <stdio.h>
void preComputeCorrelation_gpu( int * d )
{
//I shall write the kernel later once I am confirmed that CUDA code works
cudaDeviceProp prop;
cudaGetDeviceProperties( &prop, 0 );
printf( "name = %s\n", prop.name );
}
main.cpp
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <cuda.h>
#define __CUDA_SUPPORT__
#ifdef __CUDA_SUPPORT__
// Defination to be found in "cudaWrap.cu"
extern void preComputeCorrelation_gpu( int * d );
#endif
int main()
{
//code to read d from the file and other initialization
int * d;
.
.
#ifdef __CUDA_SUPPORT__
fprintf( stderr, "GPU Computation starts" );
// Defination to be found in "cudaWrap.cu"
preComputeCorrelation_gpu( d );
#else
fprintf( stderr, "CPU Computation starts" );
preComputeCorrelation( d );
#endif
.
.
//more code
return 0 ;
}
Now, I put following commands to compile the code
$ nvcc -c cudaWrap.cu <br/>
$ g++ -I /usr/local/cuda-5.0/include -L /usr/local/cuda-5.0/lib -o GA_omp GA_dev_omp.cpp main_omp.cpp data_stats.cpp cudaWrap.o
Compilation fails and I get the following message after the 2nd command. Although the 1st command works.
cudaWrap.o: In function `preComputeCorrelation_gpu(DataSet*)':
tmpxft_00001061_00000000-3_cudaWrap.cudafe1.cpp:(.text+0x2f): undefined reference to `cudaGetDeviceProperties'
cudaWrap.o: In function `__cudaUnregisterBinaryUtil()':
tmpxft_00001061_00000000-3_cudaWrap.cudafe1.cpp:(.text+0x6b): undefined reference to `__cudaUnregisterFatBinary'
cudaWrap.o: In function `__sti____cudaRegisterAll_43_tmpxft_00001061_00000000_6_cudaWrap_cpp1_ii_f8a043c5()':
tmpxft_00001061_00000000-3_cudaWrap.cudafe1.cpp:(.text+0x8c): undefined reference to `__cudaRegisterFatBinary'
collect2: ld returned 1 exit status
How to I sort this out really?
The solution to this problem is that linking of the ordinary c++ code and cuda code needs to be done with libcudart.so
Compilation should look some like --
$ nvcc -c cudaWrap.cu
$ g++ -lcudart -I /usr/local/cuda-5.0/include -L /usr/local/cuda-5.0/lib -o GA_omp GA_dev_omp.cpp main_omp.cpp data_stats.cpp cudaWrap.o
In this case, cudaWrap.cu contains the cuda code. main_omp.cpp contains the main() and there are some other application files that need compiling too.
I'm trying to compile the following piece of code:
#include <stdio.h>
#include <time.h>
#include <cuda.h>
#include <cuda_runtime_api.h>
texture<float, 2, cudaReadModeElementType> tex;
int main () { ... }
yet, nvcc gives me the following error:
main.c:6:8: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘<’ token
I'm pretty new to CUDA, so I suppose I'm missing something here.
You can only use CUDA syntax in .cu files.