I am using ATI RV770 graphics card, OpenCl 1.0 and ati-stream-sdk-v2.3-lnx64 on linux.
While running my host code which includes following two sections to build kernel program, i am getting error code (-11) i.e. cl_build_program_failure
. Does it means that kernel program compiled, if not then how is it compiled and debugged?
const char* KernelPath = "abc_kernel.cl"; //kernel program is in separate file but in same directory of host code..
/* Create Program object from the kernel source *******/
char* sProgramSource = readKernelSource(KernelPath);
size_t sourceSize = strlen(sProgramSource) ;
program = clCreateProgramWithSource(context, 1,(const char **) &sProgramSource,&sourceSize, &err);
checkStatus("error while creating program",err);
/* Build (compile & Link ) Program *******/
char* options = (char* )malloc(10*sizeof(char));
strcpy(options, "-g");
err = clBuildProgram(program, num_devices, devices_id, options, NULL, NULL);
checkStatus("Build Program Failed", err); //This line throwing the error....
function to read kernel program is as follows::
/* read program source file*/
char* readKernelSource(const char* kernelSourcePath){
FILE *fp = NULL;
size_t sourceLength;
char *sourceString ;
fp = fopen( kernelSourcePath , "r");
if(fp == 0)
{
printf("failed to open file");
return NULL;
}
// get the length of the source code
fseek(fp, 0, SEEK_END);
sourceLength = ftell(fp);
rewind(fp);
// allocate a buffer for the source code string and read it in
sourceString = (char *)malloc( sourceLength + 1);
if( fread( sourceString, 1, sourceLength, fp) !=sourceLength )
{
printf("\n\t Error : Fail to read file ");
return 0;
}
sourceString[sourceLength+1]='\0';
fclose(fp);
return sourceString;
}// end of readKernelSource
Can anyone tell how to fix it?
Does it means that it is OpenCl compilation error at runtime or something else?
//Printing build_log info using clGetProgramBuildInfo() as below, But why is is not printing anything?
char* build_log; size_t log_size;
// First call to know the proper size
err = clGetProgramBuildInfo(program, devices_id, CL_PROGRAM_BUILD_LOG, 0, NULL, &log_size);
build_log = (char* )malloc((log_size+1));
// Second call to get the log
err = clGetProgramBuildInfo(program, devices_id, CL_PROGRAM_BUILD_LOG, log_size, build_log, NULL);
build_log[log_size] = '\0';
printf("--- Build log ---\n ");
fprintf(stderr, "%s\n", build_log);
free(build_log);
This error is typically caused by a syntax error in your kernel code. You can call the OpenCL function clGetProgramBuildInfo with the flag CL_PROGRAM_BUILD_LOG to access the log generated by the compiler. This log contains the output you are probably used to when compiling on the command-line (errors, warnings, etc.).
For example, you could add something similar to the following after you call clBuildProgram:
if (err == CL_BUILD_PROGRAM_FAILURE) {
// Determine the size of the log
size_t log_size;
clGetProgramBuildInfo(program, devices_id[0], CL_PROGRAM_BUILD_LOG, 0, NULL, &log_size);
// Allocate memory for the log
char *log = (char *) malloc(log_size);
// Get the log
clGetProgramBuildInfo(program, devices_id[0], CL_PROGRAM_BUILD_LOG, log_size, log, NULL);
// Print the log
printf("%s\n", log);
}
You can also see the function buildOpenCLProgram() in SDKCommon.cpp in the AMD APP SDK for a real example.