perftest.c

//
// File:       hello.c
//
// Abstract:   A simple "Hello World" compute example showing basic usage of OpenCL which
//             calculates the mathematical square (X[i] = pow(X[i],2)) for a buffer of
//             floating point values.
//
//
// Version:    <1.0>
//
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// Copyright ( C ) 2008 Apple Inc. All Rights Reserved.
//

////////////////////////////////////////////////////////////////////////////////

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <CL/opencl.h>

////////////////////////////////////////////////////////////////////////////////

// Use a static data size for simplicity
//
#define DATA_SIZE (1048576)

////////////////////////////////////////////////////////////////////////////////

// Simple compute kernel which computes the square of an input array
//
const char *KernelSource = "\n" \
"__kernel void square(                                                  \n" \
"   __global float* input,                                              \n" \
"   __global float* output,                                             \n" \
"   const unsigned int count)                                           \n" \
"{                                                                      \n" \
"   int i = get_global_id(0);                                           \n" \
"   //if(i < count)                                                     \n" \
"   output[i] = input[i] * input[i];                                    \n" \
"}                                                                      \n" \
"\n";

////////////////////////////////////////////////////////////////////////////////

int main( int argc, char *argv[] )
{
    int err;                            // error code returned from api calls

    float *data;                        // original data set given to device
    float *results;                     // results returned from device
    size_t count;
    unsigned int correct;               // number of correct results returned

    size_t global;                      // global domain size for our calculation
    size_t local;                       // local domain size for our calculation
    size_t k;
    size_t i;
    cl_device_id device_id;             // compute device id
    cl_context context;                 // compute context
    cl_command_queue commands;          // compute command queue
    cl_program program;                 // compute program
    cl_kernel kernel;                   // compute kernel

    cl_mem input;                       // device memory used for the input array
    cl_mem output;                      // device memory used for the output array

    cl_platform_id platforms[32];           //an array to hold the IDs of all the platforms, hopefuly there won't be more than 32
    cl_uint num_platforms;              //this number will hold the number of platforms on this machine
    char vendor[1024];              //this strirng will hold a platforms vendor

    cl_device_id devices[32];           //this variable holds the number of devices for each platform, hopefully it won't be more than 32 per platform
    cl_uint num_devices;                //this number will hold the number of devices on this machine
    char deviceName[1024];              //this string will hold the devices name
    cl_uint numberOfCores;              //this variable holds the number of cores of on a device
    cl_long amountOfMemory;             //this variable holds the amount of memory on a device
    cl_uint clockFreq;              //this variable holds the clock frequency of a device
    cl_ulong maxAlocatableMem;          //this variable holds the maximum allocatable memory
    cl_ulong localMem;              //this variable holds local memory for a device
    cl_bool available;              //this variable holds if the device is available
    int pid;                        //Platform id
    // Init data arrays and count
    data = malloc(sizeof(float)*DATA_SIZE);              // original data set given to device
    results = malloc(sizeof(float)*DATA_SIZE);           // results returned from device
    count = DATA_SIZE;
    // Fill our data set with random float values
    //
    for(i = 0; i < DATA_SIZE; i++)
        data[i] = rand() / (float)RAND_MAX;
    // Connect to a compute device
    //
    clGetPlatformIDs(3, platforms, &num_platforms);
    if (argc<2){
        printf("Platform id is required. Choose from 0-2");
        return 1;
    }
    if (sscanf (argv[1], "%i", &pid)!=1) {
        printf ("error - not an integer");
        return 1;
    }
    err = clGetDeviceIDs(platforms[pid], CL_DEVICE_TYPE_ALL, 1, &device_id, NULL);
    if (err != CL_SUCCESS)
    {
        printf("Error: Failed to create a device group!\n");
        return EXIT_FAILURE;
    } else {
        printf("Succeeded to create a device group!\n");
    }

    //scan in device information
    clGetDeviceInfo(device_id, CL_DEVICE_NAME, sizeof(deviceName), deviceName, NULL);
    clGetDeviceInfo(device_id, CL_DEVICE_VENDOR, sizeof(vendor), vendor, NULL);
    clGetDeviceInfo(device_id, CL_DEVICE_MAX_COMPUTE_UNITS, sizeof(numberOfCores), &numberOfCores, NULL);
    clGetDeviceInfo(device_id, CL_DEVICE_GLOBAL_MEM_SIZE, sizeof(amountOfMemory), &amountOfMemory, NULL);
    clGetDeviceInfo(device_id, CL_DEVICE_MAX_CLOCK_FREQUENCY, sizeof(clockFreq), &clockFreq, NULL);
    clGetDeviceInfo(device_id, CL_DEVICE_MAX_MEM_ALLOC_SIZE, sizeof(maxAlocatableMem), &maxAlocatableMem, NULL);
    clGetDeviceInfo(device_id, CL_DEVICE_LOCAL_MEM_SIZE, sizeof(localMem), &localMem, NULL);
    clGetDeviceInfo(device_id, CL_DEVICE_AVAILABLE, sizeof(available), &available, NULL);


    //print out device information
    printf("\tDevice: %u\n", pid);
    printf("\t\tName:\t\t\t\t%s\n", deviceName);
    printf("\t\tVendor:\t\t\t\t%s\n", vendor);
    printf("\t\tAvailable:\t\t\t%s\n", available ? "Yes" : "No");
    printf("\t\tCompute Units:\t\t\t%u\n", numberOfCores);
    printf("\t\tClock Frequency:\t\t%u mHz\n", clockFreq);
    printf("\t\tGlobal Memory:\t\t\t%0.00f mb\n", (double)amountOfMemory/1048576);
    printf("\t\tMax Allocateable Memory:\t%0.00f mb\n", (double)maxAlocatableMem/1048576);
    printf("\t\tLocal Memory:\t\t\t%u kb\n\n", (unsigned int)localMem);
    // Create a compute context
    //
    context = clCreateContext(0, 1, &device_id, NULL, NULL, &err);
    if (!context)
    {
        printf("Error: Failed to create a compute context!\n");
        return EXIT_FAILURE;
    } else {
        printf("Succeeded to create a compute context!\n");
    }

    // Create a command commands
    //
    commands = clCreateCommandQueue(context, device_id, 0, &err);
    if (!commands)
    {
        printf("Error: Failed to create a command commands!\n");
        return EXIT_FAILURE;
    } else {
        printf("Succeeded to create a command commands!\n");
    }

    // Create the compute program from the source buffer
    //
    program = clCreateProgramWithSource(context, 1, (const char **) & KernelSource, NULL, &err);
    if (!program)
    {
        printf("Error: Failed to create compute program!\n");
        return EXIT_FAILURE;
    } else {
        printf("Succeeded to create compute program!\n");
    }

    // Build the program executable
    //
    err = clBuildProgram(program, 0, NULL, NULL, NULL, NULL);
    if (err != CL_SUCCESS)
    {
        size_t len;
        char buffer[2048];

        printf("Error: Failed to build program executable!\n");
        clGetProgramBuildInfo(program, device_id, CL_PROGRAM_BUILD_LOG, sizeof(buffer), buffer, &len);
        printf("%s\n", buffer);
        exit(1);
    } else {
        printf("Succeeded to create program executable!\n");
    }

    // Create the compute kernel in the program we wish to run
    //
    kernel = clCreateKernel(program, "square", &err);
    if (!kernel || err != CL_SUCCESS)
    {
        printf("Error: Failed to create compute kernel!\n");
        exit(1);
    } else {
        printf("Succeeded to create compute kernel!\n");
    }
    for(k = 0; k<9999; k++){
        // Create the input and output arrays in device memory for our calculation
        //
        input = clCreateBuffer(context,  CL_MEM_READ_ONLY,  sizeof(float) * DATA_SIZE, NULL, NULL);
        output = clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(float) * DATA_SIZE, NULL, NULL);
        if (!input || !output)
        {
            printf("Error: Failed to allocate device memory!\n");
            exit(1);
        }

        // Write our data set into the input array in device memory
        //
        err = clEnqueueWriteBuffer(commands, input, CL_TRUE, 0, sizeof(float) * DATA_SIZE, data, 0, NULL, NULL);
        if (err != CL_SUCCESS)
        {
            printf("Error: Failed to write to source array!\n");
            exit(1);
        }

        // Set the arguments to our compute kernel
        //
        err = 0;
        err  = clSetKernelArg(kernel, 0, sizeof(cl_mem), &input);
        err |= clSetKernelArg(kernel, 1, sizeof(cl_mem), &output);
        err |= clSetKernelArg(kernel, 2, sizeof(unsigned int), &count);
        if (err != CL_SUCCESS)
        {
            printf("Error: Failed to set kernel arguments! %d\n", err);
            exit(1);
        }

        // Get the maximum work group size for executing the kernel on the device
        //
        err = clGetKernelWorkGroupInfo(kernel, device_id, CL_KERNEL_WORK_GROUP_SIZE, sizeof(local), &local, NULL);
        if (err != CL_SUCCESS)
        {
            printf("Error: Failed to retrieve kernel work group info! %d\n", err);
            exit(1);
        }

        // Execute the kernel over the entire range of our 1d input data set
        // using the maximum number of work group items for this device
        //
        global = count;
        err = clEnqueueNDRangeKernel(commands, kernel, 1, NULL, &count, NULL, 0, NULL, NULL);
        if (err)
        {
            printf("Error: Failed to execute kernel!\n");
            return EXIT_FAILURE;
        }

        // Wait for the command commands to get serviced before reading back results
        //
        clFinish(commands);

        // Read back the results from the device to verify the output
        //
        err = clEnqueueReadBuffer( commands, output, CL_TRUE, 0, sizeof(float) * DATA_SIZE, results, 0, NULL, NULL );
        if (err != CL_SUCCESS)
        {
            printf("Error: Failed to read output array! %d\n", err);
            exit(1);
        }

        // Validate our results
        //
        correct = 0;
        for(i = 0; i < DATA_SIZE; i++)
        {
            if(results[i] == data[i] * data[i])
                correct++;
        }

        // Print a brief summary detailing the results
        //
        //printf("Computed '%d/%d' correct values!\n", correct, count);

        // Shutdown and cleanup
        //
        clReleaseMemObject(input);
        clReleaseMemObject(output);
    }
    clReleaseProgram(program);
    clReleaseKernel(kernel);
    clReleaseCommandQueue(commands);
    clReleaseContext(context);

    return 0;
}