學校課程/平行程式

批改娘 10105. Multiple Device (OpenCL)

contents

  1. 1. 題目描述
  2. 2. 輸入格式
  3. 3. 輸出格式
  4. 4. Sample Input
  5. 5. Sample Output
  6. 6. Solution
    1. 6.1. main.c
    2. 6.2. matrix-lib.cl

題目描述

小明的數學作業要計算方陣，現在請你幫幫他！

題目給定數個 $N \times N$ 的矩陣和 $2$ 小題。

  • $X = AB+CD$
  • $Y = ABE+CDF$

輸入格式

多組測資，每組第一行會有一個整數 $N$，表示題目給定 $N \times N$ 矩陣，第二行上會有 $6$ 個整數，分別為矩陣 $A, B, C, D, E, F$ 的生成種子。

  • $1 \le N \le 1024$
  • $0 \le S_i \le 2^{31}$

輸出格式

輸出兩行 $X$ 和 $Y$ 的雜湊值，可參考 sequence.c 的流程。

Sample Input

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0 1 2 3 4 5
10
0 1 2 3 4 5

Sample Output

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2385860290
1374821695
617438354
1897844131

Solution

這一題要充分實作使用 real-time 分配工作到沒有運行的 GPU 上，利用在 OpenMP 學到的平行技巧，讓多個 thread 等待工作，一抓到工作立即運行。

main.c

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#include <stdio.h>
#include <assert.h>
#include <inttypes.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <CL/cl.h>
#include <omp.h>
#define MAXGPU 3
#define MAXN 1024
uint32_t    hostMtx[MAXGPU][6][MAXN*MAXN];
uint32_t    hostMid[MAXGPU][2][MAXN*MAXN];
char clSrcFormat[32767] = ""; 
char clSrc[32767] = "";
// -- start working with OpenCL
const int clNeedDevCnt = 3;
cl_context	clCtx[MAXGPU];
cl_program	clPrg[MAXGPU];
cl_kernel	clKrnAdd[MAXGPU], clKrnMul[MAXGPU];
cl_command_queue        clQue[MAXGPU];
cl_mem                    clMtx[MAXGPU][6], clMtxTmp[MAXGPU][6];
 
#define CheckFailAndExit(status) \
    if (status != CL_SUCCESS) { \
        fprintf(stderr, "Error %d: Line %u in file %s\n\n", status, __LINE__, __FILE__), \
        destroyGPU(clCtx, clPrg, clKrnAdd, clKrnMul, clQue, clMtx, clMtxTmp); \
    }
#define clFuncArgs cl_context clCtx[], cl_program clPrg[], cl_kernel clKrnAdd[], \
    cl_kernel clKrnMul[], cl_command_queue clQue[], cl_mem clMtx[][6], cl_mem clMtxTmp[][6]
#define clCallFunc clCtx, clPrg, clKrnAdd, clKrnMul, clQue, clMtx, clMtxTmp
#define clCallFuncOuter clCtx, clPrg, clKrnAdd, clKrnMul, clQue, clMtx, clMtxTmp
 
uint32_t writeOut(uint32_t *hostC, int N) {
    uint32_t h = 0;
    uint32_t *Cend = hostC + N*N, *C = hostC;
    for (; C != Cend; C++)
        h = (h + *C) * 2654435761LU;
    return h;
}
void destroyGPU(clFuncArgs) {
    fprintf(stderr, "Starting Cleanup ...\n\n");
    for (int i = 0; i < clNeedDevCnt; i++) {
        for (int j = 0; j < 6; j++) { 
            if (clMtx[i][j])
                clReleaseMemObject(clMtx[i][j]);
            if (clMtxTmp[i][j])
                clReleaseMemObject(clMtxTmp[i][j]);
        }
        if (clKrnAdd[i])    
            clReleaseKernel(clKrnAdd[i]);
        if (clKrnMul[i])
            clReleaseKernel(clKrnMul[i]);
        if (clPrg[i])
            clReleaseProgram(clPrg[i]);
        if (clQue[i])    
            clReleaseCommandQueue(clQue[i]);
        if (clCtx[i])    
            clReleaseContext(clCtx[i]);
    }
    exit(0);
}
int initAllGPU(char fileName[], clFuncArgs) {
    // -- generate kernel code
    FILE *codefin = fopen(fileName, "r");
    assert(codefin != NULL);
    assert(fread(clSrcFormat, 1, 32767, codefin) < 32767);
    sprintf(clSrc, clSrcFormat);
    size_t clSrcLen = strlen(clSrc);
    fclose(codefin);
    cl_int                    clStat;
    cl_uint                    clPlatN, clGPUN, clDevN;
    cl_platform_id            clPlatID;
    cl_device_id            clGPUID[MAXGPU];
    const char                *clSrcPtr = clSrc;
    // -- basic OpenCL setup
    clGetPlatformIDs(1, &clPlatID, &clPlatN);
    clGetDeviceIDs(clPlatID, CL_DEVICE_TYPE_GPU, MAXGPU, clGPUID, &clDevN);
    assert(clDevN >= clNeedDevCnt);
    for (int i = 0; i < clNeedDevCnt; i++) {
        clCtx[i] = clCreateContext(NULL, 1, clGPUID+i, NULL, NULL, &clStat);
        CheckFailAndExit(clStat);
        clQue[i] = clCreateCommandQueue(clCtx[i], clGPUID[i], 0, &clStat);
        CheckFailAndExit(clStat);
        clPrg[i] = clCreateProgramWithSource(clCtx[i], 1, &clSrcPtr, &clSrcLen, &clStat);
        CheckFailAndExit(clStat);
        clStat = clBuildProgram(clPrg[i], 1, clGPUID+i, NULL, NULL, NULL);
        if (clStat != CL_SUCCESS) {
            fprintf(stderr, "Error: Line %u in file %s\n\n", __LINE__, __FILE__);
            size_t log_size;
            clGetProgramBuildInfo(*clPrg, clGPUID[0],
                    CL_PROGRAM_BUILD_LOG, 0, NULL, &log_size);
            char *program_log = (char *) calloc(log_size+1, sizeof(char));
            clGetProgramBuildInfo(*clPrg, clGPUID[0],
                    CL_PROGRAM_BUILD_LOG, log_size+1, program_log, NULL);
            printf("%s", program_log);
            free(program_log);
            CheckFailAndExit(CL_BUILD_PROGRAM_FAILURE);
        }
        clKrnAdd[i] = clCreateKernel(clPrg[i], "matrixAdd", &clStat);
        CheckFailAndExit(clStat);
        clKrnMul[i] = clCreateKernel(clPrg[i], "matrixMul", &clStat);
        CheckFailAndExit(clStat);
        for (int j = 0; j < 6; j++) {
            clMtx[i][j] = clCreateBuffer(clCtx[i], CL_MEM_READ_WRITE, 
                    sizeof(uint32_t)*MAXN*MAXN, NULL, &clStat);
            CheckFailAndExit(clStat);
            clMtxTmp[i][j] = clCreateBuffer(clCtx[i], CL_MEM_READ_WRITE, 
                    sizeof(uint32_t)*MAXN*MAXN, NULL, &clStat);
            CheckFailAndExit(clStat);
        }
    }
    return 1;
}
void matrix_mul(int N, int devIdx, cl_mem *LIN, cl_mem *RIN, cl_mem *OUT, clFuncArgs) {
    cl_int clStat;
    size_t globalOffset[] = {0};
    size_t globalSize[] = {N*N};
    size_t localSize[] = {0};
    for (int i = 1; i <= N; i++) {
        if (N%i == 0 && i*N <= 32768/2)
            localSize[0] = i;
    }
    // -- set argument to kernel
    clStat = clSetKernelArg(clKrnMul[devIdx], 0, sizeof(cl_mem), LIN);
    CheckFailAndExit(clStat);
    clStat = clSetKernelArg(clKrnMul[devIdx], 1, sizeof(cl_mem), RIN);
    CheckFailAndExit(clStat);
    clStat = clSetKernelArg(clKrnMul[devIdx], 2, sizeof(cl_mem), OUT);
    CheckFailAndExit(clStat);
    clStat = clSetKernelArg(clKrnMul[devIdx], 3, sizeof(cl_int), &N);
    CheckFailAndExit(clStat);
    // -- execute
    clStat = clEnqueueNDRangeKernel(clQue[devIdx], clKrnMul[devIdx], 1, globalOffset,
            globalSize, NULL, 0, NULL, NULL);
    CheckFailAndExit(clStat);
}
void matrix_add(int N, int devIdx, cl_mem *LIN, cl_mem *RIN, cl_mem *OUT, clFuncArgs) {
    cl_int clStat;
    size_t globalOffset[] = {0};
    size_t globalSize[] = {N*N};
    // -- set argument to kernel
    clStat = clSetKernelArg(clKrnAdd[devIdx], 0, sizeof(cl_mem), LIN);
    CheckFailAndExit(clStat);
    clStat = clSetKernelArg(clKrnAdd[devIdx], 1, sizeof(cl_mem), RIN);
    CheckFailAndExit(clStat);
    clStat = clSetKernelArg(clKrnAdd[devIdx], 2, sizeof(cl_mem), OUT);
    CheckFailAndExit(clStat);
    // -- execute
    clStat = clEnqueueNDRangeKernel(clQue[devIdx], clKrnAdd[devIdx], 1, globalOffset,
            globalSize, NULL, 0, NULL, NULL);
    CheckFailAndExit(clStat);
}
int solver(int N, int devId, uint32_t ret[], clFuncArgs) {
    uint32_t memSz = N*N*sizeof(uint32_t);
    cl_int clStat;
    for (int i = 0; i < 6; i++) {
        clStat = clEnqueueWriteBuffer(clQue[devId], 
                clMtx[devId][i], 0, 0, memSz,
                hostMtx[devId][i], 0, NULL, NULL);
        CheckFailAndExit(clStat);
    }
    // cuMtxTmp[0] = AB
    matrix_mul(N, devId, &clMtx[devId][0], &clMtx[devId][1], &clMtxTmp[devId][0], clCallFunc);
    // cuMtxTmp[1] = CD
    matrix_mul(N, devId, &clMtx[devId][2], &clMtx[devId][3], &clMtxTmp[devId][1], clCallFunc);
    // cuMtxTmp[2] = ABE
    matrix_mul(N, devId, &clMtxTmp[devId][0], &clMtx[devId][4], &clMtxTmp[devId][2], clCallFunc);
    // cuMtxTmp[3] = CDF
    matrix_mul(N, devId, &clMtxTmp[devId][1], &clMtx[devId][5], &clMtxTmp[devId][3], clCallFunc);
    // cuMtxTmp[4] = AB + CD
    matrix_add(N, devId, &clMtxTmp[devId][0], &clMtxTmp[devId][1], &clMtxTmp[devId][4], clCallFunc);
    // cuMtxTmp[5] = ABE+CDF
    matrix_add(N, devId, &clMtxTmp[devId][2], &clMtxTmp[devId][3], &clMtxTmp[devId][5], clCallFunc);
    clStat = clEnqueueReadBuffer(clQue[devId], clMtxTmp[devId][4], CL_TRUE, 0, 
            sizeof(uint32_t)*N*N, hostMid[devId][0], 0, NULL, NULL);
    CheckFailAndExit(clStat);
    clStat = clEnqueueReadBuffer(clQue[devId], clMtxTmp[devId][5], CL_TRUE, 0, 
            sizeof(uint32_t)*N*N, hostMid[devId][1], 0, NULL, NULL);
    CheckFailAndExit(clStat);
    for (int i = 0; i < 2; i++)
#pragma omp task
    {
        ret[i] = writeOut(hostMid[devId][i], N);
    }
#pragma omp taskwait
    return 1;
}
int readIn(uint32_t S[], int *n, int devId) {
    int N, M;
    if (scanf("%d", &N) != 1)
        return 0;
    M = 6;
    for (int i = 0; i < M; i++)
        assert(scanf("%d", &S[i]) == 1);
    for (int p = 0; p < M; p++)
#pragma omp task
    {
        uint32_t x = 2, n = N*N, c = S[p];
        x = 2;
        for (int i = 0; i < N; i++) {
            for (int j = 0; j < N; j++) {
                x = (x * x + c + i + j)%n;
                hostMtx[devId][p][i*N+j] = x;
            }
        }
    }
#pragma omp taskwait
    *n = N;
    return 1;
}
void onStart(clFuncArgs) {
    initAllGPU("matrix-lib.cl", clCallFunc);
    int inN = 0;
    static uint32_t ansQue[32767][2];
#pragma omp parallel sections
    {
#pragma omp section
        {
            while (1) {
                int f = 0, N, pid = 0;
                uint32_t S[32];
#pragma omp critical
                {
                    f = readIn(S, &N, 0);
                    pid = inN;
                    inN += f;
                }
                if (f == 0)
                    break;
                solver(N, 0, ansQue[pid], clCallFunc);
            }
        }
#pragma omp section
        {
            while (1) {
                int f = 0, N, pid = 0;
                uint32_t S[32];
#pragma omp critical
                {
                    f = readIn(S, &N, 1);
                    pid = inN;
                    inN += f;
                }
                if (f == 0)
                    break;
                solver(N, 1, ansQue[pid], clCallFunc);
            }
        }
#pragma omp section
        {
            while (1) {
                int f = 0, N, pid = 0;
                uint32_t S[32];
#pragma omp critical
                {
                    f = readIn(S, &N, 2);
                    pid = inN;
                    inN += f;
                }
                if (f == 0)
                    break;
                solver(N, 2, ansQue[pid], clCallFunc);
            }
        }
    }
    for (int i = 0; i < inN; i++)
        printf("%u\n%u\n", ansQue[i][0], ansQue[i][1]);	
    destroyGPU(clCallFunc);
}
void sigHandler(int signo) {
    printf("God Bless Me\n");
    destroyGPU(clCallFuncOuter);
    exit(0);
}
int main(int argc, char *argv[]) {
    const char sigErr[] = "I can't catch signal.\n";
    if (signal(SIGTRAP, sigHandler) == SIG_ERR)
        fprintf(stderr, sigErr);
    if (signal(SIGSEGV, sigHandler) == SIG_ERR)
        fprintf(stderr, sigErr);
    if (signal(SIGILL, sigHandler) == SIG_ERR)
        fprintf(stderr, sigErr);
    if (signal(SIGFPE, sigHandler) == SIG_ERR)
        fprintf(stderr, sigErr);
    if (signal(SIGINT, sigHandler) == SIG_ERR)     
        fprintf(stderr, sigErr);
    onStart(clCallFuncOuter);
    return 0;
}

matrix-lib.cl

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#define CTYPE unsigned int
__kernel void matrixAdd(__global CTYPE *in1,
        __global CTYPE *in2,
        __global CTYPE *out) {
    int x = get_global_id(0);
    out[x] = in1[x] + in2[x];
}
__kernel void matrixMul(__global CTYPE *in1,
        __global CTYPE *in2,
        __global CTYPE *out, int N) {
    int id = get_global_id(0);
    int x = id / N, y = id % N;
    CTYPE sum = 0;
    for (int i = 0; i < N; i++)
        sum += in1[x*N + i] * in2[i*N + y];
    out[x * N + y] = sum;
}