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*/
// Test hipEventRecord serialization behavior.
// Through manual inspection of the reported timestamps, can determine if recording a NULL event
// forces synchronization : set

/* HIT_START
 * BUILD: %t %s ../../test_common.cpp
 * TEST: %t --iterations 10
 * HIT_END
 */

#include "hip/hip_runtime.h"
#include "test_common.h"

int main(int argc, char* argv[]) {
    HipTest::parseStandardArguments(argc, argv, true);

    unsigned blocks = (N + threadsPerBlock - 1) / threadsPerBlock;
    if (blocks > 1024) blocks = 1024;
    if (blocks == 0) blocks = 1;

    printf("N=%zu (A+B+C= %6.1f MB total) blocks=%u threadsPerBlock=%u iterations=%d\n", N,
           ((double)3 * N * sizeof(float)) / 1024 / 1024, blocks, threadsPerBlock, iterations);
    printf("iterations=%d\n", iterations);

    size_t Nbytes = N * sizeof(float);

    float *A_h, *B_h, *C_h;
    float *A_d, *B_d, *C_d;
    HipTest::initArrays(&A_d, &B_d, &C_d, &A_h, &B_h, &C_h, N);

    hipEvent_t start, stop;

    // NULL stream check:
    HIPCHECK(hipEventCreate(&start));
    HIPCHECK(hipEventCreate(&stop));


    HIPCHECK(hipMemcpy(A_d, A_h, Nbytes, hipMemcpyHostToDevice));
    HIPCHECK(hipMemcpy(B_d, B_h, Nbytes, hipMemcpyHostToDevice));


    for (int i = 0; i < iterations; i++) {
        //--- START TIMED REGION
        long long hostStart = HipTest::get_time();
        // Record the start event
        HIPCHECK(hipEventRecord(start, NULL));

        hipLaunchKernelGGL(HipTest::vectorADD, dim3(blocks), dim3(threadsPerBlock), 0, 0,
                        static_cast<const float*>(A_d), static_cast<const float*>(B_d), C_d, N);


        HIPCHECK(hipEventRecord(stop, NULL));
        HIPCHECK(hipEventSynchronize(stop));
        long long hostStop = HipTest::get_time();
        //--- STOP TIMED REGION


        float eventMs = 1.0f;
        HIPCHECK(hipEventElapsedTime(&eventMs, start, stop));
        float hostMs = HipTest::elapsed_time(hostStart, hostStop);

        printf("host_time (gettimeofday)          =%6.3fms\n", hostMs);
        printf("kernel_time (hipEventElapsedTime) =%6.3fms\n", eventMs);
        printf("\n");

        // Make sure timer is timing something...
        HIPASSERT(eventMs > 0.0f);
    }


    HIPCHECK(hipMemcpy(C_h, C_d, Nbytes, hipMemcpyDeviceToHost));

    HIPCHECK(hipEventDestroy(start));
    HIPCHECK(hipEventDestroy(stop));

    printf("check:\n");

    HipTest::checkVectorADD(A_h, B_h, C_h, N, true);


    passed();
}
