简言之,《守则》确实创造了两个2^23长的气管病媒,一个在东道方,另一个在装置上,彼此相同,并且加以分类。 它还(试图)衡量每个目标的时间。

关于东道病媒一的使用<代码>std:sort。 关于装置矢量I的使用thrust:sort。

所使用的汇编一

iii - 侵权行为

终端方案的产出是:

桌面:

所用时间为:19 224622882秒

所用装置时间为:19,321644143秒

桌面:

The first std::cout statement is produced after 19.224 seconds as stated. Yet the second std::cout statement (even though it says 19.32 seconds) is produced immediately after the first std::cout statement. Note that I have used different time_stamps for measurements in clock_gettime() viz ts_host and ts_device

I am using Cuda 4.0 and NVIDIA GTX 570 compute capability 2.0

  #include<iostream>
    #include<vector>
    #include<algorithm>
    #include<stdlib.h>

    //For timings
    #include<time.h>
    //Necessary thrust headers
    #include<thrust/sort.h>
    #include<thrust/host_vector.h>
    #include<thrust/device_vector.h>
    #include<thrust/copy.h>


    int main(int argc, char *argv[])
    {
      int N=23;
      thrust::host_vector<int>H(1<<N);//create a vector of 2^N elements on host
      thrust::device_vector<int>D(1<<N);//The same on the device.
      thrust::host_vector<int>dummy(1<<N);//Copy the D to dummy from GPU after sorting 

       //Set the host_vector elements. 
      for (int i = 0; i < H.size(); ++i)    {
          H[i]=rand();//Set the host vector element to pseudo-random number.
        }

      //Sort the host_vector. Measure time
      // Reset the clock
        timespec ts_host;
        ts_host.tv_sec = 0;
        ts_host.tv_nsec = 0;
        clock_settime(CLOCK_PROCESS_CPUTIME_ID, &ts_host);//Start clock

             thrust::sort(H.begin(),H.end());

        clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts_host);//Stop clock
        std::cout << "
Host Time taken is: " << ts_host.tv_sec<<" . "<< ts_host.tv_nsec <<" seconds" << std::endl;


        D=H; //Set the device vector elements equal to the host_vector
      //Sort the device vector. Measure time.
        timespec ts_device;
        ts_device.tv_sec = 0;
            ts_device.tv_nsec = 0;
        clock_settime(CLOCK_PROCESS_CPUTIME_ID, &ts_device);//Start clock

             thrust::sort(D.begin(),D.end());
             thrust::copy(D.begin(),D.end(),dummy.begin());


        clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts_device);//Stop clock
        std::cout << "
Device Time taken is: " << ts_device.tv_sec<<" . "<< ts_device.tv_nsec <<" seconds" << std::endl;

      return 0;
    }