PAPI 的使用。

2497阅读　0评论2012-02-10　finger_lake
分类：LINUX

                                                                                                                
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  1. //#include "papi.h"
  2. #include "/home/zxx/papi-4.2.0/src/papi.h"
  3. #include <stdlib.h>
  4. #include <stdio.h>

  6. int main() {

  8.     int EventSet;
  9.         int i, sum;
  10.     long_long values[1], values1[1], values2[1];

  12.     /* Initialize the PAPI library */
  13.     if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
  14.                 exit(-1);
  15.       // exit(-1);

  17.     /* Create an EventSet */
  18.     EventSet = PAPI_NULL;
  19.     if (PAPI_create_eventset(&EventSet) != PAPI_OK)
  20.         exit(-1);

  22.     /* Add an event about Total Instructions Executed (PAPI_TOT_INS) to EventSet */
  23.     if (PAPI_add_event(EventSet, PAPI_TOT_INS) != PAPI_OK)
  24.         exit(-1);

  26.     /* Start counting events */
  27.     if (PAPI_start(EventSet) != PAPI_OK)
  28.         exit(-1);

  30.     /* Read counters before workload running*/
  31.     if (PAPI_read(EventSet, values1) != PAPI_OK)
  32.         exit(-1);

  34.     /* Do some computation here */
  35.         for (i=0;i<10000;i++)
  36.                 sum+=i;

  38.     /* Stop counting events */
  39.     /* Stop counting events */
  40.     if (PAPI_stop(EventSet, values2) != PAPI_OK)
  41.         exit(-1);


  44.     /* Clean up EventSet */
  45.     if (PAPI_cleanup_eventset(EventSet) != PAPI_OK)
  46.         exit(-1);

  48.     /* Destroy the EventSet */
  49.     if (PAPI_destroy_eventset(&EventSet) != PAPI_OK)
  50.         exit(-1);

  52.     /* Shutdown PAPI */
  53.     PAPI_shutdown();
  54.     /* Get value */
  55.  // values[0] = values2[0] – values1[0];
  56.         values[0]=values2[0]-values1[0];
  57.         printf("%d\n",values[0]);
  58.         return 0;
  59. }
  60. ~

                                                                                                                           
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