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PAPI を使用してハードウェア パフォーマンス カウンターを読み取ろうとしており、次のコードを記述しました。

#include <stdio.h>
#include <stdlib.h>
#include "papi.h" /* This needs to be included every time you use PAPI */
#include <unistd.h>

#define NUM_EVENTS 2
#define ERROR_RETURN(retval) { fprintf(stderr, "Error %d %s:line %d: \n", retval,__FILE__,__LINE__);  exit(retval); }

int main(int argc, char *argv[])
{

   if(argc<=1) {
        printf("Pid is not provided, I will die now :( ...");
        exit(1);
     }  //otherwise continue on our merry way....

   int EventSet = PAPI_NULL;
   int tmp, i;
   /*must be initialized to PAPI_NULL before calling PAPI_create_event*/

   long long values[NUM_EVENTS];
   /*This is where we store the values we read from the eventset */

   /* We use number to keep track of the number of events in the EventSet */
   int retval, number;

   char errstring[PAPI_MAX_STR_LEN];
   pid_t pid = atoi(argv[1]);

   unsigned int l2miss = 0x0;
   unsigned int data_all_from_l2 = 0x0;
   /*************************************************************************** 
   *  This part initializes the library and compares the version number of the*
   * header file, to the version of the library, if these don't match then it *
   * is likely that PAPI won't work correctly.If there is an error, retval    *
   * keeps track of the version number.                                       *
   ***************************************************************************/


   if((retval = PAPI_library_init(PAPI_VER_CURRENT)) != PAPI_VER_CURRENT )
      ERROR_RETURN(retval);


   /* Creating the eventset */
   if ( (retval = PAPI_create_eventset(&EventSet)) != PAPI_OK)
      ERROR_RETURN(retval);


   /* Add Native event to the EventSet */
   // if ( (retval = PAPI_event_name_to_code("PM_DATA_FROM_L2MISS",&l2miss)) != PAPI_OK)
    if ( (retval = PAPI_event_name_to_code("PM_L3_CO_MEM",&l2miss)) != PAPI_OK)
      ERROR_RETURN(retval);

    if ( (retval = PAPI_add_event(EventSet, l2miss)) != PAPI_OK)
      ERROR_RETURN(retval);

   /* Add Native event to the EventSet */
    if ( (retval = PAPI_event_name_to_code("PM_DATA_ALL_FROM_L2",&data_all_from_l2)) != PAPI_OK)
      ERROR_RETURN(retval);

    if ( (retval = PAPI_add_event(EventSet, data_all_from_l2)) != PAPI_OK)
      ERROR_RETURN(retval);


   /* get the number of events in the event set */
   number = 0;
   if ( (retval = PAPI_list_events(EventSet, NULL, &number)) != PAPI_OK)
      ERROR_RETURN(retval);

   printf("There are %d events in the event set\n", number);


  retval = PAPI_attach( EventSet, ( unsigned long ) pid );
        if ( retval != PAPI_OK )
        ERROR_RETURN(retval);


   /* Start counting */

   if ( (retval = PAPI_start(EventSet)) != PAPI_OK)
      ERROR_RETURN(retval);

       while(kill(pid,0)==0)
        {
                if ( (retval=PAPI_read(EventSet, values)) != PAPI_OK)
                      ERROR_RETURN(retval);

           printf("The L2 Miss are %lld \n",values[0]);
           printf("The data_all_from_l2 are %lld \n",values[1]);
                sleep(1);
        }//while   

   /* Stop counting and store the values into the array */
   if ( (retval = PAPI_stop(EventSet, values)) != PAPI_OK)
      ERROR_RETURN(retval);

   printf("Total L2 Miss are %lld \n",values[0]);
   printf("Total data_all_from_l2 are %lld \n",values[1]);


   /* free the resources used by PAPI */
   PAPI_shutdown();

   exit(0);
}

次のコマンドを使用してコンパイルします。

gcc -I/apps/PAPI/5.5.0/GCC/5.4.0/CUDA/8.0/include -O0 pid_ex.c  -L/apps/PAPI/5.5.0/GCC/5.4.0/CUDA/8.0/lib -lpapi -o pid_ex

そして、私はそれを次のように実行します:

./pid_ex 7865

ここで、7865 は実行中のプロセスのプロセス ID です。

問題は、カウンター値を表示する代わりにゼロ値を表示していることです。

なぜこのような動作をしているのか、誰か教えてもらえますか? 値が取得されないのはなぜですか?

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