Lv5

#include <omp.h>
#include <stdio.h>
#include <stdlib.h>
int main (int argc, char *argv[]) { 		//argc-broj parametara koji predajemo program(kada predajemo, gdje)
//argv-pokazivac na memorijske adrese koje sadrzavaju nazive parametara(kojih parametara, gdje se koristi)

  double *row = (double *)malloc(2000*2000*sizeof(double));
  double *rez = (double *)malloc(2000*2000*sizeof(double));
  double *matrix = (double *)malloc(2000*2000*sizeof(double));
//takva je sintaksa?

  int i,j,k;
  int count = 0;
  double sum;


  for (i=0;i<2000;i++)
  {

      for (j=0;j<2000;j++)
      {
          *(row+i*2000+j)= ++count;
          *(matrix+i*2000+j)= ++count;		//popunjavanje matrica valjda random double brojevima?
      }
  }

  double start;		//wtf?
  omp_set_num_threads(8);		//kako znam da je 8 najoptimalnije, jer on najkrace traje?
  start = omp_get_wtime();			//dohvacanje podataka za real cpu time?
#pragma omp parallel for private(j,k)		//jel taj # slucajno ili njega treba makuti ?

  for (i=0;i<2000;i++)
  {
      for (j=0;j<2000;j++)
      {
          for(k=0;k<2000;k++){
sum=sum + ((row+i*2000+j))(*(matrix+i*2000+j));		//zasto ima pokazivac prije matrix a nema prije row, I sta znaci row+I a sta je *2000+j)
          }
          *(rez+i*2000+j)= sum;		//jel to zapis suma u matricu rez?
          sum = 0;			//zasto je sum=0 ako smo ga sada izracunali
      }
  }

  for (i=0;i<2000;i++)
  {
      printf("%d", rez[i]);		//jel to ispis reza?
  }

  double end;		//zasto mi treba taj double start I double end, da je short jel bi isto trebalo?

  end = omp_get_wtime();
  printf("\n Timer: %f \n", end-start);		//kao ispis real cpu time-a


 return 0;
}

Lv4

#include <omp.h>
#include <stdio.h>
#include <stdlib.h>
int main (int argc, char *argv[]) {

  int row[100];
  int rez[100];
  int matrix[100][100];
  int i,j;

  for (i=0;i<100;i++)
  {
	  row[i]=11;		//zasto 11?
	  rez[i]=0;
	  for (j=0;j<100;j++)
	  {
		  matrix[i][j]=22;		//zasto 22?
	  }
  }

  double start;
  start = omp_get_wtime();

  for (i=0;i<100;i++)
  {
	  for (j=0;j<100;j++)
	  {
rez[i]=(row[j]*matrix[i][j]) + rez[i];	//jesu li to pokazivaci ili mnozenja, kako znam razliku i sta znaci cijeli taj ispis zapravo?
	  }
  }

  for (i=0;i<100;i++)
  {
	  printf("%d", rez[i]);		//ispis rez pomnozene matrice?
  }

  double end;
  end = omp_get_wtime();
  printf("\n Timer: %f \n", end-start);


  int numThreads, tid;		//ovo automatski stvara niti
  /* This creates a team of threads; each thread has own copy of variables  */
#pragma omp parallel private(numThreads, tid)		//jel # treba postojati?
 {
   tid = omp_get_thread_num();
   printf("Hello World from thread number %d\n", tid);

/* The following is executed by the master thread only (tid=0) */  		/// kako on zna da je to executed by master thread? Vjv jer je rang 0?
   if (tid == 0)
     {
       numThreads = omp_get_num_threads();
       printf("Number of threads is %d\n", numThreads);
     }
 }
 return 0;
}