Concept: In this the memory is divided in two parts and process is fit into it. The process which is best suited in to it is placed in the particular memory where it suits. We have to check memory partition. If it suits, its status should be changed
ALGORITHM:
Step1: Start the process.
Step2: Declarevariables.
Step3: Enter total memory size ms.
Step4: Allocate memory for os.
Ms=ms-os
Step5: Read the no partition to be divided n Partition size=ms/n.
Step6: Read the process no and process size.
Step 7: If process size is less than partition size allot alse blocke the process. While allocating update memory wastage-external fragmentation.
if(pn[i]==pn[j])
f=1;
if(f==0){
if(ps[i]<=siz)
{
extft=extft+size-ps[i];
avail[i]=1;
count++;
}
}
Step 8: Print the results
Step 9 :Stop.
#include<stdio.h>
#include<conio.h>
int main()
{
int m,p,s,p1;
int m1[4],i,f,f1=0,f2=0,fra1,fra2,s1,pos;
clrscr();
printf("Enter the memory size:");
scanf("%d",&m);
printf("Enter the no of partitions:");
scanf("%d",&p);
s=m/p;
printf("Each partn size is:%d",s);
printf("\nEnter the no of processes:");
scanf("%d",&p1);
pos=m;
for(i=0;i
{
if(pos
{
printf("\nThere is no further memory for process%d",i+1);
m1[i]=0;
break;
}
else
{
printf("\nEnter the memory req for process%d:",i+1);
scanf("%d",&m1[i]);
if(m1[i]<=s)
{
printf("\nProcess is allocated in partition%d",i+1);
fra1=s-m1[i];
printf("\nInternal fragmentation for process is:%d",fra1);
f1=f1+fra1;
pos=pos-s;
}
else
{
printf("\nProcess not allocated in partition%d",i+1);
s1=m1[i];
while(s1>s)
{
s1=s1-s;
pos=pos-s;
}
pos=pos-s;
fra2=s-s1;
f2=f2+fra2;
printf("\nExternal Fragmentation for this process is:%d",fra2);
}
}
}
printf("\nProcess\tallocatedmemory");
for(i=0;i
printf("\n%5d\t%5d",i+1,m1[i]);
f=f1+f2;
printf("\nThe tot no of fragmentation is:%d",f);
getch();
return 0;
}
OUTPUT: Enter the memory size: 80 Enter the no of partitions: 4 Each partition size: 20 Enter the number of processes: 2 Enter the memory req for process1: 18 Process1 is allocated in partn1 Internal fragmentation for process1 is: 2 Enter the memory req for process2: 22 Process2 is not allocated in partn2 External fragmentation for process2 is: 18