partitioning (operatimg system ).

 WHAT IS PARTITIONING ?

Certain operating system use partitioned memory management to allow multiprogramming .

• Partitioning means dividing main memory into various sections.

 • These section are called as partitions.

 • There are two types of partitions:

1) fixed partition .    2) variable partition.

  Fixed partition  .

 • In this method partitions are fixed at the time of system generation . At this time , system manager has to declear partition time.

 • Fixed partition are also called static partition . On declearing fixed partition , the operating system create partition description table.

 • It reduces the uses the CPU utiliisation .

 • It reduces the degree of multiprogramming. .

   variable partition .

    In variable partition number of partition and their size are variable 

• They are not defined at the time of system generation .

 • These partition are created by operating systems at run time they differ in size. 

• The procedure to be followed for memory allocation is nearly same as that in case of fixed partition .