Explain the concept of variable-partition contiguous storage allocation.

Suppose that we have 1024K main memory available in that 128K is occupied through operating system program. Now there are 4 jobs waiting for memory allocation into a job queue Applying FCFS scheduling policy, so Process 1, Process 2 and Process 3 can be instantly allocated in memory. Process 4 can't be accommodated since there is there is not sufficient space.

• A hole of 64K is left after loading 3 processes: not sufficient room for other process.
• Finally each process is blocked. The operating system swaps out process 2 to bring in process 4.

• The other hole of 96K is created.
• Finally each process is blocked. The operating system swaps out process 1 to bring into again process 2 and other hole of 96K is created.