In starting only P1 will be available in the ready queue and then at time 1 and 2 process P2 and P3 will arrive
Execution in highest priority level (Order in ready queue: P1P2P3)
0 1ms ----P1 // P1 down graded to the 1st lower priority level ready queue
1 2ms ----P2 // P2 down graded to the 1st lower priority level ready queue
2 3ms ----P3 // P3 down graded to the 1st lower priority level ready queue
Execution in 1st lower priority level (Order in ready queue: P1P2P3)
3 4ms ----P1 // P1 CPU time is completed. Now CPU will move to I/O state
4 6ms ----P2 // P2 down graded to the 2nd lower priority level ready queue
6 8ms ----P3 // P3 down graded to the 2nd lower priority level ready queue
At 7ms P1 will complete its I/O operation and and move to 2nd lower priority level ready queue
Execution in 2nd lower priority level (Order in ready queue: P2P1P3)
8 9ms ----P2 // P2 CPU time is completed. Now CPU will move to I/O state
9 11ms ----P1 // P1 CPU time is completed. Now CPU will move to I/O state
11 15ms ----P3 // P3 down graded to the 3rd lower priority level ready queue
At 13ms P2 will complete its I/O operation and and move to 3rd lower priority level ready queue while at 14ms P1 will complete its I/O operation and and move to 3rd lower priority level ready queue
Execution in 3rd lower priority level (Order in ready queue: P2P1P3)
15 19ms ----P2 // P2 CPU time is completed. Now CPU will move to I/O state
19 21ms ----P1 // P1 CPU time is completed. Now CPU will move to I/O state
21 29ms ----P3 // P3 will execute at this time.
Sequence of execution for every 1 ms: 12312233211333322221133333333
If you're still having any doubt then please feel free to ask in the comment section.
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