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testlog.txt
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testlog.txt
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./test.sh
[3J[H[2J
********** Scenario 1 **********
Initializing ...
Creating Hash Queues ... Done
Creating Free List ... Done
Creating Wait Queue ... Done
Setting up Buffer Cache as per figure 3.2 of Maurice J Bach
Setting up Hash Queues ... Done
Setting up Free List ... Done
Ready to go.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ getblk
4
********* Scenario 1 *********
The kernel finds the block on its hash queue, and its buffer is free.
Buffer Marked Busy.
Removed Buffer from Free List.
Buffer Allocated Successfully.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----VB][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜
[3J[H[2J
********** Scenario 2 **********
Initializing ...
Creating Hash Queues ... Done
Creating Free List ... Done
Creating Wait Queue ... Done
Setting up Buffer Cache as per figure 3.2 of Maurice J Bach
Setting up Hash Queues ... Done
Setting up Free List ... Done
Ready to go.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ getblk
18
********* Scenario 2 *********
The kernel cannot find the block on the hash queue, so it allocates a buffer from the free list.
REMOVING FROM OLD HASH QUEUE.
PUTTING IN NEW HASH QUEUE
Kernel DISK access occuring. Status of Block Updated.
Kernel DISK access finished. Status of Block Updated.
BUFFER now contains new and Valid Data. Updating status.
Buffer Allocated Successfully.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-][ 9 : D 18 ----VB]
3 :[ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜
[3J[H[2J
********** Scenario 3 **********
Initializing ...
Creating Hash Queues ... Done
Creating Free List ... Done
Creating Wait Queue ... Done
Setting up Buffer Cache as per figure 3.2 of Maurice J Bach
Setting up Hash Queues ... Done
Setting up Free List ... Done
Ready to go.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ set
3
stat
D
➜ set
5
stat
D
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ---DV-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ---DV-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 9 : D 3 ---DV-][ 4 : D 5 ---DV-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ getblk
18
********* Scenario 3 *********
The kernel cannot find the block on the hash queue. Found free block is marked delayed write.
Marking Buffer OLD. Starting Asynchronous write to disk.
********* Scenario 3 *********
The kernel cannot find the block on the hash queue. Found free block is marked delayed write.
Marking Buffer OLD. Starting Asynchronous write to disk.
********* Scenario 2 *********
The kernel cannot find the block on the hash queue, so it allocates a buffer from the free list.
REMOVING FROM OLD HASH QUEUE.
PUTTING IN NEW HASH QUEUE
Kernel DISK access occuring. Status of Block Updated.
Kernel DISK access finished. Status of Block Updated.
BUFFER now contains new and Valid Data. Updating status.
Buffer Allocated Successfully.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 64 ----VB]
1 :[ 2 : D 17 ----VB][ 3 : D 5 O--DVB][ 4 : D 97 ----V-]
2 :[ 5 : D 98 ----VB][ 6 : D 50 ----VB][ 7 : D 10 ----V-][ 8 : D 18 ----VB]
3 :[ 9 : D 3 O--DVB][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 0 : D 28 ----V-][ 4 : D 97 ----V-][ 7 : D 10 ----V-]
➜
[3J[H[2J
********** Scenario 4 **********
Initializing ...
Creating Hash Queues ... Done
Creating Free List ... Done
Creating Wait Queue ... Done
Setting up Buffer Cache as per figure 3.2 of Maurice J Bach
Setting up Hash Queues ... Done
Setting up Free List ... Done
Ready to go.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ getblk
3
********* Scenario 1 *********
The kernel finds the block on its hash queue, and its buffer is free.
Buffer Marked Busy.
Removed Buffer from Free List.
Buffer Allocated Successfully.
➜ getblk
5
********* Scenario 1 *********
The kernel finds the block on its hash queue, and its buffer is free.
Buffer Marked Busy.
Removed Buffer from Free List.
Buffer Allocated Successfully.
➜ getblk
4
********* Scenario 1 *********
The kernel finds the block on its hash queue, and its buffer is free.
Buffer Marked Busy.
Removed Buffer from Free List.
Buffer Allocated Successfully.
➜ getblk
28
********* Scenario 1 *********
The kernel finds the block on its hash queue, and its buffer is free.
Buffer Marked Busy.
Removed Buffer from Free List.
Buffer Allocated Successfully.
➜ getblk
97
********* Scenario 1 *********
The kernel finds the block on its hash queue, and its buffer is free.
Buffer Marked Busy.
Removed Buffer from Free List.
Buffer Allocated Successfully.
➜ getblk
10
********* Scenario 1 *********
The kernel finds the block on its hash queue, and its buffer is free.
Buffer Marked Busy.
Removed Buffer from Free List.
Buffer Allocated Successfully.
➜ free
➜ getblk
18
********* Scenario 4 *********
The kernel cannot find the block on the hash queue, and the free list of buffers is empty.
Process goes to sleep.
Process will wake up when any buffer becomes free.
➜ hash
0 :[ 0 : D 28 ----VB][ 1 : D 4 ----VB][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----VB][ 5 : D 97 ----VB]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----VB]
3 :[ 9 : D 3 ----VB][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
➜ wait
[ getblk 18 : WAITING FOR ANY BUFFER]
➜ brelse
28
Wakeup processes wating for any buffer
Wakeup processes waiting for buffer of blockNumber 28
Raising CPU level to block interrupts.
Inserting at the head of freelist.
Lowering CPU level to allow interrupts.
UNLOCKING BUFFER.
Woken Up processes now race to obtain this free buffer.
Race Winner is a process WAITING_FOR_ANY_BUFFER and it wants block number 18.
Running getblk for this process with block number 18
********* Scenario 2 *********
The kernel cannot find the block on the hash queue, so it allocates a buffer from the free list.
REMOVING FROM OLD HASH QUEUE.
PUTTING IN NEW HASH QUEUE
Kernel DISK access occuring. Status of Block Updated.
Kernel DISK access finished. Status of Block Updated.
BUFFER now contains new and Valid Data. Updating status.
Buffer Allocated Successfully.
➜ hash
0 :[ 0 : D 4 ----VB][ 1 : D 64 ----VB]
1 :[ 2 : D 17 ----VB][ 3 : D 5 ----VB][ 4 : D 97 ----VB]
2 :[ 5 : D 98 ----VB][ 6 : D 50 ----VB][ 7 : D 10 ----VB][ 8 : D 18 ----VB]
3 :[ 9 : D 3 ----VB][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
➜ wait
➜
[3J[H[2J
********** Scenario 5 **********
Initializing ...
Creating Hash Queues ... Done
Creating Free List ... Done
Creating Wait Queue ... Done
Setting up Buffer Cache as per figure 3.2 of Maurice J Bach
Setting up Hash Queues ... Done
Setting up Free List ... Done
Ready to go.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ getblk
64
********* Scenario 5 *********
The kernel finds the block on the hash queue, but its buffer is currently busy.
Process goes to sleep.
Process will wake up when this buffer becomes free
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 -W--VB]
1 :[ 3 : D 17 ----VB][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ wait
[ getblk 64 : WAITING FOR THIS BUFFER]
➜ brelse
17
Wakeup processes wating for any buffer
Wakeup processes waiting for buffer of blockNumber 17
Raising CPU level to block interrupts.
Inserting at the head of freelist.
Lowering CPU level to allow interrupts.
UNLOCKING BUFFER.
Woken Up processes now race to obtain this free buffer.
No processes want this buffer. Nothing happens.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 -W--VB]
1 :[ 3 : D 17 ----V-][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 3 : D 17 ----V-][ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ wait
[ getblk 64 : WAITING FOR THIS BUFFER]
➜ brelse
64
Wakeup processes wating for any buffer
Wakeup processes waiting for buffer of blockNumber 64
Raising CPU level to block interrupts.
Inserting at the head of freelist.
Lowering CPU level to allow interrupts.
UNLOCKING BUFFER.
Woken Up processes now race to obtain this free buffer.
Race Winner is a process WAITING_FOR_THIS_BUFFER and it wants block number 64.
Running getblk for this process with block number 64
********* Scenario 1 *********
The kernel finds the block on its hash queue, and its buffer is free.
Buffer Marked Busy.
Removed Buffer from Free List.
Buffer Allocated Successfully.
➜ hash
0 :[ 0 : D 28 ----V-][ 1 : D 4 ----V-][ 2 : D 64 ----VB]
1 :[ 3 : D 17 ----V-][ 4 : D 5 ----V-][ 5 : D 97 ----V-]
2 :[ 6 : D 98 ----VB][ 7 : D 50 ----VB][ 8 : D 10 ----V-]
3 :[ 9 : D 3 ----V-][ 10 : D 35 ----VB][ 11 : D 99 ----VB]
➜ free
[ 3 : D 17 ----V-][ 9 : D 3 ----V-][ 4 : D 5 ----V-][ 1 : D 4 ----V-][ 0 : D 28 ----V-][ 5 : D 97 ----V-][ 8 : D 10 ----V-]
➜ wait
➜