It is very well-known that Vector clocks detect causal dependencies between events, but there are different implementation methods. What are the differences (advantages/disadvantages) between:
It is suppose to tick right before sending and also tick right before receiving. The word right before here means the event represented send/receive will have the vector clock timestamp of right after the vector clock has just been updated with a tick.
The reason is because there are 2 processes, the sender process and the receiver process.
It needs to tick the sending event so that the sender process is aware that a send event has just occurred. Correspondingly, it also needs to tick in the receiving event so that the receiver process is aware that a receive event has just occurred.
Otherwise, it would violate Lamport's happened before relation in either sender or receiver if a tick did not occur there.
