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A process is one coherent set of instructions that an OS is currently executing. Everything else pretty much follows from that. For instance, a process resides in memory, and each one has its own state. If your computer is running four instances of Bash simultaneously (not an uncommon situation), they are all the same program, but four different processes. ...


If you're talking about the difference between 2 ticks and 3 ticks, it could simply be that, for a given execution, you started counting ticks early or late in a single tick cycle, and that the execution times are actually identical. You should look into using timers with a higher precision than ticks; ticks are a very coarse measurement.

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