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1. #DIFFERENCE BETWEEN PARALLEL AND MULTIBROWSER TESTING CODE#
2. #DIFFERENCE BETWEEN PARALLEL AND MULTIBROWSER TESTING SERIES#

Then at the end we sum the results from each worker to get 10 + 35 = 45.Īgain, this parallelism was only possible because consecutive additions have the property of concurrency.Ĭoncurrency can be leveraged by more than just parallelism though. Thus parallel computing leverages the property of concurrency to execute multiple units of the program, algorithm, or problem simultaneously.Ĭontinuing with the example of consecutive additions, we can execute different portions of the sum in parallel: Execution unit 1: 0 + 1 + 2 + 3 + 4 = 10 Parallel Computing: a type of computation in which many calculations or the execution of processes are carried out simultaneously 3 4. Here I have grouped numbers into pairs that will sum to 10, making it easier for me to arrive at the correct answer in my head. I have tried to link to various sources or wikipedia pages so others can affirm correctness.Ĭoncurrency: the property of a system which enables units of the program, algorithm, or problem to be executed out-of-order or in partial order without affecting the final outcome 1 2.Ī simple example of this is consecutive additions: 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45ĭue to the commutative property of addition the order of these can be re-arranged without affecting correctness the following arrangement will result in the same answer: (1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5 + 0 = 45 I believe this answer to be more correct than the existing answers and editing them would have changed their essence. But it also means that "busy loops" won't work - you can't set a timeout and then loop until it fires, because the loop will prevent the timeout callback from executing. This is important to know, because it guarantees that any function you write is atomic - no callback can interrupt it until it returns.

#DIFFERENCE BETWEEN PARALLEL AND MULTIBROWSER TESTING CODE#

coroutines): split both tasks up into atomic steps, and switch back and forth between the two.īy far the best known example of non-parallel concurrency is how JavaScript works: there is only one thread, and any asynchronous callback has to wait until the previous chunk of code has finished executing. Another popular solution is interleaved processing (a.k.a.

Parallelism is one way to implement concurrency, but it's not the only one. Put boldly, concurrency describes a problem (two things need to happen together), while parallelism describes a solution (two processor cores are used to execute two things simultaneously). Parallelism means that two or more calculations happen simultaneously. This is why our homes are wired up with parallel circuits.The two concepts are related, but different.Ĭoncurrency means that two or more calculations happen within the same time frame, and there is usually some sort of dependency between them. Parallel circuits are useful if you want components to continue to work, even if one component has failed.

#DIFFERENCE BETWEEN PARALLEL AND MULTIBROWSER TESTING SERIES#

And, unlike a series circuit, the lamps stay bright if you add more lamps in parallel. In a parallel circuit, if a lamp breaks or a component is disconnected from one parallel wire, the components on different branches keep working. A circuit with a battery and two lamps connected in parallel. If you follow the circuit diagram from one side of the cell to the other, you can only pass through all the different components if you follow all the branches.

In parallel circuits different components are connected on different branches of the wire. They also use less wiring than parallel circuits. Series circuits are useful if you want a warning that one of the components in the circuit has failed. In a series circuit, if a lamp breaks or a component is disconnected, the circuit is broken and all the components stop working. If you put more lamps into a series circuit, the lamps will be dimmer than before. If you follow the circuit diagram from one side of the cell to the other, you should pass through all the different components, one after the other, without any branches.Ī circuit with a battery and two lamps connected in series You get several components one after the other. In a television series, you get several episodes, one after the other. If there are branches it's a parallel circuit. If there are no branches then it's a series circuit. The components in a circuit are joined by wires. There are two types of circuit we can make, called series and parallel.