LabVIEW
what is the purpose of using parallelism and chunk in for loop
Have you tried pressing the help button on the parallelism configuration page? You also already got a good link above.
If the outputs of each iteration are independent of each other, the compiler can spread the problem over multiple CPU cores, calculating several iterations in parallel, then assembling the result at the end in the correct order. Typically, the way the problem is split over multiple CPU cores is automatic and you don't need to worry about it. In very rare cases you might want better control and define the chunk size directly.
Note that the splitting and re-assembling introduces a certain amount of overhead so you should do some careful benchmarking to ensure that the process is worth it compared to serial execution in a plain FOR loop.
