Calculation is in sequence instead of concurrent

Getting Help
1

https://play.golang.org/p/yMvf6pPEo0C

I am new to golang trying to understand concurrency pattern in golang
I am trying to calculate square of set of numbers concurrently but every time it’s calculating in sequential manner. i.e from 0 to 25 in sequence. Am I doing something wrong ?
Any help would be appreciated. Thanks in advance.

2

The calculation is so fast that the order of items is kept. Try to sleep between reading from jobs and writing to results:

	for n := range jobs {
		time.Sleep(10 * time.Millisecond)
		results <- square(n)
	}

This way the order changes:

$ ./square
1
4
0
25
9
16
49
64
...

see https://play.golang.org/p/P7ek45wtR0-

1 Like
3

Thanks for replying. Can you please explain why sleeping between reads or writes changes the order?

4

The execution is so fast that one worker does all the calculations and the others have not even started yet. The sleeping gives a chance to the other workers to do their job.

1 Like
5

Now I understood. Thanks for replying.

6

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