Re: [go-nuts] rand seed using 'time.Now().Unix()' consequence mass common rand numbers, but using unixNano as the seed will not ,how to choose the rand's seed between 'time.Now().Unix()' and 'time.Now().UnixNano()' ?

[Burak Serdar]

On Wed, Jun 26, 2019 at 8:17 PM Chou Yan <yan.chou.str...@gmail.com> wrote:
>
> I use:
> r:=rand.New(rand.NewSource(time.Now().Unix()))
> r..Intn(96)

How are you generating multiple random numbers? If your loop that
generates these numbers include the r:=rand.New(...), then you're
essentially seeding the random number generator with the same number,
because the program ends before time.Now().Unix() returns a different
value every second.

Move the r:=rand.New(...) outsite the for loop.

> I got:
>
> and val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 39
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> rand val: 82
> ...
> mass common sequential number .
> But if I change that：
> r:=rand.New(rand.NewSource(time.Now().UnixNano()))
> It will not happen.
> Why does this happened? and how do I choose it between time.Now().Unix() or 
> UnixNano()?
>
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