This was not the problem.

The problem was, that I was using "Run" from within Juno. In that case, the 
result 
of @benchmark is not printed.
Using:
println(@benchmark xxxx)
solved the problem.

Uwe

On Monday, November 14, 2016 at 3:12:31 PM UTC+1, Yichao Yu wrote:
>
> On Mon, Nov 14, 2016 at 8:16 AM, Uwe Fechner <uwe.fec...@gmail.com 
> <javascript:>> wrote: 
> > Hello, 
> > 
> > why does the following code not work (no benchmark result shown, no 
> error 
> > message or warning): 
> > using BenchmarkTools 
> > 
> > function add2!(vec, result) 
> >     """ Calculate the sum of two 3d vectors and store the result in the 
> > second parameter. """ 
> >    [result[i] =  vec[i] + result[i] for i in [1, 2, 3]] 
> >    return nothing 
> > end 
> > 
> > function main() 
> >     vec1=(1.0,2.0, 3.0) 
> >     result=zeros(3) 
> >     add2!(vec1, result) 
> >     println(result) 
> >     @benchmark add2!($vec1, $result) 
> > end 
> > 
> > main() 
> > 
> > Any hints welcome! 
>
> Use @benchmark in global scope and don't use comprehension as loop. 
>
> > 
> > Uwe 
>

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