Re: Memory leak in for loops

[Bernd Eggink]

Jan Schampera schrieb:
> Sandino Araico Sánchez wrote:
>
> >    1.
> >       #!/bin/bash
> >    2.
> >        
> >    3.
> >       for i in {0..c} ; do
> >    4.
> >               echo $i > /dev/null
> >    5.
> >       done
> >
> >
> >
> > Repeat-By:
> >         Run the script above and the process starts leaking memory very
> > fast.
>
> You know what a memory *leak* is, yes? mallocs() without proper free()s.
>
> What you mean is that your memory is used. Feel free to calculate the
> memory that is needed to store the string representation of
> {0..150000000}, I think you will get a number near your RAM size.
>
> J.

... and try

        for (( i = 0; i < 150000000; ++i ))
        do
                echo $i > /dev/null
        done

instead. Consumes nearly no memory at all.

Cheers,
Bernd


--
Bernd Eggink
http://sudrala.de