problem with parallel foreach

[thedeemon via Digitalmars-d-learn]

On Tuesday, 12 May 2015 at 14:59:38 UTC, Gerald Jansen wrote:

> The output of /usr/bin/time is as follows:
>
> Lang Jobs    User  System  Elapsed %CPU
> Py      2   79.24    2.16  0:48.90  166
> D       2   19.41   10.14  0:17.96  164
>
> Py     30 1255.17   58.38  2:39.54  823 * Pool(12)
> D      30  421.61 4565.97  6:33.73 1241

The fact that most of the time is spent in System department is 
quite important. I suspect there are too many system calls from 
line-wise reading and writing the files. How many lines are read 
and written there?