Re: parallelism: job slots vs. levels

[Howard Chu]

Dan Jacobson wrote:

> Anyways,
> $ make x& make y& wait
> cannot always be rewritten with -j.
> $ make -j[whatever number] x y
> will act differently except for special cases of x and y;
> probably when both x and y have no dependencies.

  make x& make y& wait

will only work correctly if x and y have no dependencies in common. 
Otherwise, the two separate make's will get in each other's way when 
they work on whatever is in common. This fact has nothing to do with 
parallel make or "make -j".

> Anyways, with -j examples added to the manual, we would get on the
> right track about how to use -j.

Since your two examples have nothing to do with each other, I don't see 
how you can reach this conclusion.
--
  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
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