Re: [HACKERS] Compile timing

> > Not sure why -j2 is not faster than normal -j...
>
> I was just looking at this a little while ago at work. It is not
> faster because gmake does not propagate the "-j2" flag to submakes, on
> the (correct) theory that you might get a geometrically growing system
> load, rather than just keeping two makes running through all the
> subdirectories.
>
> This is the behavior of "-j", unless you specify it without a numeric
> parameter, in which case it *does* allow parallel submakes.
>
> The first time I tried "-j", I did it without reading the man pages
> and without specifying a numeric parameter. It did a magnificent job
> of bringing down my system trying to build ACE/TAO, a *large* Corba
> package. Chewed up all of real memory, then all of swap; not sure if I
> ran out of process slots or memory first but it wasn't pretty. It was
> *very* fast though :)
>

Yes, make -j without a number does so many makes here the compile fails
too, and the load average soars.

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