Re: make -j 4 is really make -j 8 for buildworld?

Marc Olzheim wrote:

>On Wed, Jan 14, 2004 at 07:26:12AM +0100, Poul-Henning Kamp wrote:
>  
>
>>The N in -jN is a relative measure of parallelism which has nothing
>>to do with how many processes are run.  That depends on parallism in
>>the Makefiles and how subdirs are entered.
>>    
>>
>
>Hmm.. From the manual page:
>
>     -j max_jobs
>             Specify the maximum number of jobs that make may have running at
>             any one time.  Turns compatibility mode off, unless the B flag is
>             also specified.
>
>'maximum number of jobs' seems to be quite clear to me... Or is the -j
>propagated into subdirs ?
>
>Zlo
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>  
>
If a make file can specify more than one job in any instance, then thats 
why.  You would run -j4 and have 4 jobs working, but when job number x 
is running it spawns 2 or more jobs to compile indepndent portions of 
code in a program faster.  In something like gnome or kde this must be 
very common.  I have no idea if this is right, but if I worked on a big 
project that is how I would chose to write the make file if I could.  
Maybe you should ask this on the hackers list?
Jason