Speed up build phase with "make -j"

[Weissmann Markus]

On 30.10.2007, at 12:13, Anders F Björklund wrote:

>> I'd rather encourage a mechanism for port that provides a  
>> mechanism for port authors to know how many processors there are  
>> and to enable parallel builds if they know this to work.
>> Perhaps a switch "use_parallel_build [yes|no]" that will add "-j  
>> 2*CPUS" to build.args.
>
> There's a bunch of other influences, such as number of cores and  
> amount of RAM and whether the build is using some bloated language  
> like C++ and many other considerations, for the -j parameter.
>
> So in the end I just made it an integer (build.jobs), and left the  
> heuristics up to the user :-)
>
> --anders
>
> PS. There's also a build.nice, if you want to go the other route  
> (build slower, like in background)
>

Yes, but I meant this to be a per-Portfile choice so a maintainer can  
mark his/her port as being able to build in parallel. Doing this with  
the sledgehammer for all ports that use 'make' might be a bit too  
much. ;)

For build.nice it might be cool++ to do change the nice level for port 
(1) directly so all phases run with low priority, not just the build  
phase.


-Markus

---
Markus W. Weissmann
http://www.mweissmann.de/