Building speed on multi-cpu systems

[Michael Pyne]

On Saturday 21 February 2009, Alex Merry wrote:
> On Sunday 22 February 2009 00:18:22 Andriy Rysin wrote:
> > I have a 2-core cpu so I was trying to improve KDE compile speed and the
> > quickest solution I could come up with to put "-j 4" in the makeobj
> > script in the make command call (build speed was up ~30% and I in a
> > monitor I can see all cores are fully busy now). Though this solution
> > feels a bit hackish so I was wandering if there's a better/standard way
> > to do that? If makeobj is the right place may be we could make it more
> > generic so it tries to detect number of cores automagically (at least for
> > some most popular platforms)?
>
> Well, you could just pass -j4 to makeobj, which will pass it on to make. 
> The best place to put that depends on what you use to build kde.  If you
> use the bash scripts on techbase, then you can just edit the cmakekde
> function, which uses -j2 by default.
>
> Alex

Mind you probably the best option is -j 3 for a dual-core system (number of 
CPUs + 1).  The one extra process is going to be the one doing I/O, the others 
will either be doing work on a CPU core or stuck waiting for I/O, so CPUs + 2 
doesn't really help much.

Regards,
 - Michael Pyne

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