[Scons-users] [Scons-dev] Default number of jobs

[Russel Winder]

On Sat, 2012-07-28 at 15:46 -0400, Gary Oberbrunner wrote:
[…]

> I wouldn't want to change the default, I agree.  However I have heard

> requests before for a way to say "use as many cores as the machine

> has" and I can see how that would be nice for some situations.

> Perhaps -jN (literal N) could be made to do that?  If multiprocessing

> isn't available (python too old), it could just use 1. But since it's

> quite easy to do in a SConstruct (or even in a site-scons, I think) it

> doesn't seem as important as a lot of the things we really do need to

> work on.

> 

> (Note that some tools, like the Intel linker in -ipo mode, use your

> whole machine -- running multiple jobs will only slow things down,

> mostly because of swapping.)


Also this strategy of using all cores available by default (which is
what Waf does) is fine on a compile server and fundamentally not a good
thing to do on a workstation, at least if you want to keep the UI
responsive.

-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
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