[Qt5-feedback] Build system requirements for Qt5

[Thiago Macieira]

Em Wednesday, 8 de June de 2011, às 20:35:54, Alexander Neundorf escreveu:
> > "full speed parallel build of the project
> > on the 50 nodes of the local build farm" 
> 
> make -j50 is not good enough ?

No. For one thing, I don't want to link 50 libraries at the same time. The 50 
nodes on the local build farm don't mean 50 processors locally. The system 
needs to be more intelligent and know that it can only link one or two 
libraries at at time (linking is I/O intensive, so it's not the number of 
processors that is at stake).

Another thing is that I don't want moc to be run 50 times either on my dual-
core or even on my hyperthreaded quad-core.

To go one step further, I don't want to know that the farm has 50 nodes. And 
even if I did, I don't know how many nodes I can saturate in the farm. So I 
don't want to launch the compiler wrapper 50 times without if the farm can 
only handle 16 jobs at the same time.

The buildsystem needs to know from the farm coordinator that it can launch 
this specific job now.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
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