Re: [cdt-dev] make -j8 doesnt work with cmake...

[Michael Jackson <mike.jackson@xxxxxxxxxxxxxx>]

I think the way the CDT generator works is to create the CDT projects  
that point to some makefiles. You should be able to use the CDT 4  
generator to generate your projects, but then use a terminal to "make - 
j8" in the build directory to build your project. If that successfully  
saturates your processors then try the same thing inside of Eclipse.  
If using Eclipse does not fully saturate at least 2 of the processors  
then something is definitely wrong. You will also want to "make clean"  
between tests.

I use Eclipse all the time with CMake and compile on multiple cores  
with no problems under OS X 10.5.8 and Linux.

_________________________________________________________
Mike Jackson                  mike.jackson@xxxxxxxxxxxxxx


On Nov 24, 2009, at 9:42 AM, Olexiy Buyanskyy wrote:

> I am not really good expert in cmake, but in gmake -j option does  
> not tell how many processors to use. This option used to allow to  
> run several threads during build if this is possible. If gmake does  
> not see anything to run in several threads if will run it in single  
> thread only. You should not expect usage of 8 cores just because you  
> specified -j8
>
> --
> Olexiy
>
> On Tue, Nov 24, 2009 at 9:26 AM, Nicolas Rannou <Nicolas_Rannou@xxxxxxxxxxxxxxx 
> > wrote:
> When I check the number of cores running during the build (make -j8)  
> (with command "top" for example), only one is working whereas if I  
> build out of eclipse (make -j8) 8 cores are working...
>
> Maybe is that the problem is that I use CDT4 generator and that  I  
> have CDT 6.0 on eclipse....
>
> Nicolas
>
>
> Alena Laskavaia wrote:
> If it is does not work with -j8 for make - it is your makefiles
> problems (or make) not cdt. Why do you think it is not working?
>
> On Mon, Nov 23, 2009 at 1:39 PM, Nicolas Rannou
> <Nicolas_Rannou@xxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> I'm new in eclipse and I encounter some difficulties.
>
> I tried to import my c++ project into Eclipse and to perform a  
> parallel
> build using 8 cores but it doesn't work.
>
> I tried the 3 methods proposed in the tutorials
> (http://www.cmake.org/Wiki/CMake:Eclipse) but no one gives the  
> expected
> result. It always builds my project in 1 core, even if use parallel
> build/jobs is checked or if I had -j8 manually to the make command...
>
> Maybe should I download new components in eclipse or configure  
> something in
> the cmakelists files...?
>
> I use cmake 2.6 and 2.8...
>
> Thanks
>
> Nicolasq