Xen devel - Sep 2009 - How to minimize the compilation time of the XEN code

Hi, all

I have a question about how to minimize the compilation time of the  XEN code.

During my xen development, sometimes I modify just the xen code, and sometimes
just the domain0 code, or sometime both.

For the just xen code modification case, I tested in my machine and it took
about 15 minutes.(My cpu is intel dual 1.6GHZ and I run the compile through the
make dist command on the vmware on the windows XP platform). It''s a too
long waiting time for me............

Is there any optimized option avaiable on the "make" command then it
will cost least time in the above 3 case respectively?  (I always use the
"make dist" now).

Thanks & Best Regards


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On 01/09/2009 09:11, "Wen.Tian" <tyd126723@huawei.com> wrote:
> During my xen development, sometimes I modify just the xen code, and
sometimes
> just the domain0 code, or sometime both.
>  
> For the just xen code modification case, I tested in my machine and it took
> about 15 minutes.(My cpu is intel dual 1.6GHZ and I run the compile through
> the make dist command on the vmware on the windows XP platform).
It''s a too
> long waiting time for me............
>  
> Is there any optimized option avaiable on the "make" command then
it will cost
> least time in the above 3 case respectively?  (I always use the "make
dist"
> now).
You can use the -j option to make to build in parallel, which speeds things
up quite a bit. Also there are build targets ''xen'' and e.g.,
''linux-2.6-xen0-build'' to build Xen and a 2.6.18 dom0,
respectively.
E.g., ''make -j8 xen'', ''make -j8
linux-2.6-xen0-build''

 -- Keir



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Keir Fraser wrote:
> You can use the -j option to make to build in parallel, which speeds things
> up quite a bit. 
In my tests on a quad core Xeon, I found that it was fastest to have 
more jobs than cores.  That is, with my four cores, it was best to say 
"-j 8".

The reason that works I think is that sometimes a job is blocked waiting 
for I/O.  During that time a compute-bound job can run.  If you only 
have as many jobs as cores, sometimes a core will be idle when its 
process is blocked.

The best number of jobs will be highly dependent on your configuration 
though.  It''s worthwhile to test using the "time" command:

time make -j 8

Mike
-- 
Michael David Crawford
mdc@prgmr.com

    prgmr.com - We Don''t Assume You Are Stupid.

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