Re: [Xen-devel] How to minimize the compilation time of the XEN code

[Michael David Crawford <mdc@xxxxxxxxx>]

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
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Michael David Crawford
mdc@xxxxxxxxx

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