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Subject: Re: Building Rockbox faster with make -j

Re: Building Rockbox faster with make -j

From: Jonathan Gordon <>
Date: Thu, 5 Mar 2009 18:56:53 -0800

2009/3/5 Boris Gjenero <>:
> Hello,
> By default GNU make runs one job at a time.  This fails to take
> advantage of multiple cores and/or multiple CPUs on the system that's
> doing the building.  With the -j option one can specify how many jobs
> to run at a time.  I have a 4-core Intel Q6600 CPU, and -j 4 cuts the
> build time in half, from about 10 minutes to about 5 minutes.  Rockbox
> seems to build correctly; what I got with -j 4 is identical to what I
> get without the -j option.  The only disadvantage is that output
> messages from different jobs can be intermingled.
> Here is some info on this GNU make option:
> For now I've still been avoiding this option because when working on
> other patches or bugs I do not want to have potential problems from
> the build process.  Is it okay to use the option?
> Regards,
> Boris

we have had build problems before with dependancies usin it, but hey
are always fixed... I would guess all the build servers are using -j
Received on 2009-03-06

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