On 27/07/06, Brian D. McGrew <[email protected]> wrote:
Good morning all! Currently I'm building my kernels on a Dell PE 1800 3.0GHz. My dilemma is that I build and rebuild the kernel about twenty times a day and even though it only takes about 20 minutes, that's rapidly becoming too slow! Today it's the 2.6.17 kernel on FC5 that I'm building with. I see all these blurbs out there about someone being able to build a complete kernel in under a minute or running an SMP build across multiple CPUS and/or multiple machines. So, to ask the group that should know the best ... What would be a reasonable configuration to get my builds down under five minutes or so?
My box builds my ordinary .config (attached) in under 5min : $ time make -j3 real 3m58.047s user 4m54.574s sys 1m24.202s Here are some more numbers for you to compare to your box : allnoconfig : $ make clean $ make allnoconfig $ time make -j3 real 0m54.544s user 1m2.113s sys 0m20.781s allmodconfig : $ make clean $ make allmodconfig $ time make -j3 real 28m49.748s user 35m3.212s sys 10m43.633s This box uses a Athlon64 X2 4400+ CPU, has 2GB RAM and a single Ultra160 SCSI disk. It's currently running an i386 kernel, not x86_64, so it's probably not performing to it's full potential atm.
And then to go to the extreme, what kind of horsepower should I be looking for if I want get the build times down to say a minute or so???
Make sure you have a fast disk and adequate amounts of RAM so you don't end up swapping, then add more CPU's. A dual-core box is not too expensive these days and an additional core really speeds things up. If you have the money for it, then a box with two dual-core CPU's is ofcourse even better. If you have several machines, then you can use distcc (http://distcc.samba.org/) to distribute the build across the boxes - that's an easy way to speed things up if you have a bunch of older computers lying around. -- Jesper Juhl <[email protected]> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html
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