Re: GENERIC make buildkernel error / fails - posix_fadvise

On Thu, 12 Jan 2012 21:37:27 -0600, Joe Ennis <joe@whiskey7.net> wrote:

> On Thu, 12 Jan 2012 19:11:54 -0800
> Garrett Cooper <yanegomi@gmail.com> wrote:
>
>> On Thu, Jan 12, 2012 at 5:52 PM, Doug Barton <dougb@freebsd.org>
>> wrote:
>> >
>> >>> chflags -R noschg /usr/obj/usr
>> >>> rm -rf /usr/obj/usr
>> >
>> > It's much faster to do:
>> >
>> > /bin/rm -rf ${obj}/* 2> /dev/null || /bin/chflags -R 0 ${obj}/* &&
>> > /bin/rm -rf ${obj}/*
>>

Thanks of the tip!  Should this be run from inside /usr/src or does it  
matter?

>> +1. And it's faster yet when you can run parallel copies of rm on
>> different portions of the directory tree (e.g. xargs, find [..] -exec)
>> as rm is O(n).
>> Cheers,
>> -Garrett
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>
> What I've been doing just before I do a make buildworld/buildkernel
> is:
>
> mdmfs -s2g md1 /usr/obj
>
> on a clean /usr/obj . If I need to recompile before a boot, just umount
> and recreate.
>
> Provides a little performance boost too.
>
> Regards,

That's a nifty little tip.  I may try that next time.

-- 
Andre Goree
andre@drenet.info
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