linux-kernel - Re: New thread RDSL, post-2.6.20 kernels and amanda (tar) miss-fires

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Date:	Tue, 13 Mar 2007 23:19:22 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Gene Heskett <gene.heskett@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: New thread RDSL, post-2.6.20 kernels and amanda (tar) miss-fires

> On Wednesday 14 March 2007, William Lee Irwin III wrote:
> >On Tue, Mar 13, 2007 at 11:31:53PM -0400, Gene Heskett wrote:
> >> Now, can someone suggest a patch I can revert that might fix this? 
> >> The total number of patches between 2.6.20 and 2.6.21-rc1 will have me
> >> building kernels to bisect this till the middle of June at this rate.
> >
> >4 billion patches could be bisected in 34 boots. Between 2.6.20 and
> >2.6.21-rc1 there are only:
> >
> >$ git rev-list --no-merges v2.6.20..v2.6.21-rc1  |wc -l
> >3118
> >
> >patches, requiring 14 boots. In general ceil(log(n)/log(2))+2 boots.
> >
> >Of course, this is a little optimistic because it assumes no additional
> >breakage occurring at the various bisection points. In any event,
> >assuming (pessimistically) 10 minutes per build, this is 280 minutes or
> >4 hours and 40 minutes of build time. I estimate the process should
> >complete well before Friday of this week, never mind June.
> 
On Wed, Mar 14, 2007 at 02:09:57AM -0400, Gene Heskett wrote:
> Chuckle, sorry to disappoint you wli, on that 32 cpu Niagra Con was 
> calling 'poor equipment', maybe.
> Even using  ccache, its about 15-18 minutes per build, with another 10 to 
> edit my build script and construct the kernel tree with the proper 
> patches applied.  Then a reboot, probably 10 minutes by the time I get 
> the nvidia driver installed for the new kernel and get startx'd, then its 
> another 2 hours or a bit less for an amanda run to test it.

2 hours, 48 minutes times 13 boots (see the correction post) is 36
hours, 24 minutes. One attempt a day (24 hours instead of 2 hours, 48
minutes) yyields 2 weeks. So you're still done by April, not June.


-- wli
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