Re: Figured out how to get Mozilla into git

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On Mon, 19 Jun 2006, Martin Langhoff wrote:
> 
> No problems here with my latest import run. fsck-objects --full comes
> clean, takes 14m:
>
> /usr/bin/time git-fsck-objects --full
> 737.22user 38.79system 14:09.40elapsed 91%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (20807major+19483471minor)pagefaults 0swaps

It takes much less than that for me: 

	408.40user 32.56system 7:22.07elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
	0inputs+0outputs (145major+13455672minor)pagefaults 0swaps

and in particular note the much lower minor pagefaults number (which is a 
very good approximation of total RSS). Mine is with all the memory 
optimizations in place, but I didn't see _that_ big of a difference, so 
there's something else in addition.

However, the fact that I get "SHA1 mismatch with itself" is strange. The 
re-pack will always re-generate the SHA1, so I worry that this is perhaps 
some PPC-specific bug in SHA1 handling (and it's entirely possible that 
it's triggered by doing a SHA1 over a 500+MB area).

The fact that you don't see it is indicative that it's somehow specific to 
my setup.

> BTW, that import (with the latest code Junio has) took 37hs even with
> the aggressive repack -a -d. I want to bench it dropping the -a from
> the recurrring repack, and doing a final repack -a -d.

Yeah, that's probably the right thing to do. The "-a" is ok with tons of 
memory, and I'm trying to make it ok with _less_ memory, but it's probably 
just not worth it.

		Linus
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