Re: [Gnu-arch-users] Slow inventories on large source trees

[Aaron Bentley]

According to gprof, it's spending 78% of its time doing regex matching 
in filename_matches.  The lion's share of that is in mem_set0, but 
you've got to consider that it's doing 9 hundred thousand calls.

It's calling filename_matches 89750 times -- about 21 times per file in 
the Wine tree, so I suspect that can be reduced, hopefully to single digits.

Otherwise, we'd have to speed up regex matching.

Aaron

Mike Hearn wrote:
> Hi,
>
> On the WineHQ source tree, with an in-tree build, doing tla inventory
> --ids >/dev/null takes approximately 20 seconds on my athlon 1200 with
> 256mb of ram.
>
> This makes certain operations extremely slow, and this is problematic for
> us (the Wine developers thinking of adopting arch).
>
> The total source tree when a complete build has been done is approximately
> 560mb of data.
>
> I haven't tested with an out-of-tree build - while I suspect performance
> would be better, I'm really not sure we want to ask everyone to do
> out-of-tree builds to work around this slowness in arch.
>
> Are there any ideas for how to optimize this? The CVS gateway tree is
> using names tagging, though a real switch to arch would be using explicit
> tags in future.
>
> thanks -mike
>
>
>
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--
Aaron Bentley
Director of Technology
Panometrics, Inc.