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

[Aaron Bentley]

Andrew Suffield wrote:
> On Wed, Apr 21, 2004 at 12:48:55PM -0400, Aaron Bentley wrote:
>
> > 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.
>
>
> I would be interested to know how memset(..., 0, ...) behaves (#define
> mem_set0 to that), since at least in theory, mem_set0 is between 10
> and 100 times slower than memset() on an athlon (and around 10 times
> on a pentium 3 or 4).

tla inventory is about 50% faster when memset is substituted in the 
regexp functions:

real    0m4.192s
user    0m4.110s
sys     0m0.080s

(hot cache)

address@hidden/hackerlab--hacked--0--patch-1

Aaron
--
Aaron Bentley
Director of Technology
Panometrics, Inc.