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

From: Tom Lord
Subject: Re: [Gnu-arch-users] Slow inventories on large source trees
Date: Thu, 22 Apr 2004 12:16:36 -0700 (PDT)

    > From: Aaron Bentley <address@hidden>

    > 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

Is GCC inlining memset or are you getting a libc version?   Either way
-- might be fairer to compare with a mem_set that is compiled with


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