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Re: General request .. Dismal performance of core 3 ..



On Mon, Dec 20, 2004 at 02:12:45PM -0500, Sundara Pandian wrote:
> some real world situations like this is noticeable .
> 
...
> 2. Searching for text in file across a particular directory with
> same number of files
> eg : find /backup -name *.dbf | xargs grep somestring

This is a good time and place to hint at how hard it is to benchmark.
In defense of Fedora it is more 'international' than historic
distributions see below.

Others noted some grep bugs but there is more to this than that bug.
Sometimes it can be unclear that the benchmarks are different even
when the command line is identical.  Simple but hidden environment
settings can have a big impact.  Package configuration options can
do the same thing but more opaquely.

In this case . contains more than enough files to blast DRAM file cache.

    $  echo $LANG
    en_US.UTF-8
    $  time find . -type f -print0 | xargs -0 grep somestringNotExpected2bfound

    real    56m3.461s
    user    37m46.166s
    sys     2m16.925s

    $  export LANG=C
    $  echo $LANG
    C
    $  time find . -type f -print0 | xargs -0 grep somestringNotExpected2bfound

    real    24m14.130s
    user    0m27.026s
    sys     1m37.820s


This is a big delta..... on the same FC2 system.
YMMV...

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