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From: adi (adisatunet.com)
Date: Thu Feb 22 2001 - 22:42:41 CST

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    > 2 - Anyone tried the performance difference for running postmap on
    > a large file, say:
    >
    > % grep -v '[A-Z]' /usr/dict/words | sed 's/.*/& &/;20000q' >junk
    > % /usr/bin/time postmap hash:junk
    > % /usr/bin/time postmap tdb:junk
    > % /usr/bin/time postmap dbm:junk

    My postfix didn't compiled to support dbm:

    adipostfix:~/.scripts > cat tdb
    grep -v '[A-Z]' /usr/dict/words | sed 's/.*/& &/;20000q' >junk
    /usr/bin/time postmap hash:junk
    /usr/bin/time postmap tdb:junk

    adipostfix:~/.scripts > tdb
    2.52user 0.06system 0:02.72elapsed 94%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (194major+183minor)pagefaults 0swaps
    1.43user 0.30system 0:01.73elapsed 100%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (12830major+27minor)pagefaults 0swaps

    adipostfix:~/.scripts > tdb
    2.56user 0.03system 0:02.73elapsed 94%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (194major+183minor)pagefaults 0swaps
    1.40user 0.35system 0:01.90elapsed 91%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (12830major+27minor)pagefaults 0swaps

    adipostfix:~/.scripts > tdb
    2.55user 0.03system 0:02.71elapsed 95%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (194major+183minor)pagefaults 0swaps
    1.46user 0.26system 0:01.72elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (12830major+27minor)pagefaults 0swaps

    adipostfix:~/.scripts > uname -a
    Linux postfix 2.4.0-test12 #2 Mon Dec 4 09:48:23 JAVT 2000 i586 unknown

    Regards,

    P.Y. Adi Prasaja