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Re^3: random behaviour of perl hashes

by swampyankee (Parson)
on Aug 28, 2006 at 20:48 UTC ( #570046=note: print w/ replies, xml ) Need Help??


in reply to Re^2: random behaviour of perl hashes
in thread random behaviour of perl hashes

I get this running ActiveState's 5.8.8 (build 817):

Case 1 salt shaken onions diced pepper fresh paprika spicy potatos diced Case 2 salt shaken onions diced pepper fresh paprika spicy potatos diced Case 3 salt shaken onions diced pepper fresh paprika spicy potatos diced

I suspect that it has to do with the details of the implementation of the hashing algorithm, which may differ from system to system.

My interpretation of the "random ordering" in the perldocs is simply that "we refuse to guarantee the order of the keys for a hash".

emc

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein


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Re^4: random behaviour of perl hashes
by liz (Monsignor) on Aug 28, 2006 at 20:57 UTC
    According to "perlrun":

    The default behaviour is to randomise unless the PERL_HASH_SEED is set. If Perl has been compiled with "-DUSE_HASH_SEED_EXPLICIT", the default behaviour is not to randomise unless the PERL_HASH_SEED is set.

    perhaps ActiveState Perl is compiled with -DUSE_HASH_SEED_EXPLICIT ?

    perl -V
    might tell you whether that is the case.

    Liz

      perl -v returns (among many other data):

      -GF -W3 -MD -Zi
      -DNDEBUG -O1 -DWIN32
      -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT
      -DNO_HASH_SEED
      -DUSE_SITECUSTOMIZE -DPERL_IMPLICIT_CONTEXT
      -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSVCRT_READFIX

      It would seem not, unless -DNO_HASH_SEED has a similar effect.

      emc

      Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

      Albert Einstein

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