FWIW these are the memory savings as reported by pslist 
it begins      0.734375  WVM: 21976 { WS: 5948 VM: 3164 } 
after perl add      2.078125  WVM: 157152 { WS: 120132 VM: 117276 } 
after perl get      0.75  WVM: 157152 { WS: 120140 VM: 117276 } 
after free perl      1.5  WVM: 153184 { WS: 74936 VM: 72072 } 


it begins      0.4375  WVM: 21976 { WS: 5948 VM: 3164 } 
after jAdd      3.734375  WVM: 50648 { WS: 35500 VM: 32644 } 
after jGet      3.84375  WVM: 50648 { WS: 35512 VM: 32644 } 
after jFree      1.171875  WVM: 50716 { WS: 7988 VM: 5092 }

[download]

And the Judy code 

BEGIN {
    my $j_str_to_int;
    my $j_int_to_strPtr;
    sub jAdd {
    ##    my( $int, $str ) = @_;
        Judy::SL::Set( $j_str_to_int, $_[1], $_[0] );
        Judy::L::Set( $j_int_to_strPtr, $_[0], Judy::Mem::String2Ptr( 
+$_[1] ) );
        return;
    }
    sub jGetInt { ## string to int
    ##    my( $str ) = @_;
        my( $intPtr, $int ) = Judy::SL::Get( $j_str_to_int, $_[0] );
        return $int;
    }
    sub jGetStr { ## int to str
    ##    my( $int ) = @_;
        my( $ignore, $strPtr ) = Judy::L::Get( $j_int_to_strPtr, $_[0]
+ );
        return Judy::Mem::Ptr2String( $strPtr );
    }
    sub jFree {
        {
            my ( undef, $value , $key ) = Judy::L::First( $j_int_to_st
+rPtr , 0 );
            while ( defined $key ) {
                ( undef, $value, $key ) = Judy::L::Next( $j_int_to_str
+Ptr , $key );
                defined $value  and Judy::Mem::Free( $value ); 
            }
        }
        Judy::SL::Free( $j_str_to_int );
        Judy::L::Free( $j_int_to_strPtr );
    }
}

[download]

In reply to Re^5: Bidirectional lookup algorithm? (Judy) by Anonymous Monk
in thread Bidirectional lookup algorithm? (Updated: further info.) by BrowserUk

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