Here is the code to encache/decache. I'm not sure what the problem could be, unless I shouldn't be lexically scoping the rows or using A10 instead of something else in the pack/unpack. 
sub to_cache {

    my $ticker = shift;
    my $data = shift;

    my @list;

    foreach(@$data) {
        push @list, pack("A10FFFFL", @$_);
    }

    $data_cache{$ticker} = \@list;
}

sub from_cache {

    my $ticker = shift;
    my $data = $data_cache{$ticker};
    my @rval;

    foreach (@$data) {
       my @row = unpack("A10FFFFL", $_);
       push @rval, \@row;
    }

    return \@rval;
}

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In reply to Re^4: bit by overhead by Anonymous Monk
in thread bit by overhead by Anonymous Monk

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