/[webpac]/trunk2/lib/WebPAC.pm
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revision 373 by dpavlin, Sun Jun 20 15:49:09 2004 UTC revision 441 by dpavlin, Tue Sep 14 17:07:59 2004 UTC
# Line 9  use Config::IniFiles; Line 9  use Config::IniFiles;
9  use XML::Simple;  use XML::Simple;
10  use Template;  use Template;
11  use Log::Log4perl qw(get_logger :levels);  use Log::Log4perl qw(get_logger :levels);
12    use Time::HiRes qw(time);
13    
14  use Data::Dumper;  use Data::Dumper;
15    
# Line 29  This module implements methods used by W Line 30  This module implements methods used by W
30    
31  =head2 new  =head2 new
32    
33  This will create new instance of WebPAC using configuration specified by C<config_file>.  Create new instance of WebPAC using configuration specified by C<config_file>.
34    
35   my $webpac = new WebPAC(   my $webpac = new WebPAC(
36          config_file => 'name.conf',          config_file => 'name.conf',
37          [code_page => 'ISO-8859-2',]          code_page => 'ISO-8859-2',
38            low_mem => 1,
39   );   );
40    
41  Default C<code_page> is C<ISO-8859-2>.  Default C<code_page> is C<ISO-8859-2>.
42    
43  It will also read configuration files  Default is not to use C<low_mem> options (see L<MEMORY USAGE> below).
44    
45    This method will also read configuration files
46  C<global.conf> (used by indexer and Web font-end)  C<global.conf> (used by indexer and Web font-end)
47  and configuration file specified by C<config_file>  and configuration file specified by C<config_file>
48  which describes databases to be indexed.  which describes databases to be indexed.
# Line 59  sub new { Line 63  sub new {
63          my $self = {@_};          my $self = {@_};
64          bless($self, $class);          bless($self, $class);
65    
66            $self->{'start_t'} = time();
67    
68          my $log_file = $self->{'log'} || "log.conf";          my $log_file = $self->{'log'} || "log.conf";
69          Log::Log4perl->init($log_file);          Log::Log4perl->init($log_file);
70    
# Line 106  sub new { Line 112  sub new {
112                  EVAL_PERL => 1,                  EVAL_PERL => 1,
113          );          );
114    
115            # running with low_mem flag? well, use DBM::Deep then.
116            if ($self->{'low_mem'}) {
117                    $log->info("running with low_mem which impacts performance (<32 Mb memory usage)");
118    
119                    my $db_file = "data.db";
120    
121                    if (-e $db_file) {
122                            unlink $db_file or $log->logdie("can't remove '$db_file' from last run");
123                            $log->debug("removed '$db_file' from last run");
124                    }
125    
126                    require DBM::Deep;
127    
128                    my $db = new DBM::Deep $db_file;
129    
130                    $log->logdie("DBM::Deep error: $!") unless ($db);
131    
132                    if ($db->error()) {
133                            $log->logdie("can't open '$db_file' under low_mem: ",$db->error());
134                    } else {
135                            $log->debug("using file '$db_file' for DBM::Deep");
136                    }
137    
138                    $self->{'db'} = $db;
139            }
140    
141          return $self;          return $self;
142  }  }
143    
# Line 116  Open CDS/ISIS database using OpenIsis mo Line 148  Open CDS/ISIS database using OpenIsis mo
148   $webpac->open_isis(   $webpac->open_isis(
149          filename => '/data/ISIS/ISIS',          filename => '/data/ISIS/ISIS',
150          code_page => '852',          code_page => '852',
151          limit_mfn => '500',          limit_mfn => 500,
152            start_mfn => 6000,
153          lookup => [ ... ],          lookup => [ ... ],
154   );   );
155    
156  By default, ISIS code page is assumed to be C<852>.  By default, ISIS code page is assumed to be C<852>.
157    
158    If optional parametar C<start_mfn> is set, this will be first MFN to read
159    from database (so you can skip beginning of your database if you need to).
160    
161  If optional parametar C<limit_mfn> is set, it will read just 500 records  If optional parametar C<limit_mfn> is set, it will read just 500 records
162  from database in example above.  from database in example above.
163    
# Line 149  sub open_isis { Line 185  sub open_isis {
185          $log->logcroak("need filename") if (! $arg->{'filename'});          $log->logcroak("need filename") if (! $arg->{'filename'});
186          my $code_page = $arg->{'code_page'} || '852';          my $code_page = $arg->{'code_page'} || '852';
187    
188            $log->logdie("can't find database ",$arg->{'filename'}) unless (glob($arg->{'filename'}.'.*'));
189    
190            # store data in object
191            $self->{'isis_filename'} = $arg->{'filename'};
192            $self->{'isis_code_page'} = $code_page;
193    
194          use OpenIsis;          use OpenIsis;
195    
196          #$self->{'isis_code_page'} = $code_page;          #$self->{'isis_code_page'} = $code_page;
# Line 157  sub open_isis { Line 199  sub open_isis {
199          my $cp = Text::Iconv->new($code_page,$self->{'code_page'});          my $cp = Text::Iconv->new($code_page,$self->{'code_page'});
200    
201          $log->info("reading ISIS database '",$arg->{'filename'},"'");          $log->info("reading ISIS database '",$arg->{'filename'},"'");
202            $log->debug("isis code page: $code_page");
203    
204          my $isis_db = OpenIsis::open($arg->{'filename'});          my $isis_db = OpenIsis::open($arg->{'filename'});
205    
206          my $maxmfn = OpenIsis::maxRowid( $isis_db ) || 1;          my $maxmfn = OpenIsis::maxRowid( $isis_db ) || 1;
207            my $startmfn = 1;
208    
209          $maxmfn = $self->{limit_mfn} if ($self->{limit_mfn});          if (my $s = $self->{'start_mfn'}) {
210                    $log->info("skipping to MFN $s");
211                    $startmfn = $s;
212            }
213    
214            $maxmfn = $startmfn + $self->{limit_mfn} if ($self->{limit_mfn});
215    
216          $log->info("processing $maxmfn records...");          $log->info("processing ",($maxmfn-$startmfn)." records...");
217    
218          # read database          # read database
219          for (my $mfn = 1; $mfn <= $maxmfn; $mfn++) {          for (my $mfn = $startmfn; $mfn <= $maxmfn; $mfn++) {
220    
221    
222                    $log->debug("mfn: $mfn\n");
223    
224                    my $rec;
225    
226                  # read record                  # read record
227                  my $row = OpenIsis::read( $isis_db, $mfn );                  my $row = OpenIsis::read( $isis_db, $mfn );
# Line 186  sub open_isis { Line 240  sub open_isis {
240                                                  $val = $l;                                                  $val = $l;
241                                          }                                          }
242    
243                                          push @{$self->{'data'}->{$mfn}->{$k}}, $val;                                          push @{$rec->{$k}}, $val;
244                                  }                                  }
245                            } else {
246                                    push @{$rec->{'000'}}, $mfn;
247                          }                          }
248    
249                  }                  }
250    
251                    $log->confess("record $mfn empty?") unless ($rec);
252    
253                    # store
254                    if ($self->{'low_mem'}) {
255                            $self->{'db'}->put($mfn, $rec);
256                    } else {
257                            $self->{'data'}->{$mfn} = $rec;
258                    }
259    
260                  # create lookup                  # create lookup
                 my $rec = $self->{'data'}->{$mfn};  
261                  $self->create_lookup($rec, @{$arg->{'lookup'}});                  $self->create_lookup($rec, @{$arg->{'lookup'}});
262    
263                    $self->progress_bar($mfn,$maxmfn);
264    
265          }          }
266    
267          $self->{'current_mfn'} = 1;          $self->{'current_mfn'} = $startmfn;
268            $self->{'last_pcnt'} = 0;
269    
270            $log->debug("max mfn: $maxmfn");
271    
272          # store max mfn and return it.          # store max mfn and return it.
273          return $self->{'max_mfn'} = $maxmfn;          return $self->{'max_mfn'} = $maxmfn;
# Line 226  sub fetch_rec { Line 295  sub fetch_rec {
295                  return;                  return;
296          }          }
297    
298          return $self->{'data'}->{$mfn};          $self->progress_bar($mfn,$self->{'max_mfn'});
299    
300            if ($self->{'low_mem'}) {
301                    return $self->{'db'}->get($mfn);
302            } else {
303                    return $self->{'data'}->{$mfn};
304            }
305    }
306    
307    =head2 progress_bar
308    
309    Draw progress bar on STDERR.
310    
311     $webpac->progress_bar($current, $max);
312    
313    =cut
314    
315    sub progress_bar {
316            my $self = shift;
317    
318            my ($curr,$max) = @_;
319    
320            my $log = $self->_get_logger();
321    
322            $log->logconfess("no current value!") if (! $curr);
323            $log->logconfess("no maximum value!") if (! $max);
324    
325            if ($curr > $max) {
326                    $max = $curr;
327                    $log->debug("overflow to $curr");
328            }
329    
330            $self->{'last_pcnt'} ||= 1;
331    
332            my $p = int($curr * 100 / $max);
333    
334            # reset on re-run
335            if ($p < $self->{'last_pcnt'}) {
336                    $self->{'last_pcnt'} = $p;
337                    $self->{'last_t'} = time();
338                    $self->{'last_curr'} = 1;
339            }
340    
341            if ($p != $self->{'last_pcnt'}) {
342    
343                    my $last_curr = $self->{'last_curr'} || $curr;
344                    my $t = time();
345                    my $rate = ($curr - $last_curr) / (($t - $self->{'last_t'} || 1));
346                    my $eta = ($max-$curr) / ($rate || 1);
347                    printf STDERR ("%5d [%-38s] %-5d %0.1f/s %s\r",$curr,"=" x ($p/3)."$p%>", $max, $rate, $self->fmt_time($eta));
348                    $self->{'last_pcnt'} = $p;
349                    $self->{'last_t'} = time();
350                    $self->{'last_curr'} = $curr;
351            }
352            print STDERR "\n" if ($p == 100);
353    }
354    
355    =head2 fmt_time
356    
357    Format time (in seconds) for display.
358    
359     print $webpac->fmt_time(time());
360    
361    This method is called by L<progress_bar> to display remaining time.
362    
363    =cut
364    
365    sub fmt_time {
366            my $self = shift;
367    
368            my $t = shift || 0;
369            my $out = "";
370    
371            my ($ss,$mm,$hh) = gmtime($t);
372            $out .= "${hh}h" if ($hh);
373            $out .= sprintf("%02d:%02d", $mm,$ss);
374            $out .= "  " if ($hh == 0);
375            return $out;
376  }  }
377    
378  =head2 open_import_xml  =head2 open_import_xml
# Line 252  sub open_import_xml { Line 398  sub open_import_xml {
398    
399          $self->{'tag'} = $type2tag{$type_base};          $self->{'tag'} = $type2tag{$type_base};
400    
401          $log->debug("using type '",$self->{'type'},"' tag <",$self->{'tag'},">") if ($self->{'debug'});          $log->info("using type '",$self->{'type'},"' tag <",$self->{'tag'},">");
402    
403          my $f = "./import_xml/".$self->{'type'}.".xml";          my $f = "./import_xml/".$self->{'type'}.".xml";
404          $log->logconfess("import_xml file '$f' doesn't exist!") if (! -e "$f");          $log->logconfess("import_xml file '$f' doesn't exist!") if (! -e "$f");
405    
406          $log->debug("reading '$f'") if ($self->{'debug'});          $log->info("reading '$f'");
407    
408            $self->{'import_xml_file'} = $f;
409    
410          $self->{'import_xml'} = XMLin($f,          $self->{'import_xml'} = XMLin($f,
411                  ForceArray => [ $self->{'tag'}, 'config', 'format' ],                  ForceArray => [ $self->{'tag'}, 'config', 'format' ],
412          );          );
413    
414            $log->debug("import xml is ",sub { Dumper($self->{'import_xml'}) });
415    
416  }  }
417    
418  =head2 create_lookup  =head2 create_lookup
# Line 284  sub create_lookup { Line 434  sub create_lookup {
434          $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);          $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
435    
436          foreach my $i (@_) {          foreach my $i (@_) {
437                  if ($i->{'eval'}) {                  $log->logconfess("need key") unless defined($i->{'key'});
438                          my $eval = $self->fill_in($rec,$i->{'eval'});                  $log->logconfess("need val") unless defined($i->{'val'});
439                          my $key = $self->fill_in($rec,$i->{'key'});  
440                          my @val = $self->fill_in($rec,$i->{'val'});                  if (defined($i->{'eval'})) {
441                          if ($key && @val && eval $eval) {                          # eval first, so we can skip fill_in for key and val
442                            my $eval = $self->fill_in($rec,$i->{'eval'}) || next;
443                            if ($self->_eval($eval)) {
444                                    my $key = $self->fill_in($rec,$i->{'key'}) || next;
445                                    my @val = $self->fill_in($rec,$i->{'val'}) || next;
446                                  $log->debug("stored $key = ",sub { join(" | ",@val) });                                  $log->debug("stored $key = ",sub { join(" | ",@val) });
447                                  push @{$self->{'lookup'}->{$key}}, @val;                                  push @{$self->{'lookup'}->{$key}}, @val;
448                          }                          }
449                  } else {                  } else {
450                          my $key = $self->fill_in($rec,$i->{'key'});                          my $key = $self->fill_in($rec,$i->{'key'}) || next;
451                          my @val = $self->fill_in($rec,$i->{'val'});                          my @val = $self->fill_in($rec,$i->{'val'}) || next;
452                          if ($key && @val) {                          $log->debug("stored $key = ",sub { join(" | ",@val) });
453                                  $log->debug("stored $key = ",sub { join(" | ",@val) });                          push @{$self->{'lookup'}->{$key}}, @val;
                                 push @{$self->{'lookup'}->{$key}}, @val;  
                         }  
454                  }                  }
455          }          }
456  }  }
# Line 329  sub get_data { Line 481  sub get_data {
481    
482          if ($$rec->{$f}) {          if ($$rec->{$f}) {
483                  return '' if (! $$rec->{$f}->[$i]);                  return '' if (! $$rec->{$f}->[$i]);
484                    no strict 'refs';
485                  if ($sf && $$rec->{$f}->[$i]->{$sf}) {                  if ($sf && $$rec->{$f}->[$i]->{$sf}) {
486                          $$found++ if (defined($$found));                          $$found++ if (defined($$found));
487                          return $$rec->{$f}->[$i]->{$sf};                          return $$rec->{$f}->[$i]->{$sf};
# Line 369  Following example will read second value Line 522  Following example will read second value
522  This function B<does not> perform parsing of format to inteligenty skip  This function B<does not> perform parsing of format to inteligenty skip
523  delimiters before fields which aren't used.  delimiters before fields which aren't used.
524    
525    This method will automatically decode UTF-8 string to local code page
526    if needed.
527    
528  =cut  =cut
529    
530  sub fill_in {  sub fill_in {
# Line 384  sub fill_in { Line 540  sub fill_in {
540          # FIXME remove for speedup?          # FIXME remove for speedup?
541          $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);          $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
542    
543            if (utf8::is_utf8($format)) {
544                    $format = $self->_x($format);
545            }
546    
547          my $found = 0;          my $found = 0;
548    
549          my $eval_code;          my $eval_code;
# Line 481  sub parse { Line 641  sub parse {
641    
642          $i = 0 if (! $i);          $i = 0 if (! $i);
643    
644          my $format = $self->{'utf2cp'}->convert($format_utf8) || $log->logconfess("can't convert '$format_utf8' from UTF-8 to ",$self->{'code_page'});          my $format = $self->_x($format_utf8) || $log->logconfess("can't convert '$format_utf8' from UTF-8 to ",$self->{'code_page'});
645    
646          my @out;          my @out;
647    
# Line 594  sub fill_in_to_arr { Line 754  sub fill_in_to_arr {
754          return @arr;          return @arr;
755  }  }
756    
757    =head2 sort_arr
758    
759    Sort array ignoring case and html in data
760    
761     my @sorted = $webpac->sort_arr(@unsorted);
762    
763    =cut
764    
765    sub sort_arr {
766            my $self = shift;
767    
768            my $log = $self->_get_logger();
769    
770            # FIXME add Schwartzian Transformation?
771    
772            my @sorted = sort {
773                    $a =~ s#<[^>]+/*>##;
774                    $b =~ s#<[^>]+/*>##;
775                    lc($b) cmp lc($a)
776            } @_;
777            $log->debug("sorted values: ",sub { join(", ",@sorted) });
778    
779            return @sorted;
780    }
781    
782    
783  =head2 data_structure  =head2 data_structure
784    
# Line 602  It is used later to produce output. Line 787  It is used later to produce output.
787    
788   my @ds = $webpac->data_structure($rec);   my @ds = $webpac->data_structure($rec);
789    
790    This method will also set C<$webpac->{'currnet_filename'}> if there is
791    <filename> tag in C<import_xml> and C<$webpac->{'headline'}> if there is
792    <headline> tag.
793    
794  =cut  =cut
795    
796  sub data_structure {  sub data_structure {
# Line 612  sub data_structure { Line 801  sub data_structure {
801          my $rec = shift;          my $rec = shift;
802          $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);          $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);
803    
804            undef $self->{'currnet_filename'};
805            undef $self->{'headline'};
806    
807          my @sorted_tags;          my @sorted_tags;
808          if ($self->{tags_by_order}) {          if ($self->{tags_by_order}) {
809                  @sorted_tags = @{$self->{tags_by_order}};                  @sorted_tags = @{$self->{tags_by_order}};
# Line 643  sub data_structure { Line 835  sub data_structure {
835                          }                          }
836                          next if (! @v);                          next if (! @v);
837    
838                          # does tag have type?                          if ($tag->{'sort'}) {
839                          if ($tag->{'type'}) {                                  @v = $self->sort_arr(@v);
840                                  push @{$row->{$tag->{'type'}}}, @v;                                  $log->warn("sort within tag is usually not what you want!");
841                          } else {                          }
842                                  push @{$row->{'display'}}, @v;  
843                                  push @{$row->{'swish'}}, @v;                          # use format?
844                            if ($tag->{'format_name'}) {
845                                    @v = map { $self->apply_format($tag->{'format_name'},$tag->{'format_delimiter'},$_) } @v;
846                          }                          }
847    
848                            if ($field eq 'filename') {
849                                    $self->{'current_filename'} = join('',@v);
850                                    $log->debug("filename: ",$self->{'current_filename'});
851                            } elsif ($field eq 'headline') {
852                                    $self->{'headline'} .= join('',@v);
853                                    $log->debug("headline: ",$self->{'headline'});
854                                    next; # don't return headline in data_structure!
855                            }
856    
857                            # delimiter will join repeatable fields
858                            if ($tag->{'delimiter'}) {
859                                    @v = ( join($tag->{'delimiter'}, @v) );
860                            }
861    
862                            # default types
863                            my @types = qw(display swish);
864                            # override by type attribute
865                            @types = ( $tag->{'type'} ) if ($tag->{'type'});
866    
867                            foreach my $type (@types) {
868                                    # append to previous line?
869                                    $log->debug("type: $type ",sub { join(" ",@v) }, $row->{'append'} || 'no append');
870                                    if ($tag->{'append'}) {
871    
872                                            # I will delimit appended part with
873                                            # delimiter (or ,)
874                                            my $d = $tag->{'delimiter'};
875                                            # default delimiter
876                                            $d ||= ", ";
877    
878                                            my $last = pop @{$row->{$type}};
879                                            $d = "" if (! $last);
880                                            $last .= $d . join($d, @v);
881                                            push @{$row->{$type}}, $last;
882    
883                                    } else {
884                                            push @{$row->{$type}}, @v;
885                                    }
886                            }
887    
888    
889                  }                  }
890    
891                  if ($row) {                  if ($row) {
892                          $row->{'tag'} = $field;                          $row->{'tag'} = $field;
893    
894                            # TODO: name_sigular, name_plural
895                            my $name = $self->{'import_xml'}->{'indexer'}->{$field}->{'name'};
896                            $row->{'name'} = $name ? $self->_x($name) : $field;
897    
898                            # post-sort all values in field
899                            if ($self->{'import_xml'}->{'indexer'}->{$field}->{'sort'}) {
900                                    $log->warn("sort at field tag not implemented");
901                            }
902    
903                          push @ds, $row;                          push @ds, $row;
904    
905                          $log->debug("row $field: ",sub { Dumper($row) });                          $log->debug("row $field: ",sub { Dumper($row) });
906                  }                  }
907    
# Line 694  sub output { Line 940  sub output {
940          return $out;          return $out;
941  }  }
942    
943    =head2 output_file
944    
945    Create output from in-memory data structure using Template Toolkit template
946    to a file.
947    
948     $webpac->output_file(
949            file => 'out.txt',
950            template => 'text.tt',
951            data => @ds
952     );
953    
954    =cut
955    
956    sub output_file {
957            my $self = shift;
958    
959            my $args = {@_};
960    
961            my $log = $self->_get_logger();
962    
963            my $file = $args->{'file'} || $log->logconfess("need file name");
964    
965            $log->debug("creating file ",$file);
966    
967            open(my $fh, ">", $file) || $log->logdie("can't open output file '$file': $!");
968            print $fh $self->output(
969                    template => $args->{'template'},
970                    data => $args->{'data'},
971            ) || $log->logdie("print: $!");
972            close($fh) || $log->logdie("close: $!");
973    }
974    
975    =head2 apply_format
976    
977    Apply format specified in tag with C<format_name="name"> and
978    C<format_delimiter=";;">.
979    
980     my $text = $webpac->apply_format($format_name,$format_delimiter,$data);
981    
982    Formats can contain C<lookup{...}> if you need them.
983    
984    =cut
985    
986    sub apply_format {
987            my $self = shift;
988    
989            my ($name,$delimiter,$data) = @_;
990    
991            my $log = $self->_get_logger();
992    
993            if (! $self->{'import_xml'}->{'format'}->{$name}) {
994                    $log->warn("<format name=\"$name\"> is not defined in ",$self->{'import_xml_file'});
995                    return $data;
996            }
997    
998            $log->warn("no delimiter for format $name") if (! $delimiter);
999    
1000            my $format = $self->_x($self->{'import_xml'}->{'format'}->{$name}->{'content'}) || $log->logdie("can't find format '$name'");
1001    
1002            my @data = split(/\Q$delimiter\E/, $data);
1003    
1004            my $out = sprintf($format, @data);
1005            $log->debug("using format $name [$format] on $data to produce: $out");
1006    
1007            if ($out =~ m/$LOOKUP_REGEX/o) {
1008                    return $self->lookup($out);
1009            } else {
1010                    return $out;
1011            }
1012    
1013    }
1014    
1015    
1016  #  #
1017  #  #
1018  #  #
# Line 746  sub _sort_by_order { Line 1065  sub _sort_by_order {
1065          return $va <=> $vb;          return $va <=> $vb;
1066  }  }
1067    
1068    =head2 _get_logger
1069    
1070    Get C<Log::Log4perl> object with a twist: domains are defined for each
1071    method
1072    
1073     my $log = $webpac->_get_logger();
1074    
1075    =cut
1076    
1077  sub _get_logger {  sub _get_logger {
1078          my $self = shift;          my $self = shift;
1079    
1080          my @c = caller(1);          my $name = (caller(1))[3] || caller;
1081          return get_logger($c[3]);          return get_logger($name);
1082    }
1083    
1084    =head2 _x
1085    
1086    Convert string from UTF-8 to code page defined in C<import_xml>.
1087    
1088     my $text = $webpac->_x('utf8 text');
1089    
1090    =cut
1091    
1092    sub _x {
1093            my $self = shift;
1094            my $utf8 = shift || return;
1095    
1096            return $self->{'utf2cp'}->convert($utf8) ||
1097                    $self->_get_logger()->logwarn("can't convert '$utf8'");
1098  }  }
1099    
1100  #  #
# Line 771  B<This is different from normal Log4perl Line 1115  B<This is different from normal Log4perl
1115  also use method names, and not only classes (which are just few)  also use method names, and not only classes (which are just few)
1116  to filter logging.  to filter logging.
1117    
1118    
1119    =head1 MEMORY USAGE
1120    
1121    C<low_mem> options is double-edged sword. If enabled, WebPAC
1122    will run on memory constraint machines (which doesn't have enough
1123    physical RAM to create memory structure for whole source database).
1124    
1125    If your machine has 512Mb or more of RAM and database is around 10000 records,
1126    memory shouldn't be an issue. If you don't have enough physical RAM, you
1127    might consider using virtual memory (if your operating system is handling it
1128    well, like on FreeBSD or Linux) instead of dropping to L<DBD::Deep> to handle
1129    parsed structure of ISIS database (this is what C<low_mem> option does).
1130    
1131    Hitting swap at end of reading source database is probably o.k. However,
1132    hitting swap before 90% will dramatically decrease performance and you will
1133    be better off with C<low_mem> and using rest of availble memory for
1134    operating system disk cache (Linux is particuallary good about this).
1135    However, every access to database record will require disk access, so
1136    generation phase will be slower 10-100 times.
1137    
1138    Parsed structures are essential - you just have option to trade RAM memory
1139    (which is fast) for disk space (which is slow). Be sure to have planty of
1140    disk space if you are using C<low_mem> and thus L<DBD::Deep>.
1141    
1142    However, when WebPAC is running on desktop machines (or laptops :-), it's
1143    highly undesireable for system to start swapping. Using C<low_mem> option can
1144    reduce WecPAC memory usage to around 64Mb for same database with lookup
1145    fields and sorted indexes which stay in RAM. Performance will suffer, but
1146    memory usage will really be minimal. It might be also more confortable to
1147    run WebPAC reniced on those machines.
1148    
1149  =cut  =cut
1150    
1151  1;  1;
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