maps/perl/map-prefetch.ext

#! perl

# this plug-in prefetches maps. everytime a player enters a map,
# it will asynchronously prefetch files from disk (it will not load them
# into the server, but into the OS cache only).

if (0) { #test#
use Errno ();
use Time::HiRes;
use Fcntl;
use IO::AIO;

Event->io (fd   => IO::AIO::poll_fileno,
           poll => 'r',
           cb   => \&IO::AIO::poll_cb);

# find all potential exit paths, this is slow, so this info is cached
sub find_exits {
   my ($map) = @_;

   my %exit;

   # normal exits
   for my $x (0 .. $map->width - 1) {
      for my $y (0 .. $map->height - 1) {
         for (grep $_->type == 66, $map->at ($x, $y)) {
            my $path = $_->slaying;

            next if 3 > length $path;

            # TODO: improve unique exit detection etc.
            $exit{cf::maps_directory cf::path_combine_and_normalize $map->path, $path}++;
         }
      }
   }

   # tiled maps
   for (0..3) {
      my $path = $map->tile_path ($_)
         or next;

      $exit{cf::maps_directory cf::path_combine_and_normalize $map->path, $path}++;
   }

   [keys %exit]
}

my $PREFETCHING;
my @PREFETCH;
my %FILE_TIMEOUT;

sub _prefetch;

my $empty_cb = sub { };

sub load_file {
   my ($path, $cb) = @_;

   my $NOW = Time::HiRes::time;

   aio_open $path, O_RDONLY, 0, sub {
      my $fh = shift
        or return $cb->(), _prefetch;

      aio_readahead $fh, 0, -s $fh, sub {
         my $time = Time::HiRes::time - $NOW;
         warn "LONG PREFETCH $path $time\n" if $time > 0.3;

         $cb->(), _prefetch;
      };
   };
}

sub prefetch($$;$) {
   my ($type, $path, $cb) = @_;

   push @PREFETCH, [$type, $path, $cb || $empty_cb];
   _prefetch unless $PREFETCHING;
}

sub _prefetch {
   $PREFETCHING = 1;

   while (@PREFETCH) {
      my ($type, $path, $cb) = @{ shift @PREFETCH };

      my $NOW = Time::HiRes::time;
      $cb->(), next if $FILE_TIMEOUT{$path} > $NOW;
      $FILE_TIMEOUT{$path} = $NOW + 60 + rand 60;

      if ($type eq "map") {
         if (my $map = cf::map::has_been_loaded $path) {
            $cb->(), next if $map->in_memory == cf::MAP_IN_MEMORY;

            prefetch file => $map->tmpname
               if $map->in_memory == cf::MAP_SWAPPED;
         }
      }

      load_file $path, $cb;
      return;
   }

   $PREFETCHING = 0;
}

my %MAP_EXITS;

sub prefetch_map($) {
   my ($map) = @_;

   my $exit = $MAP_EXITS{$map->path} ||= find_exits $map;
   prefetch map => $_ for @$exit;
}

sub on_mapenter {
   my ($ob) = @_;

   prefetch_map $ob->map;
}

# prefetch a few players/second
{
   my @players;

   Event->timer (interval => 0.2, cb => sub {
      @players = map $_->ob->name, cf::player::list unless @players;
      my $player = cf::player::find pop @players
         or return;

      if (my $map = $player->ob->map) {
         prefetch_map $map;
      }

      prefetch map => +($player->get_savebed)[0];
   });
}

# prefetch all .pl files every few minutes (thats only a "few" megabytes)
Event->timer (after => 1, interval => 600, cb => sub {
   my $playerdir = cf::localdir . "/" . cf::playerdir;

   aio_readdir $playerdir, sub {
      my ($players) = @_;
      my $prefetch; $prefetch = sub {
         my $player = pop @$players
            or return;

         load_file "$playerdir/$player/$player.pl", $prefetch;
      };

      $prefetch->(); $prefetch->();
   };
});
}


Revision:	1.9
Committed:	Wed Aug 2 11:17:08 2006 UTC (17 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.8:	+2 -0 lines
Log Message:	add mlab monsterstyles as sent by sliss
#	User	Rev	Content
1	root	1.1	#! perl
2
3			# this plug-in prefetches maps. everytime a player enters a map,
4			# it will asynchronously prefetch files from disk (it will not load them
5			# into the server, but into the OS cache only).
6
7	root	1.9	if (0) { #test#
8	root	1.1	use Errno ();
9			use Time::HiRes;
10			use Fcntl;
11			use IO::AIO;
12
13	root	1.6	Event->io (fd => IO::AIO::poll_fileno,
14			poll => 'r',
15			cb => \&IO::AIO::poll_cb);
16
17	root	1.2	# find all potential exit paths, this is slow, so this info is cached
18	root	1.1	sub find_exits {
19			my ($map) = @_;
20
21			my %exit;
22
23	root	1.6	# normal exits
24	root	1.1	for my $x (0 .. $map->width - 1) {
25			for my $y (0 .. $map->height - 1) {
26			for (grep $_->type == 66, $map->at ($x, $y)) {
27			my $path = $_->slaying;
28
29			next if 3 > length $path;
30
31	root	1.6	# TODO: improve unique exit detection etc.
32			$exit{cf::maps_directory cf::path_combine_and_normalize $map->path, $path}++;
33	root	1.1	}
34			}
35			}
36
37	root	1.6	# tiled maps
38			for (0..3) {
39			my $path = $map->tile_path ($_)
40			or next;
41
42			$exit{cf::maps_directory cf::path_combine_and_normalize $map->path, $path}++;
43			}
44
45	root	1.1	[keys %exit]
46			}
47
48	root	1.6	my $PREFETCHING;
49	root	1.5	my @PREFETCH;
50	root	1.6	my %FILE_TIMEOUT;
51	root	1.1
52	root	1.6	sub _prefetch;
53	root	1.1
54	root	1.6	my $empty_cb = sub { };
55	root	1.1
56	root	1.6	sub load_file {
57			my ($path, $cb) = @_;
58	root	1.1
59	root	1.6	my $NOW = Time::HiRes::time;
60	root	1.1
61	root	1.6	aio_open $path, O_RDONLY, 0, sub {
62			my $fh = shift
63			or return $cb->(), _prefetch;
64	root	1.1
65	root	1.6	aio_readahead $fh, 0, -s $fh, sub {
66			my $time = Time::HiRes::time - $NOW;
67			warn "LONG PREFETCH $path $time\n" if $time > 0.3;
68	root	1.5
69	root	1.6	$cb->(), _prefetch;
70	root	1.1	};
71	root	1.6	};
72			}
73
74			sub prefetch($$;$) {
75			my ($type, $path, $cb) = @_;
76
77			push @PREFETCH, [$type, $path, $cb \|\| $empty_cb];
78			_prefetch unless $PREFETCHING;
79			}
80
81			sub _prefetch {
82			$PREFETCHING = 1;
83
84			while (@PREFETCH) {
85			my ($type, $path, $cb) = @{ shift @PREFETCH };
86
87			my $NOW = Time::HiRes::time;
88			$cb->(), next if $FILE_TIMEOUT{$path} > $NOW;
89			$FILE_TIMEOUT{$path} = $NOW + 60 + rand 60;
90	root	1.5
91	root	1.6	if ($type eq "map") {
92			if (my $map = cf::map::has_been_loaded $path) {
93			$cb->(), next if $map->in_memory == cf::MAP_IN_MEMORY;
94
95	root	1.8	prefetch file => $map->tmpname
96	root	1.6	if $map->in_memory == cf::MAP_SWAPPED;
97			}
98			}
99
100			load_file $path, $cb;
101			return;
102	root	1.1	}
103	root	1.6
104			$PREFETCHING = 0;
105	root	1.1	}
106
107	root	1.5	my %MAP_EXITS;
108
109	root	1.7	sub prefetch_map($) {
110	root	1.6	my ($map) = @_;
111
112			my $exit = $MAP_EXITS{$map->path} \|\|= find_exits $map;
113			prefetch map => $_ for @$exit;
114			}
115
116	root	1.5	sub on_mapenter {
117			my ($ob) = @_;
118
119	root	1.6	prefetch_map $ob->map;
120			}
121	root	1.5
122	root	1.6	# prefetch a few players/second
123			{
124			my @players;
125
126			Event->timer (interval => 0.2, cb => sub {
127			@players = map $_->ob->name, cf::player::list unless @players;
128			my $player = cf::player::find pop @players
129			or return;
130
131	root	1.7	if (my $map = $player->ob->map) {
132			prefetch_map $map;
133			}
134
135	root	1.6	prefetch map => +($player->get_savebed)[0];
136			});
137	root	1.5	}
138
139	root	1.6	# prefetch all .pl files every few minutes (thats only a "few" megabytes)
140			Event->timer (after => 1, interval => 600, cb => sub {
141			my $playerdir = cf::localdir . "/" . cf::playerdir;
142
143			aio_readdir $playerdir, sub {
144			my ($players) = @_;
145			my $prefetch; $prefetch = sub {
146			my $player = pop @$players
147			or return;
148
149			load_file "$playerdir/$player/$player.pl", $prefetch;
150			};
151
152			$prefetch->(); $prefetch->();
153			};
154			});
155	root	1.9	}
156	root	1.6
157	root	1.1
158