server/ext/map-scheduler.ext

#! perl # MANDATORY

# this extension swaps out maps and resets them, in essence managing
# the reset/swap policy of the server.
# it also contains the map prefetching logic

#our $DEACTIVATE_TIMEOUT =   20; # number of seconds after which maps get deactivated to save cpu
our $SWAP_TIMEOUT       =   35; # number of seconds after which maps inactive get swapped out
our $SCHEDULE_INTERVAL  =    2; # time the map scheduler sleeps between runs
our $SAVE_TIMEOUT       =   20; # save maps every n seconds

cf::async_ext {
   $Coro::current->prio (Coro::PRIO_MIN);
   # load the header of swapped-out maps.
   # this is not a correctness issue, it simply saves diskspace
   # because old files will get cleaned up on reset time
   Coro::Timer::sleep 1;

   my $files = Coro::AIO::aio_readdir cf::localdir . "/" . cf::tmpdir;

   for my $map (@$files) {
      utf8::decode $map;
      next if $map =~ /\.(?:pst|meta)$/;
      $map =~ s/∕/\//g;
      $map =~ s/\.map$//;
      cf::map::find $map;
      $cf::WAIT_FOR_TICK_ONE->wait;
   }

   #TODO: should also preload random maps...
};

our $SCHEDULER = cf::async_ext {
   my $schedule_interval = Coro::Event->timer (after => 1, interval => $SCHEDULE_INTERVAL);
   while () {
      $schedule_interval->next;

      # this weird form of iteration over values is used because
      # the hash changes underneath us frequently, and for
      # keeps a direct reference to the value without (in 5.8 perls)
      # keeping a reference, so this is prone to crashes or worse.
      my @maps = keys %cf::MAP;
      for (@maps) {
         my $map = $cf::MAP{$_}
            or next;
         $map->valid or next;

         eval {
            # not yet, because maps might become visible to players nearby
            # we need to remove the map from %cf::MAP and all tiled map links
#         if ($last_access + $DEACTIVATE_TIMEOUT <= $cf::RUNTIME) {
#            $map->deactivate;
#            delete $map->{active};
#         }
            if ($map->should_reset) {
               $map->reset;
            } elsif ($map->in_memory == cf::MAP_IN_MEMORY) {
               if ($map->last_access + $SWAP_TIMEOUT <= $cf::RUNTIME && !$map->players) {
                  $cf::WAIT_FOR_TICK_ONE->wait;
                  $map->swap_out;
               } elsif ($map->{last_save} + $SAVE_TIMEOUT <= $cf::RUNTIME) {
                  $cf::WAIT_FOR_TICK_ONE->wait;
                  $map->save;
               }
            }
         };
         warn $@ if $@;
         Coro::cede;
      };
   }
};

$SCHEDULER->prio (-2);

Revision:	1.24
Committed:	Mon Jan 22 03:44:41 2007 UTC (17 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.23:	+3 -2 lines
Log Message:	there is a weird bug in Event or perl or... add some wrokarounds
#	User	Rev	Content
1	root	1.22	#! perl # MANDATORY
2	root	1.1
3			# this extension swaps out maps and resets them, in essence managing
4			# the reset/swap policy of the server.
5	root	1.18	# it also contains the map prefetching logic
6	root	1.1
7	root	1.24	#our $DEACTIVATE_TIMEOUT = 20; # number of seconds after which maps get deactivated to save cpu
8	root	1.10	our $SWAP_TIMEOUT = 35; # number of seconds after which maps inactive get swapped out
9	root	1.7	our $SCHEDULE_INTERVAL = 2; # time the map scheduler sleeps between runs
10	root	1.10	our $SAVE_TIMEOUT = 20; # save maps every n seconds
11	root	1.1
12	root	1.17	cf::async_ext {
13	root	1.12	$Coro::current->prio (Coro::PRIO_MIN);
14	root	1.14	# load the header of swapped-out maps.
15	root	1.12	# this is not a correctness issue, it simply saves diskspace
16			# because old files will get cleaned up on reset time
17	root	1.16	Coro::Timer::sleep 1;
18	root	1.12
19			my $files = Coro::AIO::aio_readdir cf::localdir . "/" . cf::tmpdir;
20
21			for my $map (@$files) {
22			utf8::decode $map;
23			next if $map =~ /\.(?:pst\|meta)$/;
24			$map =~ s/∕/\//g;
25	root	1.23	$map =~ s/\.map$//;
26	root	1.12	cf::map::find $map;
27	root	1.21	$cf::WAIT_FOR_TICK_ONE->wait;
28	root	1.12	}
29
30			#TODO: should also preload random maps...
31			};
32
33	root	1.17	our $SCHEDULER = cf::async_ext {
34	root	1.24	my $schedule_interval = Coro::Event->timer (after => 1, interval => $SCHEDULE_INTERVAL);
35	root	1.1	while () {
36	root	1.24	$schedule_interval->next;
37	root	1.1
38	root	1.9	# this weird form of iteration over values is used because
39			# the hash changes underneath us frequently, and for
40			# keeps a direct reference to the value without (in 5.8 perls)
41			# keeping a reference, so this is prone to crashes or worse.
42	root	1.8	my @maps = keys %cf::MAP;
43			for (@maps) {
44			my $map = $cf::MAP{$_}
45			or next;
46			$map->valid or next;
47	root	1.9
48	root	1.1	eval {
49			# not yet, because maps might become visible to players nearby
50	root	1.3	# we need to remove the map from %cf::MAP and all tiled map links
51	root	1.1	# if ($last_access + $DEACTIVATE_TIMEOUT <= $cf::RUNTIME) {
52			# $map->deactivate;
53			# delete $map->{active};
54			# }
55			if ($map->should_reset) {
56			$map->reset;
57	root	1.3	} elsif ($map->in_memory == cf::MAP_IN_MEMORY) {
58	root	1.6	if ($map->last_access + $SWAP_TIMEOUT <= $cf::RUNTIME && !$map->players) {
59	root	1.20	$cf::WAIT_FOR_TICK_ONE->wait;
60	root	1.3	$map->swap_out;
61			} elsif ($map->{last_save} + $SAVE_TIMEOUT <= $cf::RUNTIME) {
62	root	1.20	$cf::WAIT_FOR_TICK_ONE->wait;
63	root	1.3	$map->save;
64			}
65	root	1.1	}
66			};
67			warn $@ if $@;
68			Coro::cede;
69	root	1.8	};
70	root	1.1	}
71			};
72	root	1.5
73	root	1.1	$SCHEDULER->prio (-2);
74