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       = $cf::CFG{swap_timeout}      || 300; # number of seconds after which inactive maps get swapped out
our $SCHEDULE_INTERVAL  = $cf::CFG{schedule_interval} ||  .8; # time the map scheduler sleeps between runs
our $SAVE_TIMEOUT       = $cf::CFG{save_timeout}      ||  30; # save maps every n seconds
our $SWAP_LOAD1         = $cf::CFG{swap_load1}        ||  .1; # start aggressively swapping at this load
our $SWAP_LOAD2         = $cf::CFG{swap_load2}        ||  .4; # swap as fast as possible at this load

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 0.25;

   for my $path (@{ cf::map::tmp_maps or [] }, @{ cf::map::random_maps or [] }) {
      cf::map::find $path;
      cf::wait_for_tick; Coro::cede;
   }

   # now hunt for resettable per-player maps
   for my $login (@{ cf::player::list_logins or [] }) {
      for my $path (@{ cf::player::maps $login or [] }) {
         Coro::cede;

         $path =~ /^~[^\/]+(\/.*)$/
            or next; # doh

         my $base = cf::map::find $1;

         # skip maps without base maps on the assumption
         # that those are old, unresettable maps
         next unless $base;

         # skip unresettable maps, for speed
         next if $base->{deny_reset};

         my $map = cf::map::find $path;
         cf::wait_for_tick;

         if ($map->{deny_reset}) {
            warn "found noreset map with resettable base map, resetting: $path\n";
            delete $map->{deny_reset};
         }
      }
   }
};

our $SCHEDULER = cf::async_ext {
   while () {
      Coro::Event::do_timer (after => $SCHEDULE_INTERVAL)
         unless $cf::LOADAVG > $SWAP_LOAD2;

      # 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) {
               my $max_idle = cf::clamp +(cf::lerp $cf::LOADAVG, $SWAP_LOAD1, $SWAP_LOAD2, $SWAP_TIMEOUT, 0), 0, $SWAP_TIMEOUT;

               if ($map->last_access + $max_idle <= $cf::RUNTIME && !$map->players) {
                  $map->swap_out;
                  cf::wait_for_tick unless $cf::LOADAVG > $SWAP_LOAD2;
               } elsif ($map->{last_save} + $SAVE_TIMEOUT <= $cf::RUNTIME) {
                  $map->save;
                  cf::wait_for_tick unless $cf::LOADAVG > $SWAP_LOAD2;
               }
            }
         };
         warn $@ if $@;
         cf::cede_to_tick;
      };
   }
};

$SCHEDULER->prio (-2);

Revision:	1.37
Committed:	Mon Jun 11 21:38:13 2007 UTC (16 years, 11 months ago) by root
Branch:	MAIN
Changes since 1.36:	+1 -1 lines
Log Message:	port micropather to c++...
#	User	Rev	Content
1	root	1.37	#! 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	1.34	our $SWAP_TIMEOUT = $cf::CFG{swap_timeout} \|\| 300; # number of seconds after which inactive maps get swapped out
9			our $SCHEDULE_INTERVAL = $cf::CFG{schedule_interval} \|\| .8; # time the map scheduler sleeps between runs
10			our $SAVE_TIMEOUT = $cf::CFG{save_timeout} \|\| 30; # save maps every n seconds
11			our $SWAP_LOAD1 = $cf::CFG{swap_load1} \|\| .1; # start aggressively swapping at this load
12			our $SWAP_LOAD2 = $cf::CFG{swap_load2} \|\| .4; # swap as fast as possible at this load
13	root	1.1
14	root	1.17	cf::async_ext {
15	root	1.12	$Coro::current->prio (Coro::PRIO_MIN);
16	root	1.35
17	root	1.14	# load the header of swapped-out maps.
18	root	1.12	# this is not a correctness issue, it simply saves diskspace
19			# because old files will get cleaned up on reset time
20	root	1.35	Coro::Timer::sleep 0.25;
21	root	1.12
22	root	1.36	for my $path (@{ cf::map::tmp_maps or [] }, @{ cf::map::random_maps or [] }) {
23			cf::map::find $path;
24	root	1.35	cf::wait_for_tick; Coro::cede;
25	root	1.12	}
26
27	root	1.35	# now hunt for resettable per-player maps
28			for my $login (@{ cf::player::list_logins or [] }) {
29			for my $path (@{ cf::player::maps $login or [] }) {
30			Coro::cede;
31
32			$path =~ /^~[^\/]+(\/.*)$/
33			or next; # doh
34
35			my $base = cf::map::find $1;
36
37			# skip maps without base maps on the assumption
38			# that those are old, unresettable maps
39			next unless $base;
40
41			# skip unresettable maps, for speed
42			next if $base->{deny_reset};
43
44			my $map = cf::map::find $path;
45			cf::wait_for_tick;
46
47			if ($map->{deny_reset}) {
48			warn "found noreset map with resettable base map, resetting: $path\n";
49			delete $map->{deny_reset};
50			}
51			}
52			}
53	root	1.12	};
54
55	root	1.17	our $SCHEDULER = cf::async_ext {
56	root	1.1	while () {
57	root	1.34	Coro::Event::do_timer (after => $SCHEDULE_INTERVAL)
58			unless $cf::LOADAVG > $SWAP_LOAD2;
59	root	1.1
60	root	1.9	# this weird form of iteration over values is used because
61			# the hash changes underneath us frequently, and for
62			# keeps a direct reference to the value without (in 5.8 perls)
63			# keeping a reference, so this is prone to crashes or worse.
64	root	1.8	my @maps = keys %cf::MAP;
65			for (@maps) {
66			my $map = $cf::MAP{$_}
67			or next;
68			$map->valid or next;
69	root	1.9
70	root	1.1	eval {
71			# not yet, because maps might become visible to players nearby
72	root	1.3	# we need to remove the map from %cf::MAP and all tiled map links
73	root	1.1	# if ($last_access + $DEACTIVATE_TIMEOUT <= $cf::RUNTIME) {
74			# $map->deactivate;
75			# delete $map->{active};
76			# }
77			if ($map->should_reset) {
78			$map->reset;
79	root	1.3	} elsif ($map->in_memory == cf::MAP_IN_MEMORY) {
80	root	1.34	my $max_idle = cf::clamp +(cf::lerp $cf::LOADAVG, $SWAP_LOAD1, $SWAP_LOAD2, $SWAP_TIMEOUT, 0), 0, $SWAP_TIMEOUT;
81
82	root	1.26	if ($map->last_access + $max_idle <= $cf::RUNTIME && !$map->players) {
83	root	1.25	$map->swap_out;
84	root	1.34	cf::wait_for_tick unless $cf::LOADAVG > $SWAP_LOAD2;
85	root	1.3	} elsif ($map->{last_save} + $SAVE_TIMEOUT <= $cf::RUNTIME) {
86	root	1.25	$map->save;
87	root	1.34	cf::wait_for_tick unless $cf::LOADAVG > $SWAP_LOAD2;
88	root	1.3	}
89	root	1.1	}
90			};
91			warn $@ if $@;
92	root	1.34	cf::cede_to_tick;
93	root	1.8	};
94	root	1.1	}
95			};
96	root	1.5
97	root	1.1	$SCHEDULER->prio (-2);
98