--- deliantra/server/ext/map-scheduler.ext	2007/01/02 21:13:22	1.7
+++ deliantra/server/ext/map-scheduler.ext	2007/07/28 14:32:21	1.40
@@ -1,19 +1,73 @@
-#! perl
+#! 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       =   50; # number of seconds after which maps inactive get swapped out
-our $SCHEDULE_INTERVAL  =    2; # time the map scheduler sleeps between runs
-our $SAVE_TIMEOUT       =   30; # save maps every n seconds
-our $SAVE_INTERVAL      =  0.3; # save at max. one map every $SAVE_INTERVAL
+#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::cede_to_tick;
+      cf::map::find $path;
+   }
+
+   # now hunt for resettable per-player maps
+   for my $login (@{ cf::player::list_logins or [] }) {
+      for my $path (@{ cf::player::maps $login or [] }) {
+         cf::cede_to_tick;
+
+         $path =~ /^~[^\/]+(\/.*)$/
+            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 $path;
+
+         if ($map->{deny_reset}) {
+            warn "found noreset map with resettable base map, resetting: $path\n";
+            delete $map->{deny_reset};
+         }
+      }
+   }
+};
+
+our $SCHEDULER = cf::async_ext {
+   my $timer = Coro::Event->timer (after => 1);
 
-our $SCHEDULER = cf::coro {
    while () {
-      Coro::Timer::sleep $SCHEDULE_INTERVAL;
+      $timer->interval ($SCHEDULE_INTERVAL);
+      $timer->next 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;
 
-      for my $map (values %cf::MAP) {
          eval {
             # not yet, because maps might become visible to players nearby
             # we need to remove the map from %cf::MAP and all tiled map links
@@ -24,18 +78,19 @@
             if ($map->should_reset) {
                $map->reset;
             } elsif ($map->in_memory == cf::MAP_IN_MEMORY) {
-               if ($map->last_access + $SWAP_TIMEOUT <= $cf::RUNTIME && !$map->players) {
+               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;
-                  Coro::Timer::sleep $SAVE_INTERVAL;
                } elsif ($map->{last_save} + $SAVE_TIMEOUT <= $cf::RUNTIME) {
                   $map->save;
-                  Coro::Timer::sleep $SAVE_INTERVAL;
+                  $map->{last_save} -= rand; # randomise map save times a bit
                }
             }
          };
          warn $@ if $@;
-         Coro::cede;
-      }
+         cf::cede_to_tick;
+      };
    }
 };