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#! perl |
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|
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# this plug-in prefetches maps. everytime a player enters a map, |
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# it will asynchronously prefetch files from disk (it will not load them |
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# into the server, but into the OS cache only). |
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|
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use Errno (); |
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use Time::HiRes; |
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use Fcntl; |
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use IO::AIO; |
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|
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# find all potential exit paths, this is slow, so this info is cached |
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sub find_exits { |
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my ($map) = @_; |
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|
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my %exit; |
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|
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for my $x (0 .. $map->width - 1) { |
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for my $y (0 .. $map->height - 1) { |
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for (grep $_->type == 66, $map->at ($x, $y)) { |
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my $path = $_->slaying; |
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|
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next if 3 > length $path; |
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|
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$path = cf::maps_directory cf::path_combine_and_normalize $map->path, $path; |
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|
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$exit{$path}++; |
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} |
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} |
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} |
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|
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[keys %exit] |
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} |
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|
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my @PREFETCH; |
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my %MAP_TIMEOUT; |
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|
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sub prefetch; |
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sub prefetch { |
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while (my $path = shift @PREFETCH) { |
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my $NOW = Time::HiRes::time; |
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|
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next if $MAP_TIMEOUT{$path} > $NOW; |
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|
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$MAP_TIMEOUT{$path} = $NOW + 60 + rand 60; |
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|
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if (my $map = cf::map::has_been_loaded $path) { |
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next if $map->in_memory == cf::MAP_IN_MEMORY; |
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|
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$path = $map->tmppath if $map->in_memory == cf::MAP_SWAPPED; |
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} |
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|
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aio_open $path, O_RDONLY, 0, sub { |
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my $fh = shift |
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or return; |
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aio_readahead $fh, 0, -s $fh, sub { |
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my $time = Time::HiRes::time - $NOW; |
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warn "LONG PREFETCH $path $time\n" if $time > 0.3; |
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|
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prefetch; |
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}; |
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}; |
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|
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last; |
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} |
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} |
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|
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my %MAP_EXITS; |
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|
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sub on_mapenter { |
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my ($ob) = @_; |
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|
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my $exit = $MAP_EXITS{$ob->map->path} ||= find_exits $ob->map; |
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|
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push @PREFETCH, @$exit; |
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prefetch; |
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} |
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|
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sub on_clock { |
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# boy how I hate polling |
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IO::AIO::poll_cb; |
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} |
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