[MUD-Dev] Re: Levels versus Skills, who uses them and when.
pvirkkul at iki.fi
Thu Jan 14 23:18:25 New Zealand Daylight Time 1999
>>>>> "Raph" == Koster, Raph<rkoster at origin.ea.com> writes:
Raph> [And yes, right here someone is going to say they implemented
Raph> remembering every room visited, or every room remembering who
Raph> visited it, and don't have that problem, and once again I'll
Raph> shudder at the data storage their mud entails.
I couldn't left this one unanswered ;-)
Our system contains multiple LPMud save files, one per "area"
(in the practice per wizard). They take 1.3MB disk space, and
not all of them are in the RAM at the same time (that depends
how players are travelling around the mud). The save files
contain object-path -> room number mapping. Room numbers are
reserved dynamically, ie. when a room is first time ever
entered it gets its unique room number. Currently there are
over 13000 room numbers reserved (not all rooms give explore
Every player object contains a bit string (6 bits
stored in a byte). Thus a player who has explored all those
13000 rooms takes around 2kB RAM. In the practice nobody has
explored all of those rooms, see
for real (though a bit old) percentages.
The nice thing in the dynamic allocation of the room numbers
is that the explore percentage rise steepens as players find
unvisited rooms. For example, if player A has found 4 rooms
out of 5 visited rooms and then finds a new unexplored room
his/her explore percentage goes from (4/5) 80% to (5/6) 83%,
not to 100%.
Assuming an average 50% explore coverage, the mud takes around
300*1kb=300kB RAM with 300 peak player count (plus the
object-path -> room number mappings) to maintain the explore
system. With 24000 player base disk space required by per
player data is around 24000*1kB=24MB.
Additionally we have a tracking system: all rooms keep
player/monster movements for 5 minutes in the RAM. That data
is not used by the explore system. Our tracking system is
something like quzah was visioning, though we do not take
account terrain type, only tracking skill percentage is used
when a player (usually a ranger) tries to read tracks left by
a fleeing player/monster.
Is the system worth of the used RAM and disk space? I think
so. Our machine has 1.25GB RAM and 17GB (mirrored) disk
space. Long before RAM and disk space are exhausted we have
run out of CPU power (and it is easier to buy more RAM
and disk than CPU power).
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