July 1997
- A simple political/social system? Jon A. Lambert
- A simple political/social system? clawrenc@cup.hp.com
- A simple political/social system? Marian Griffith
- A simple political/social system? clawrenc@cup.hp.com
- A simple political/social system? Jon A. Lambert
- Wounds and trauma Adam Wiggins
- Wounds and trauma clawrenc@cup.hp.com
- Wear Location System Jon A. Lambert
- Level abstractions clawrenc@cup.hp.com
- (fwd) Popularity of text-based MUDS clawrenc@cup.hp.com
- trying again Chris Gray
- My page, such as it is. Michael A. Hohensee
- What happened? Michael Hohensee
- Testing coder@ibm.net
- > Integrating PK Matt Chatterley
- Level abstractions / Game realism issues Matt Chatterley
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling Chris Gray
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Chris Gray
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Jon A. Lambert
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Jon A. Lambert
- C&C and Event Rescheduling Jon A. Lambert
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Nathan Yospe
- C&C and Event Rescheduling Adam Wiggins
- C&C and Event Rescheduling Richard Woolcock
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Richard Woolcock
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Adam Wiggins
- C&C and Event Rescheduling Marian Griffith
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Adam Wiggins
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Miroslav Silovic
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Jon A. Lambert
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling Miroslav Silovic
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Miroslav Silovic
- C&C and Event Rescheduling Miroslav Silovic
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Miroslav Silovic
> To an extent however it could reduce responsiveness:
>
> Very long event X starts processing.
> Near the end of X's run: very short event Y starts processing.
> Y locks resource A.
> X requests A and dies.
>
> Didn't you have some sort of age/priority scheme in there to counter
> this? I seem to remember something such.
Yes, I had a-priory prioritizing in mind. Although I didn't put it down
into any sort of specification, the idea would be that things like
create/destroy/change parents would run with high priority. While these
take relatively long time to complete in some cases, they'll at least
survive other tasks.
> >I consider this a good thing. Remember, you have change_parents
> >function in Cold. When you call it, it guarantees that the database
> >will be consistant after termination.
>
> FWLIW I have a similar call, but I don't guarantee consistancy.
> Instead I rebuild the inheritance tree when an outdated object is
> detected. This doesn't change the workload much -- it just spreads it
> out over time.
No, the problem we deal with is this: Suppose you have a helpnode, and
some moron decides to reparent it to room. Now this is almost surely
and admin mistake, but this is what then happens: helpnode is tracked
by help indices, and rooms are tracked by their realms. Now if you
/only/ change the inheritance, you have a room in a help index and
a room without its realm. This, of course, is a Bad Thing, because
you have also broken the help index.
The idea, then, is to call destructor method that destroys the helpnode
part of the help node (indidentally removing it from its index) and
calls constructor that does the housecleaning needed to add a consistant
room.
Now do this to a helpnode with 2000 descendants. Each of them is a
helpnode and, well, needs to be cleared.
Of course, this is not very realistic example, but adding parents to
user object may well be very desirable, and if the parent require
some internal state (suppose you're adding combat stats object to user),
Cold will guarantee that the entire hierarchy is properly initialized.
This has *huge* working set, but the alternative of /not/ doing it
caused incredible number of problems in the past (it's utterly
annoying to have, for example, invalid objects in the player database).
> Were I to do this sort of mass munging of the DB by a single event,
> I'd have the event start at one of the higher priority levels --
> potentially even at single-threaded mode. I can do that.
Right - but it's still good to have it terminate even if the admin
forgot to tune the priority.
> >Actually I intend to reschedule the tasks with random delays,
> >precisely because of this (I believe this solution is standard).
> >Deadlock is improbable, then, because sooner or later things will
> >schedule in the right order, with proper pause between each.
>
> Random rescheduling is a standard approach, however I wouldn't label
> it a solution. You might like to do a simulation here. I suspect
> you'll be surprised by the results. The problem of this approach is
> that its incredibly sensitive to both the load and to range of the
> random number generated.
>
> Specific case: If the random generation varies by a value which is
> generally far smaller than the specific contending events in question,
> then they'll continue to contend for a long while. There are other
> nasty cases (a simulation should show you most of the nasty ones).
I actually intended to double the random delay on each reschedule.
This should take care of most of the problems. But you're quite
right, this will take some experimenting. Mind you, we don't even
have OS-level threading in place (or even in progress) yet. :)
I'm actually interested on your opinion on doubling the delays each
time (well, doubling value 'x', then getting the delay as random(x),
to be more precise).
> >> Aside: Its not distributable, well, not in any sane manner, whereas
> >> the lockless model rolls out there pretty easily, especially if you
> >> allow objects to migrate between DB servers.
>
> >My method would support RPC model of distribution, with remote
> >proxies...
>
> This sounds a lot like Cool's model.
Exactly. Cold model, unlike Cool's, combines core with driver support
(it uses extended frobs for proxies, and method calls on those objects
get redirected to the core object that does the marshalling and sends
the call to the remote).
> Unter originally took the replication model. Latter design
> discussions that I've heard of spoke of doing RPC until a threshhold
> value (balance of local calls to remote calls from specific target) at
> which point the object would be moved to the preferential server.
I like this, but i'd have to do some thinking to figure how to do it
(well, of course, I'll not be the only one to do the thinking).
Miro - C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Miroslav Silovic
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Jon A. Lambert
- C&C and Event Rescheduling Shawn Halpenny
- C&C and Event Rescheduling Jeff Kesselman
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Jeff Kesselman
- C&C and Event Rescheduling clawrenc@cup.hp.com
- C&C and Event Rescheduling Jeff Kesselman
- not about pk anymore Marian Griffith
- not about pk anymore Huibai
- not about pk anymore Matt Chatterley
- not about pk anymore clawrenc@cup.hp.com
- not about pk anymore Alex Oren
- not about pk anymore Matt Chatterley
- not about pk anymore clawrenc@cup.hp.com
- natural language parser (Output) Nathan Yospe
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Adam Wiggins
- Virtual Chemistry Jon A. Lambert
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Jon A. Lambert
- Virtual Chemistry Adam Wiggins
- Virtual Chemistry Jon A. Lambert
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Michael Hohensee
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Marian Griffith
- Virtual Chemistry Chris Gray
- Virtual Chemistry Marian Griffith
- Virtual Chemistry Chris Gray
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Chris Gray
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry clawrenc@cup.hp.com
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Nathan Yospe
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Nathan Yospe
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Marian Griffith
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Marian Griffith
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Jon A. Lambert
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry clawrenc@cup.hp.com
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry clawrenc@cup.hp.com
- Virtual Chemistry Marian Griffith
- Virtual Chemistry Jon A. Lambert
- Virtual Chemistry Brandon Van Every
- Virtual Chemistry Jon A. Lambert
- Virtual Chemistry Huibai
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Matt Chatterley
- Virtual Chemistry Adam Wiggins
- Virtual Chemistry Huibai
- Virtual Chemistry Marian Griffith
- Virtual Chemistry clawrenc@cup.hp.com
- Combat Adam Wiggins
- Attn JCL: A scenario for you Alex Oren
- Combat messages Marian Griffith
- Combat messages Adam Wiggins
- Combat messages Martin Keegan
- Combat messages Matt Chatterley
- What about drugs? Nathan Yospe
- What about drugs? Adam Wiggins
- What about drugs? Jon A. Lambert
- What about drugs? Martin Keegan
- coord-based recap? Huibai
- coord-based recap? clawrenc@cup.hp.com
- Docs uploaded Chris Gray
- What are the elements of playabilty? clawrenc@cup.hp.com
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Cynbe ru Taren
- META: Making the list public? coder@ibm.net
- META: Making the list public? Michael Hohensee
- META: Making the list public? Chris Gray
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Brandon Gillespie
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Michael Hohensee
- META: Making the list public? Brandon Gillespie
- META: Making the list public? Shawn Halpenny
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Shawn Halpenny
- META: Making the list public? Alex Oren
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Shawn Halpenny
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Jon A. Lambert
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Matt Chatterley
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Huibai
- META: Making the list public? Martin Keegan
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Marian Griffith
- META: Making the list public? Jon A. Lambert
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Shawn Halpenny
- META: Making the list public? clawrenc@cup.hp.com
- META: Making the list public? Matt Chatterley
- Longbows and such. Cynbe ru Taren
- R-trees &kin Cynbe ru Taren
- R-trees &kin Martin Keegan
- META: Making the list public? S001GMU@nova.wright.edu
- META: Making the list public? clawrenc@cup.hp.com
- META: C&C and Event Rescheduling clawrenc@cup.hp.com
- Source data on Crossbows clawrenc@cup.hp.com
- Source data on Crossbow Cynbe ru Taren
- Source data on Crossbow Matt Chatterley
- Source data on Crossbow Cynbe ru Taren
- Source data on Crossbow Matt Chatterley
- Source data on Crossbow clawrenc@cup.hp.com
- Source data on Crossbow Matt Chatterley
- Source data on Crossbow clawrenc@cup.hp.com
- Source data on Crossbow Matt Chatterley
- Source data on Crossbow Caliban Tiresias Darklock
- Source data on Crossbow Marian Griffith
- Source data on Crossbow clawrenc@cup.hp.com
- Source data on Crossbow Orion Henry
- Source data on Crossbow Cynbe ru Taren
- Source data on Crossbow Matt Chatterley
- Source data on Crossbow Michael Hohensee
- Source data on Crossbow Matt Chatterley
- Source data on Crossbow clawrenc@cup.hp.com
- Source data on Crossbow daggers@iquest.net
- Source data on Crossbow Rudy Neeser
- Source data on Crossbow Malcolm Tester II
- Source data on Crossbow Travis Casey
- Source data on Crossbow rayzam
- Source data on Crossbow Blane Bramble
- Source data on Crossbow Daniel Carruth
- Source data on Crossbow Michael Tresca
- Source data on Crossbow Bobby Martin
- Source data on Crossbow Christopher Kohnert
- Source data on Crossbow Bobby Martin
- Source data on Crossbow Christopher Kohnert
- Source data on Crossbow Dave Rickey
- Source data on Crossbow werda555@yahoo.com
- Source data on Crossbow Nathan Yospe
- Source data on Crossbow Travis Casey
- Source data on Crossbow Bobby Martin
- Source data on Crossbow Hans-Henrik Staerfeldt
- Source data on Crossbow Bobby Martin
- Source data on Crossbow Ben Tolputt
- Source data on Crossbow andy.wharton@ascentialsoftware.com
- Source data on Crossbow Skaei@aol.com
- Source data on Crossbow rayzam
- Public Archives (META: Making the list public?) Brandon Gillespie
- Socrates - A brief look at AI(?) Jon A. Lambert
- Evil coders from beyond the grave Matt Chatterley
- Evil coders from beyond the grave Orion Henry
- Evil coders from beyond the grave Matt Chatterley
- Evil coders from beyond the grave Chris Gray
- Evil coders from beyond the grave Matt Chatterley
- Evil coders from beyond the grave Adam Wiggins
- Evil coders from beyond the grave Matt Chatterley
- Graphical MUDs Michael Hohensee
- Graphical MUDs Cynbe ru Taren
- Graphical MUDs Michael Hohensee
- Graphical MUDs Shawn Halpenny
- Graphical MUDs clawrenc@cup.hp.com
- Graphical MUDs Chris Gray
- Brief bio Niklas Elmqvist
- Brief bio Martin Keegan
- Multi-threaded programming under Linux Greg Munt
- Multi-threaded programming under Linux Nathan Yospe
- Multi-threaded programming under Linux Cynbe ru Taren
- Multi-threaded programming under Linux S001GMU@nova.wright.edu
- Multi-threaded programming under Linux Chris Gray
- Multi-threaded programming under Linux Jeff Kesselman
- Multi-threaded programming under Linux Cynbe ru Taren
- Multi-threaded programming under Linux Orion Henry
- Multi-threaded programming under Linux Michael Hohensee
- Multi-threaded programming under Linux] Michael Hohensee
- Multi-threaded programming under Linux clawrenc@cup.hp.com
- Multi-threaded programming under Linux Jon A. Lambert
- Multi-threaded programming under Linux Nathan Yospe
- Multi-threaded programming under Linux Jon A. Lambert
- Multi-threaded programming under Linux Alex Oren
- Multi-threaded programming under Linux clawrenc@cup.hp.com
- Multi-threaded programming under Linux clawrenc@cup.hp.com
- (fwd) LP: How does it work? coder@ibm.net
- Collision detection coder@ibm.net
- OT: Multi-threaded programming under Linux coder@ibm.net
- Motivating people Greg Munt
- Motivating people Chris Gray
- Motivating people Huibai
- Motivating people clawrenc@cup.hp.com
- Motivating people Jon A. Lambert
- Motivating people Greg Munt
- Motivating people clawrenc@cup.hp.com
- Motivating people clawrenc@cup.hp.com
- OT: Multi-threaded programming under linux Orion Henry
- Graphic MUDS. Jeff Kesselman
- Graphic MUDS. Chris Gray
- Graphic MUDS. Jeff Kesselman
- Graphic MUDS. Chris Gray
- Graphic MUDS. Matt Chatterley
- Graphic MUDS. Adam Wiggins
- Graphic MUDS. Chris Gray
- Graphic MUDS. Michael Hohensee
- Graphic MUDS. Jon A. Lambert
- Graphic MUDS. clawrenc@cup.hp.com
- Graphic MUDS. Adam Wiggins
- Graphic MUDS. Martin Keegan
- Graphic MUDS. Adam Wiggins
- Graphic MUDS. clawrenc@cup.hp.com
- Graphic MUDS. Martin Keegan
- Graphic MUDS. Matt Chatterley
- Graphic MUDS. Jeff Kesselman
- Graphic MUDS. clawrenc@cup.hp.com
- Stories? Marian Griffith
- KaVir Nathaniel Blundell
- OT: Server Web Site Jon A. Lambert
- Recent mail delivery problems... clawrenc@cup.hp.com
- Mail not getting to the list coder@ibm.net
- Mail not getting to the list Caliban Tiresias Darklock
- Mail not getting to the list Jeff Kesselman
- Graphic MUDS/Ultima Online Koster, Raph
- Graphic MUDS/Ultima Online Adam Wiggins
- Graphic MUDS/Ultima Online Koster, Raph
- Graphic MUDS/Ultima Online Jeff Kesselman
- Graphic MUDS/Ultima Online Adam Wiggins
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online Koster, Raph
- Graphic MUDS/Ultima Online Jeff Kesselman
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online Adam Wiggins
- Graphic MUDS/Ultima Online Alex Oren
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Koster, Raph
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Chris Gray
- Graphic MUDS/Ultima Online Richard Woolcock
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online Chris Gray
- Graphic MUDS/Ultima Online Jeff Kesselman
- Graphic MUDS/Ultima Online Nathan Yospe
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online Richard Woolcock
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online Jeff Kesselman
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online Richard Woolcock
- Graphic MUDS/Ultima Online Nathan Yospe
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Richard Woolcock
- Graphic MUDS/Ultima Online Nathan Yospe
- Graphic MUDS/Ultima Online Adam Wiggins
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online Koster, Raph
- Graphic MUDS/Ultima Online Jeff Kesselman
- Graphic MUDS/Ultima Online Michael Hohensee
- Graphic MUDS/Ultima Online Adam Wiggins
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Matt Chatterley
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online Jeff Kesselman
- Graphic MUDS/Ultima Online Adam Wiggins
- Graphic MUDS/Ultima Online Jeff Kesselman
- Graphic MUDS/Ultima Online Adam Wiggins
- Graphic MUDS/Ultima Online Jeff Kesselman
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- Graphic MUDS/Ultima Online clawrenc@cup.hp.com
- First Muds - newbie magic? Nathan Yospe
- First Muds - newbie magic? clawrenc@cup.hp.com
- First Muds - newbie magic? Martin Keegan
- Dynamic Descriptions Nathan Yospe
- Dynamic Descriptions Chris Gray
- Dynamic Descriptions Martin Keegan
- Dynamic Descriptions clawrenc@cup.hp.com
- Dynamic Descriptions Nathan Yospe
- Dynamic Descriptions Jeff Kesselman
- Dynamic Descriptions clawrenc@cup.hp.com
- Dynamic Descriptions Jeff Kesselman
- Persistant worlds, Dan Huibai
- Worlds VS Games, etc {was GMuds, UO} Nathan Yospe
- Worlds VS Games, etc {was GMuds, UO} Koster, Raph
- OT: NIS/AlterNIC and the DNS system Caliban Tiresias Darklock
- OT: Mail not getting to the list clawrenc@cup.hp.com
- OT: Mail not getting to the list clawrenc@cup.hp.com
- Persistance/stability Chris Gray
- Persistance/stability Miroslav Silovic
- Persistance/stability Matt Chatterley
- Persistance/stability clawrenc@cup.hp.com
- Persistance/stability Chris Gray
- Persistance/stability Brandon Gillespie
- Persistance/stability Adam Wiggins
- Persistance/stability Chris Gray
- Persistance/stability Adam Wiggins
- Tilting at the SimWindmill - was UO Jon A. Lambert
- DESIGN: The purpose of MUDding? coder@ibm.net
- DESIGN: The purpose of MUDding? Brandon Van Every
- DESIGN: The purpose of MUDding? Matt Chatterley
- DESIGN: The purpose of MUDding? Brandon Van Every
- DESIGN: The purpose of MUDding? Matt Chatterley
- DESIGN: The purpose of MUDding? clawrenc@cup.hp.com
- DESIGN: The purpose of MUDding? Matt Chatterley
- DESIGN: The purpose of MUDding? Jeff Kesselman
- DESIGN: The purpose of MUDding? Jeff Kesselman
- DESIGN: The purpose of MUDding? clawrenc@cup.hp.com
- DESIGN: The purpose of MUDding? clawrenc@cup.hp.com
- DESIGN: The purpose of MUDding? clawrenc@cup.hp.com