Server disconnection while using multitile city building

[Phystam]

we pak256-Ex team have experimentally introduced multitile city building, but it causes server disconnection.
I cannot provide the save data and the server since I am not in my home, if you introduced multitile city buildings in pak128.Britain-Ex, then you can observe that issue.

[Matthew]

I have been playing with multi-tile city buildings for several months. I only started to use a server a couple of weeks ago, but I have not noticed disconnections as a problem. I have seen other strange effects though, which I will try to report here soon.

[DrSuperGood]

Does it appear that the building is constructed on all clients at the moment of the OoS? If it does then the OoS might be due to different internal ordering or if somehow different object state result in a different structure state.

[jamespetts]

Thank you for the report, and apologies for not having had a chance to look into this hitherto.

I will need some more detail before I am able to look into this, especially as loss of synchronisation issues are usually very hard to track down. Do you have a version of Pak.256 that you can download in which these multi-tile buildings are present? If so, are you able to describe the circumstances in which the server and client will lose synchronisation in this case? It would also be extremely helpful to know the answer to Dr. Supergood's question, as this will help to narrow down where the problem is occurring.

[Phystam]

The latest distribution pakset (ver 2.0.1) has already such a multitile building.
in please_remove_this_when_playing_network_game.pak . (very hopeless name

[jamespetts]

Thank you for letting me know. Can anyone describe the circumstances in which the loss of synchronisation occurs whilst using this object?

[Phystam]

1. setup a server game (including the building).
2. try to connect to the server game as a client.
3. the client will be immediately disconnected.

You do not have to do anything special.

[jamespetts]

I did try a number of public player induced town growth cycles with the demo.sve, but this building was not constructed. It would be helpful if you could upload a saved game containing this building where I can investigate this issue. Thank you.

[jamespetts]

Can I ask at least in what year(s) that this building appears so that I can attempt to replicate this?

[Phystam]

It is available from 1961. However, you can build it by yourself, using the public player.

[jamespetts]

It is available from 1961. However, you can build it by yourself, using the public player.

Thank you. May I ask what the in-game name of the building is that I might find it?

[prissi]

In case this is not solved, I rewrote the multitile citybuilding code for standard because the rotation determination of that patch (and the way these buildings were selected) was not satisfying. I would expect the desync to occur in the selection of the multitile building.

Revisions r8847, and r8749 (and probably most changes in simcity.cc in between ...

[Phystam]

James, the name is "public apartment complex."

[jamespetts]

James, the name is "public apartment complex."

Thank you for that.

In light of Prissi's comment above and the fact that you are working on incorporating the changes from Standard (which is extremely helpful), I wonder whether you might look into incorporating the Standard implementation of multi-tile city buildings sooner than some of the other features and test whether this fixes the problem? This might well be an efficient way of proceeding, and would be very helpful.

[Phystam]

Unfortunately, prissi's bug fix is thousands of commit fast-forward, so the code is completely different.
I'm stepping one by one. I flew almost 1 year, and now it is r7665.
I am a time traveler from Standard to Extended^^

[Phystam]

I started a server game with the multi-tile city building, and I successfully connected to the server without desync.
Probably... it is solved.

[Sirius]

Just a time traveller? Isn't extended even a parallel universe