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  Synchronizing Time across a Darkstar Cluster  (Read 1042 times)
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Offline Hoyle

Senior Newbie





« Posted 2007-04-06 18:45:36 »

I've been working on a piece of my project that needs to synchronize time between clients and servers.  My original idea was to make everything use "server time", and have each client calculate a server time offset at startup by trading packets with the server.

The clients can now recieve a player move event which contains a starting point, direction, and velocity, and using the attached server time adjust the remote players position to reflect it more accurately (since network lag means some time has passed since the event was created).

So I've got this mostly working, and it's calling System.nanoTime() .  But I realized in a clustered environment this can be wildly different across nodes of the Cluster. 

Are their any suggestions about how I might get what I'm after that will work properly across the cluster?

Should I just use System.currentTimeMillis() since it's time since January 1, 1970 UTC instead of some arbitrary point that the nanoTime method uses?  I could assume all nodes in the cluster were running NTP and had their time synced.

Just curious about your thoughts or if I'm going about this all wrong?
Offline Jeff

JGO Coder




Got any cats?


« Reply #1 - Posted 2007-04-06 18:54:26 »

Yeah if you want synchronized time you really have to use currentTimeMIllis for that.

Be aware that currentTimeMillis has accuracy issues on Windows platforms but hopefully its below the resolution you care about for something like that...

Got a question about Java and game programming?  Just new to the Java Game Development Community?  Try my FAQ.  Its likely you'll learn something!

http://wiki.java.net/bin/view/Games/JeffFAQ
Offline Hoyle

Senior Newbie





« Reply #2 - Posted 2007-04-06 20:01:03 »

Thanks Jeff,

Yeah, I really only need 1/30th of a second accuracy most of the time anyway.
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