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-Xmx : max heap size -Xms : min heap size Think of it as the initial and the maximum amount of memory you want to give to the server. Don't make it too tight (OS will need some ram, as does the java permanent space), since you will want to avoid swapping.

Thanks for posting the application for your friend, Steven. Welcome to the server, Virny!

If you have 3 GB available, then you could try increasing the Xmx, as you'll probably have more than 1GB free for minecraft to use.

0 overworld -1 nether 1 end 7 twilight forest

First off, I cannot speak from experience on this one. That said, it looks like Tech world is a subset of Ultimate. You can do a quick compatibility test yourself. Basically, try to connect to your Tech world server using the Ultimate client. You will have to do one thing first though for...

Thanks for the detailed info. :) One workaround atm seems to be to only use computers, which seem to work better than turtles. The CC devs have also acknowledged the bug and are working on a fix. So fingers crossed they can find this nasty bug soon.

Well, it was worth a shot. :) I'm curious what you find out if it crashes again.

Computercraft rednet deadlock? Take a look at this thread for more info: http://forum.feed-the-beast.com/threads/server-crash-freez-every-40-minutes.16181/

There is another thread with pretty much the exact same question: http://forum.feed-the-beast.com/threads/server-cpu-usage-extremely-high.16130/

TickThreading has some excellent profiling options. http://forum.feed-the-beast.com/threads/tickthreading-concurrent-entity-tile-entity-ticks-and-other-optimisations.6498/ Make copy of your server Install TickThreading (grab the latest) Do a /profile e 60 and see if there are any culprits...

I think those are the ones. If you set those to 0 and you still get the deadlocks, then it is something else. Good luck. :) (let your users know, so they don't spend hours trying to figure out why rednet isn't working ;))

You might want to use a dynamic DNS service. That way you do not have to tell your friends about a new IP every time it changes. For example: http://www.dnsdynamic.org/

TickThreading has some excellent profiling options. Make copy of your server Install TickThreading (grab the latest) Do a /profile e 60 and see if there are any culprits /ticks is also great to see if there are certain regions With your number of cores, TT might be a good idea in general. Just...

Just a quick workaround idea how to disable the modems easily: Another attempt to bring attention to this issue (incase anyone wants to add some info). http://www.computercraft.info/forums2/index.php?/topic/11525-a-busy-rednet-causes-deadlocks/

Oh, that's great. Then you do have access to all the computercraft files. You can find them in wolrd/computercraft. Depending on how many folders you find there, you could rename the startup files by hand. Chunkloading is spread out over different files, and is on second thought not that...

That won't do anything (the name of the jar files does not matter). You could remove computercraft alltogether, but that WILL DELETE everything computercraft related permanently. I highly advise against that. Do you have access to config files? You could disable chunkloading and reenable it...

A way to test if it is computercraft would be to rename all startup files to something else, so that no computer is running code after the server restarts. If that wasn't the case, you can rename it back later. On linux you would do something like this: find -name startup -exec mv {}...

The server I run doesn't use multiverse. It could just be coincidence that people started using rednet/modem when you added it? Or it may be another issue altogether. Abdiel, who plays on the server, does alot with rednet and replicated it without problem in a single player world. He keeps up...

It has a chance to happen when they send messages. It appears to happen much more frequently with turtles than with computers. If you want to make sure it never happens, I fear you will have to tell your users to not use it for now. If you are fine for it to rarely happen, ask them to not use...