Server lagging BAD. any thoughts to the cause?

[Cougar281]

A friend of mine set up a Tekkit server and I've helped him with it. Starting this morning, it seems the chunks that my stuff is in are lagging the server bad. Everythning was fine last night, then at some point during the night, I got disconnected. I've got two world anchors, one at my 'home' and one about 150 blocks away at my quarry. I set up few teleport pipes (4 regular teleport and 3 power teleport). Other than that, not much has changed. Initially, I thought it might be the world anchors, so I shut down the world, tarred it up and sterted it up on my private server, found the file that contained the world anchors (railcraft.dat) but the problem persists even thought he server now reports no world anchors.

Any thoughts how to tell what in my chunks are lagging the server so it becomes reposnsive again and it doesn't happen again?

[Lothos]

why is this not down in the tekkit smp area? If you have 1 quarry, why so many teleport pipes? what kind of machine is the server running on?

[Cougar281]

Ok, after messing around a bit, I somewhat figured it out. There were 14,513 drops. I had to bring the world up on my server whihc has essentials so I could remove the drops then put it back up on the proper server. About a minute after I deleted the drops, everything was back to normal.

I THINK what caused the drops is the pipe between the quarry and my home. I have noticed what appeared to be visual glitches on the pipes in the past where drops apper to be sitting on the pipes, but cannot be picked up when I head further away to another payers home. I made it part way down the tunnel my pipline is in and found what appeared to be a huge blob of drops in the pipe. My suspicion is the chunks between the world anchors unloaded causing all the drops to spew out into the tunnel, causing the lag.

The reason for 'so many' teleport pipes is I am experimenting/tesing with them at the moment. I have some questions, but I'll make a new thread for them.

I've read others say that buildcraft and pipes can lag a server bad, and based on this, I would say yes, but I think the solution would be the teleport pipes. I think the root cause was the pipe between the loaded chunks 'dissapearing'.

[Diabloz]

I have lag down to a science on my tekkit server, The problem with TPS lagg issues comes from many sources.

Here is a list on confirmed (based on my tests TPS) affecting things that will lag your server:

Wireless red stone - (i haven't found why, just it costs 3-5 TPS to run)

Quarries - (the bigger the laggier your server will be will usually after 1-15 TPS major Source of server Lag)

Buildcraft pipes - Laggy when having a large amount of items running through them (about 1-5 TPS)

IC2 machines and Power converters- will cost about 2TPS Max, will cause more client side lag rather

Terrible wiring- will cause some lag, usually 1-7 TPS on loaded chunks.

Computer craft Loops - Any os.reboot loop will cause about 1-18TPS server lag (can bring a server to its knees)

mob Entities - depends on number of players

Loaded chunks - depends on number of players and anchors

Error spams on consoles - Obvious don't ignore these.

Red power clocks/timers/cobble stone generators - varies

Large amount of plugin - these can have major impact, especially if they are poorly configured.

Tips:

under the buildcraft config setting there is a network manager setting increase the value to remove most of BC lagg, though quarries will still have major impact on server TPS

find a plugin that will Cap number of entities on your map

I created a linux script that will remove os.reboot loops

My Map moderates fix or remove laggy wiring/factories

Seriously think in removing plugins/mods your really don't need.

[Cougar281]

The server is vanilla Tekkit, no additional plugins.

I think a plugin to limit the number of drops would be a good idea. Thanks for the tip, I'll look for one.

In this particular instance, 14 thousand drops crippled the server.