Everyone (and I mean everyone) on my 100% 1.7.2 Vanilla server is getting general server lag.
(This includes block lag/mob lag/chat lag/movement lag etc.)
I run the server on a dedicated CAT6 line. (http://www.speedtest.net/my-result/3059882600)
Even when connecting a local client with localhost it has this general 'server lag'.
I can't quite pinpoint the cause of the lag as of yet, but we really only started noticing it since 1.7.2, I've been keeping the server updated along with the snapshots and they seemed fine right before.
I tried disabling all redstone devices.
I tried staying in some of the same loaded chunks.
I tried kicking everyone off.
I tried dedicating a whole 5Gigs of RAM to the server.
I tried dedicating a whole 8Gigs of RAM to the client on another computer with similar specs.
I tried giving the Java Runtime High priority.
Nothing shows in the server log as going wrong however it does constantly show that it can't keep up.
(http://pastebin.com/PtehcSde)
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Yeah highest current count of entities is 73 and it is indeed lagging now as I write.
Also it isn't at all frame lag. No one is having FPS lag, just server lag.
Are people generating new chunks? Because that can cause server lag as well, especially if many people are genrating new lands at the same time.
That is what I thought initially.
But I kicked everyone off to try yesterday, and just me on the server still had some lag.
I am the only one on currently as well and have lag right now. (and I am playing in one spot )
...and you're server is 100% Vanilla? That is very very strange... The problem is not the server itself, but the game...
Mods will mark this as a "technical problem" (at least they did it here: MC-25720), I'll still try to solve the problem.
Are there any special things on the server (like many spawners or similar)?
Did the server use Bukkit or similar in earlier versions (1.6)?
Maybe someone else can think of anything else...
I have the same issue, server is 1.7.4 (world generated with 1.7.2 a few weeks ago.) It was fine with 2 active players until two days ago, when the other player started exploring great distances in search of horses. The server quickly became unplayable just from this surface exploring. It was fine for weeks with 1G allocated to the java machine, I've doubled that and reduced the server render distance to 8. Otherwise the server is running defaults.
Ubuntu 13.10, Java 1.7.0_51 launched with -d64 -Xmx2048 -Xms1024 and nogui, on a 64-bit Intel i7 with 4 dual-cores and 6G of total ram.
The host does nothing else, and 'top' shows the java process is over 1.2Gig when the lag begins. I can restart the server and it's fine for a while, until we start exploring again. The conjecture that the issue is chunks failing to unload when unoccupied strikes me as the most likely issue on my server.
If there is any instrumentation or debug logging I can enable that may help diagnose this, please feel free to contact me. I am a developer myself but java is not my current focus and I'm my last professional work with it was back in the Java 1.2 days.
I run a 1.8 Snapshot server which started as a 4GB server with avg of 20 users an found it wasnt enough, so went to 8GB for the server an found it was also using the entire 8GB of memory .. So ive now gone to a 16GB server dedicated box and its consuming all the 16GB .. which i find is complete and utter BS! .... SO i feel there is some sort of a leak somewhere as a basic Vanilla server esp snapshot which is due to be a pre-release in a few days should not be consuming this much RAM ever, its crazy .... its using more then any mod pack ive ever played an more then What ive made ... so there has to be something wrong somewhere.
@Warren:
a) You haven't provided any data about your situation (startup parameters, java version, snapshot version, etc.)
b) You're post is not related to the original issue, which is High CPU with 1.7.x versions.
May I suggest that instead of venting your frustrations in this ticket, that you make a post to a community site, ( eg: minecraftforum.net), or one of the IRC help channels: http://minecraft.gamepedia.com/Minecraft_Wiki:IRC. These people can help you troubleshoot, and give you help to gather data that would be useful in creating a ticket of your own.
I understand the cathartic benefit of venting publicly, but it won't help you solve your problem. Which is the goal you want most to achieve?
Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
This ticket is incomplete without the requested information, no response has been received within a reasonable time and we are assuming the issue has been resolved. If you are still experiencing this issue, we can reopen it at your request.
Please review the guidelines before reporting issues.
How many entities are shown in the F3 screen? (I guess you checked that already, but just to be sure)
The zombie lag, as you might know, is fixed with 1.7, so that's not the cause. Honestly, I have currently no idea what this is caused by, the only thing that might be the case is that a mob spawner/similar got out of control (especially automated chicken and villager farms!)