Is it my server or my crappy optimization?

Discussion in 'Bukkit Discussion' started by Phinary, Jan 15, 2012.

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  1. Offline

    Phinary

    I have been trying hard to optimize my server as much as possible, I also got some help from Nathan C for optimizing my mysql. This helped quite a bit but its not as good as I would like.

    Here are the server specs:
    AMD x2 250 Processor
    8gb ram
    500 GB harddrive
    Using a ramdisk for map
    Map limit is capped at 150mb (something like radius of 1500 blocks)
    only 1 world
    around 30-40 plugins.
    Java 7

    My tick rate is usually at about 19.85 - 19.95 TPS. (Using commandbook to find it, I also get the occasional message saying bukkit schedular is like 1 tick off or something)

    After I start up the server, it seems quite fast but once about 20 players log on it starts to feel a little more sluggish. Does anyone have ideas of how to optimize it or what the biggest factor of the lag would be caused from?


    Edit: Sorry, Just noticed that I posted this in the wrong section
     
  2. Offline

    sukosevato

    CPU is too weak. You got enough ram for 100 players. But the cpu can't even nearly handle that.

    Get a faster cpu and your problems will go away.
     
  3. Offline

    Vhab

    If your server starts feeling sluggish but you still maintain a near-20 tick count, it's probably your connection.
    As long as your tick count stays near-20 it's not your CPU.

    Tick count being off by 1 is fine.

    To really be sure, when it starts feeling sluggish, get metrics from the server.
    How much CPU is it consuming, how much memory is it consuming, how much bandwidth, etc.
    Get some hard stats to work with.
     
  4. Offline

    Phinary

    Im using about 60-80% cpu usage when it starts to feel sluggish. Here is my startup script: Im guessing this script isnt optimized at all for my server, although I dont know the differences between things like AMD processors and intel ones.

    java -Xmx6G -XX:permSize=128m -XX:MaxPermSize=256m -XX:+DisableExplicitGC -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled -XX:+UseNUMA -XX:+UseLargePages -XX:MaxGCPauseMillis=55 -XX:+UseAdaptiveGCBoundary -XX:-UseGCOverheadLimit -XX:+UseBiasedLocking -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15 -XX:UseSSE=3 -XX:+UseFastAccessorMethods -XX:+UseStringCache -XX:+UseCompressedStrings -XX:+OptimizeStringConcat -XX:+AggressiveOpts -jar minecraft_server.jar

    I usually hover around 3-4gb ram usage.
     
  5. Offline

    Nathan C

    Use "top" and see what your CPU use is.

    If it is not at 100% during times when it "slows down", then it is not your CPU.

    Also, you forgot to mention that you are using SpoutCraft and not CraftBukkit, which I personally think is your issue. I have hosted 30 people with 20 TPS on a Core 2 Duo @ 2.2 Ghz with lots more intensive plugins that you have before........but that was with CraftBukkit. With the SpoutCraft, who knows how the performance is.
     
  6. Offline

    EIFEL

    I have trouble with optimalization too. :-(

    My Server (AMD 2x 8Core 2.0 GHz , 32 GB DDR3 ECC) >
    MC VPS: 8x 2.0 GHz, 16GB RAM
    1-5 > 20 TPS
    6-10 > 14 TPS (WTF?)
    11-20> 8 TPS (WTF?)
    21 - more > 2 TPS (WTF?)
    Now 40 players -> 1.8TPS (WTF?)

    Here is my startup script:Here is my startup script:
    Code:
    java -Xmx3G -Xms2048M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=2 -XX:+AggressiveOpts -jar craftbukkit.jar nogui
    Plugins:
    BorderGuard
    LagMeter
    properTime
    +My plugin (without its TPS low too)
     
  7. Offline

    wardevour

  8. Offline

    EIFEL

  9. Offline

    wardevour

    did u try the garbage collection? i start my server with
    java-Xincgc-Xmx3G-jar craftbukkit-1.1-R1-SNAPSHOT.jar nogui

    i run a lamp and dynmap all from the same $50 machine and it works fine. 4gig of ram. no idea what cpus sorry.
    EDIT: Ubuntu 11.04 amd64 , java 6.30 x64
     
  10. Offline

    Nathan C

    You probably can't get much better with yours.

    It is a VPS, meaning that all of your resources are shared, including your CPU. I doubt you can even get full access to one core.

    Although the best you could do is:
    Java 7 64 bit
    64 Bit Linux distro
    And this startup flag:
    Code:
    java -Xmx10G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=2 -XX:+AggressiveOpts -jar craftbukkit.jar nogui
     
  11. Offline

    EIFEL

    VPS is by VMware hypervizor and sharing CPU is disabled in settings and cores ale selected manually.
     
  12. Offline

    Phinary

    I also occasionally have an issue with blocks respawning. I run the server in a ramdisk, so would this be from me doing something wrong or can that just be caused by high ping or something? I live in canada and the server is in NL
     
  13. Offline

    Nathan C

    Ok and who is your host?

    EDIT:
    If possible, give the link to the exact VPS package that you bought.
     
  14. Offline

    EIFEL

    It's my own server (I created this VPS)
     
  15. Offline

    Tanite

    I never had good performance on a VPS (and I tried several). Sadly...
     
  16. Offline

    masphil98

    hey dude its me masphil98 what is your server ip me and 'vohan' where trying to find a server to play on before christmas but nothing came up. message me back the ip and other info thanks
     
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