Server Lag

[glasspelican]

death could you run these commands in a terminal and post the output

sudo lshw -class cpu -class memory -sanitize
java -version

 

[deathdragonaw]

1: "sudo: lshw: command not found"
2: "java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.5) (6b24-1.11.5-0ubuntu1~10.04.2)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)"

 

[glasspelican]

is java1.6 the latest version for ubuntu 10.04?
Im running ubuntu 12.04
java version "1.7.0_09"
OpenJDK Runtime Environment (IcedTea7 2.3.3) (7u9-2.3.3-0ubuntu1~12.04.1)
OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)

so if red power uses any of the new features from java 1.7 that might be your crash OR ... I need your cpu model information, specificity the supported sse instruction set versions
if you install lshw and run the above command it will give you that info

sudo apt-get install lshw

 

[deathdragonaw]

problem solved, i created a new map with fresh server files and replaced it with my old one and the player files. The cause was somewhere in the files created from one of the mods, i guess redpower

 

[Jojo.bacon]

Could not create the java virtual machine
a fatal error has occurred?
Why is this?

 

[glasspelican]

jojo please post your system specks, ram cpu etc.
then open the terminal or command prompt and run

java -version

also post the error message.

 

[Jojo.bacon]

jojo please post your system specks, ram cpu etc.
then open the terminal or command prompt and run

java -version

also post the error message.

It's fine. Got it working. Made a noob mistake.

 

[deathdragonaw]

My lags are still there and they get bigger and bigger, we even get kicked from the server now sometimes. I deactivated two other gameservers (minecraft with bukkit and BF2142) although they didn't use much CPU nor RAM and started the FTB server with the following line

java -Xmx2048M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=1 -jar direwolf20.jar nogui

The only change is a huge cpu usage but the lags keep existing.

CPU info:

*-memory
description: System memory
physical id: 0
size: 8GiB
*-cpu
product: Intel(R) Xeon(R) CPU E5645 @ 2.40GHz
vendor: Intel Corp.
physical id: 1
bus info: cpu@0
width: 64 bits
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt aes lahf_lm ida arat tpr_shadow vnmi flexpriority ept vpid

 

[glasspelican]

I recommend adding

-server
-XX:+AggressiveOpts
-XX:UseSSE=4 
-XX:+UseFastAccessorMethods

I have seen -server reduce cpu usage by 20% on some systems
sse is a data parallel instruction set, it can give a Huge speed boost if there is code that can use it, your cpu supports SSE4.2 so we tell it to use the sse4 family

then set up the parallel garbage collection

-XX:CMSFullGCsBeforeCompaction=1
-XX:+CMSParallelRemarkEnabled
-XX:+UseCMSCompactAtFullCollection

disable the old garbage collection system

-XX:+UseParNewGC -XX:+DisableExplicitGC

now even with parallel GC happening java will still stop execution of the server to do a full GC and compaction, you want that to happen as fast as possible so give it several threads, if you only give it 1 then there was no point in turning on parallel GC at all

-XX:ParallelGCThreads=4

 

[deathdragonaw]

java -Xmx2048M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=1 -jar direwolf20.jar nogui -server -XX:+AggressiveOpts -XX:UseSSE=4 -XX:+UseFastAccessorMethods -XX:CMSFullGCsBeforeCompaction=1 -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection -XX:+UseParNewGC -XX:+DisableExplicitGC -XX:ParallelGCThreads=4

started server with this, i'll test if it changed something

 

[Jojo.bacon]

Wow! The server runs great! No lag at all!

 

[Oreo]

My server lags and IDK how to fix it my specs are

Intel Pentium B950 Dual Core
4GB of RAM
Intel Graphics 2000 (Intergrated)
Only want to run a server with me and my friend.

 

[deathdragonaw]

started server with this, i'll test if it changed something

Server seems to run a bitt better, cpu usage is a little lower and players dont get kicked now. but lags are still there

 

[glasspelican]

how may users are on your server? you may need to dedicate more ram
I recommend ~500M per user

 

[glasspelican]

Oreo are you running the server and client on the same computer, because that machine is going to struggle?
if its just the server then you should be fine

 

[Oreo]

im running it on the same comp so i play on the same comp and the server is on the same comp to..[DOUBLEPOST=1357503660][/DOUBLEPOST]Is there any possible way to do that?? like one of those java thing up there

 

[glasspelican]

I looked it up and your cpu supports sse4, so you should be able to use the above commands,
since your computer is a dual core you will want to change

-XX:ParallelGCThreads=4

to

-XX:ParallelGCThreads=2

the nice thing about this is you have nothing to loose by trying

 

[Oreo]

So what do I put in the start server bat BTW Its Mindcrack

 

[glasspelican]

you will want to do something like this

java -server -Xincgc -Xmx2G -XX:NewRatio=2 -XX:CMSFullGCsBeforeCompaction=1 -XX:SoftRefLRUPolicyMSPerMB=2048 -XX:+CMSParallelRemarkEnabled -XX:+UseParNewGC -XX:+DisableExplicitGC -Xnoclassgc -oss4M -ss4M -XX:+UseFastAccessorMethods -XX:CMSInitiatingOccupancyFraction=90 -XX:+UseConcMarkSweepGC -XX:UseSSE=4 -XX:+UseCMSCompactAtFullCollection -XX:ParallelGCThreads=2 -XX:+AggressiveOpts -cp your_jar_name_here.jar -jar your_jar_name_here.jar

you will need to change both of the "your_jar_name_here.jar" to the name of your .jar file

 

[deathdragonaw]

the server is kicking people again, its used to be several times during a short period. You said:

how may users are on your server? you may need to dedicate more ram
I recommend ~500M per user

then i could try allocating more RAM, cause we are 8 users but usually not only all together. The Problem is getting really annoying and killing the fun...

EDIT: First it seemed to run better, but the lags returned and the players get kicked off the server again :/