Please help! Server needs more RAM!

Hey my minecraft server has been getting so many people! At least 17 the first day, the only thing is...I only have it on 2555m of Ram. I have 4gb of ram. I am also using a mac, I am asking a couple questions. I have a big server too so heres what I ask... How do I increase my ram? How much ram should I have for a 20 people server? I only have a terminal that opens up the server, and when I type the xms thing or whatever (Im doing it correct I just dont know what it is now.) it says unknown console command. Please answer all my questions. Thanks -TrevIzSick

 

How do you increase RAM?
That's not too big problem if you are using PC, Mac is different story though.
Apple is getting lots of money from additional parts, so I'm pretty sure it will be expensive.
How much you should need? I don't know, but I think 2,5 GB is really low amount.

 

Apple does. But PC Parts work just fine in Mac's, just as fine as Mac OS runs on PC hardware

You dont type the "xms thing" in the minecraft server console, you need to write that in the startscript with that you start the server up, here's mine for example:

Code:

java -server -Xincgc -Xmx12G -Xms2G -Xmn1G -XX:NewRatio=2 -XX:CMSFullGCsBeforeCompaction=1 -XX:SoftRefLRUPolicyMSPerMB=2048 -XX:+CMSParallelRemarkEnabled -XX:+UseParNewGC -XX:+UseAdaptiveSizePolicy -XX:+DisableExplicitGC -Xnoclassgc -oss4M -ss4M -XX:+UseFastAccessorMethods -XX:CMSInitiatingOccupancyFraction=90 -XX:+UseConcMarkSweepGC -XX:UseSSE=4 -XX:+UseCMSCompactAtFullCollection -XX:ParallelGCThreads=4 -XX:+AggressiveOpts -cp "craftbukkit-0.0.1-SNAPSHOT.jar" -jar "craftbukkit-0.0.1-SNAPSHOT.jar" nogui

Also check this thread out for further explanation: http://forums.bukkit.org/threads/op...xtreme-way-p-need-feedback-thx-updated.25994/

 

Code:

java -server -Xincgc -Xmx12G -Xms2G -Xmn1G -XX:NewRatio=2 -XX:CMSFullGCsBeforeCompaction=1 -XX:SoftRefLRUPolicyMSPerMB=2048 -XX:+CMSParallelRemarkEnabled -XX:+UseParNewGC -XX:+UseAdaptiveSizePolicy -XX:+DisableExplicitGC -Xnoclassgc -oss4M -ss4M -XX:+UseFastAccessorMethods -XX:CMSInitiatingOccupancyFraction=90 -XX:+UseConcMarkSweepGC -XX:UseSSE=4 -XX:+UseCMSCompactAtFullCollection -XX:ParallelGCThreads=4 -XX:+AggressiveOpts -cp "craftbukkit-0.0.1-SNAPSHOT.jar" -jar "craftbukkit-0.0.1-SNAPSHOT.jar" nogui

Wooo, what that thing is doing?