Minecraft – Is this the correct Java command for Minecraft

minecraft-java-edition

I wanted to run Minecraft and tell it to use more RAM than whatever its default is, the purpose was to decrease loading times when entering new biomes and the like.

I saw, when using the name command given to me in this question's answer by Tobias, that part of the line had a section for memory (-Xms -Xms).

java -Xms2048m -Xmx2048m -cp "%APPDATA%\.minecraft\bin\*" -Djava.library.path="%APPDATA%\.minecraft\bin\natives" net.minecraft.client.Minecraft "yournamehere"

However, I wanted a command that allowed me to change the maximum memory, without skipping the login process. I searched Gameing.SE for Minecraft-Memory questions and found this question which had a nice line of code in an answer that was stated to improve Minecraft performance.

"C:\Program Files\Java\jre6\bin\java" -Dsun.java2d.noddraw=false -Dsun.java2d.d3d=true -Dsun.java2d.opengl=false -Xms2048M -Xmx2048M -jar "C:\minecraft.jar"

Now my minecraft.jar file isnt sitting naked in my C: drive to my knowledge, and also I dont seem to need the full directory path to java, or else the first command I annotated wouldnt work. So what I came up with is this:

java -Dsun.java2d.noddraw=false -Dsun.java2d.d3d=true -Dsun.java2d.opengl=false -Xms2048M -Xmx2048M -jar "C:\Users\Ender\Desktop\Minecraft.exe"

When I run it, my Minecraft.exe file runs properly (it seems) and I can login (or attempt to anyway if my internet is being difficult) but I have no idea if the command is actually working as I intended it to. Is this command right? Or is it wrong and just seems as if it's right?

Best Answer

I think it's ok, but many of the tutorials and stuff uses javaw.exe instead of java.exe, the first one looks a little bit weird with %APPDATA%.minecraft\bin*, and I think you should use full path to java just for safety, try this:

"C:\Program Files\Java\jre6\bin\javaw.exe " -Dsun.java2d.noddraw=false -Dsun.java2d.d3d=true -Dsun.java2d.opengl=false -Xms2048M -Xmx2048M -jar "C:\Users\Ender\Desktop\Minecraft.exe"

The difference between java.exe and javaw.exe is that javaw.exe don't have console window attached to it.

With java.exe you get this little Java window everytime you open Minecraft, and it can get pretty annoying. You can use it for debugging though, with all this stuff, info etc.

I think you can also do it with launcher, using -cp instead of -jar, and net.minecraft.LauncherFrame, but I don't know if it still work in-game, or it only changes launcher setting without purpose.

Also, is your system 64-bit? I don't know if it's better, but I am using Java 7 instead of 6, and maybe it's placebo effect, but I think it works little bit better, so you could try it too.

By the way, my friend noticed, that Minecraft still don't want so much memory after all, because even with Sonic's Shader Mod, it was taking only 1.6 GB from 4 GB available.

I don't know if it's even worth to try all of this, when it probably won't change anything.

If you aren't using it already, I would recommend you OptiFine, that really works and helps with framerate and graphics.

http://www.minecraftforum.net/topic/249637-11-optifine-hd-a4-fps-boost-hd-textures-aa-af/

Related Solutions

Minecraft crashes after logging in: A fatal error has been detected by the Java Runtime Environment

Let's look at what is happening: Minecraft is trying to do something which returns 0xc0000005.

In ntstatus.h, a list of error code definitions, 0xc0000005 is STATUS_ACCESS_VIOLATION.

MSDN - Analyze Crashes to Find Security Vulnerabilities in Your Apps reports:

Access violation exceptions (STATUS_ACCESS_VIOLATION) are generated by modern processors when a memory access caused by an instruction or program execution does not satisfy certain conditions defined by the processor architecture or memory management unit structures.

So, we now know that Minecraft does something that causes invalid memory access.

But, what exactly is Minecraft doing?

j  org.lwjgl.opengl.WindowsContextImplementation.nCreate(Ljava/nio/ByteBuffer;Ljava/nio/IntBuffer;Ljava/nio/ByteBuffer;)Ljava/nio/ByteBuffer;+0
j  org.lwjgl.opengl.WindowsContextImplementation.create(Lorg/lwjgl/opengl/PeerInfo;Ljava/nio/IntBuffer;Ljava/nio/ByteBuffer;)Ljava/nio/ByteBuffer;+10
j  org.lwjgl.opengl.Context.<init>(Lorg/lwjgl/opengl/PeerInfo;Lorg/lwjgl/opengl/ContextAttribs;Lorg/lwjgl/opengl/Context;)V+104
j  org.lwjgl.opengl.Display.create(Lorg/lwjgl/opengl/PixelFormat;Lorg/lwjgl/opengl/Drawable;Lorg/lwjgl/opengl/ContextAttribs;)V+88

Here we see, Minecraft tries to allocate an OpenGL Device Context buffer in memory.

The thread mentioned by Ben Blank has a different stack trace and thus is irrelevant.

We first have to get more knowledge about your memory, which you gave:

I noticed that the command that the minecraft.jar file is being run with says that it can have up to 1024mb of ram. I only have ~500mb of ram, so it would be referencing pointers in an unknown location. I also notice a gl issue, which I'm not really sure how to fix.

Given that low amount of memory, I'm going to guess that your graphics card uses 128 MB shared memory which means that it uses RAM memory to operate. I'm guessing that your Windows uses another 100 MB. There is only 250 MB of memory remaining for Minecraft, and your page file.

Minecraft uses from 512 MB to 1 GB, consider that playing Minecraft will cause disk trashing.

VM Arguments:
jvm_args: -Xms512m -Xmx1024m

So, now, where does the problem lie?

"so it would be referencing pointers in an unknown location" -- no. Just because you tell it it's allowed to use 1024 MB doesn't mean it ignores allocation errors when it runs out of space and creates invalid addresses out of thin air to reference. For all I know it wouldn't even matter, Windows would just give it space in the page file. - Matthew Read

This comment on the question is not 100% correct, there are exceptions that don't use the page file.

Exactly, OpenGL Device Context buffers must be in RAM; the solution is to buy more RAM.

I doubt if 1 GB will do the job given that Minecraft can use up to 1 GB; better to be safe than sorry and get 2 GB to avoid future problems. This also makes sure you don't experience disk trashing to the page file, which can have a great impact on the performance...

Or well, I could be all wrong and it could be a driver problem. But seriously, 512 MB isn't enough...

Minecraft – How to set name in Minecraft offline WITH MCPatcher

java -Xms512m -Xmx1024m -cp "%APPDATA%.minecraft\bin*" -Djava.library.path="%APPDATA%.minecraft\bin\natives" net.minecraft.client.Minecraft "Insert Name Here"

You're almost there but it could not locate the main classes.

Try this:

@SET /P name here=name here=

@java -Xms512m -Xmx1024 -cp "%APPDATA%/.minecraft/bin/*" \

-Djava.library.path="%APPDATA%/.minecraft/bin/natives" \

net.minecraft.client.Minecraft %name here%