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Geek Culture / How do I find out how much RAM is available, then set it as a variable?

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The Zombie Killer
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Posted: 5th Feb 2012 09:12
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Hey guys,
I'm just trying to find out how I can, at the DOS prompt, find out how much memory my computer has in megabytes, then set it as a variable, for example:
echo off
cls
findoutram /var pcram
echo %pcram%

which would output something like 2048.
Any help would be appreciated.

-TZK

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BatVink
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Posted: 5th Feb 2012 09:44
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It's a tough one ...

MEM

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The Zombie Killer
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Posted: 5th Feb 2012 10:04
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@batvink
I am aware of that command, but I am using win7, and win7 doesn't have that command, also I want to write the result in megabytes to a variable.

-TZK

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Isocadia
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Posted: 5th Feb 2012 10:27
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If you want megabytes and have bytes, divide by 1024/1024
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The Zombie Killer
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Posted: 5th Feb 2012 10:41
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@Isocadia
The problem is, I don't have the mem command, and the mem command doesn't write the memory amount to a variable.
If anyone wants to know I'm trying to do this:
java -Xmx%pcram%M -Xms%pcram%M -cp "%cd%\mupdata\mclogo.jar";"%cd%\minecraft.jar"

It speeds up minecraft HEAPS when it uses the full memory amount, using this method also launches MC in 64bit java if you have it installed.

-TZK

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Diggsey
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Posted: 5th Feb 2012 21:26
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Uh, you do realise that you can never set it to use the "full" memory amount. A significant fraction of memory will always be required by the OS just to keep track of the rest of the memory, then you have to take into account all the other processes on your system which all use memory. If java tries to use all the memory you've given it, the OS will have to constantly page out parts of the memory to disk (very slow) so that it can pretend that you actually have more memory than you do.

[b]
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BatVink
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Posted: 5th Feb 2012 21:32
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Quote: "I am aware of that command, but I am using win7, and win7 doesn't have that command"


I ran that test on Win 7, it worked fine here. But as Diggsey says, there's more to it than that. If you fiddle with the memory rather than use the configuration provided by the developer you run the risk of garbage collection issues, and especially a Stop The World gc.

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bitJericho
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Posted: 5th Feb 2012 21:48 Edited at: 5th Feb 2012 21:54
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win7 x64 doesn't have that command.

You could always write a program to output the available memory to the command line.

You're better off manually tuning it though.

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The Zombie Killer
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Posted: 6th Feb 2012 07:17
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@Diggsey
I thought about that for a bit today, and decided that I can just make it output available memory instead of the max.

-TZK

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