JVM and 2BG limited physical memory
[205 byte] By [tuchicolatinoa] at [2007-11-27 6:33:51] 
Hello, my server has 4 BG of RAM. I use jconsole and it notices me I have only 2 GB. Is it a limit of JVM? Can I config JVM to detect and use my 4 GB?I hope someone can help me. Thanks
# 1
What platform? The 32-bit VM is limited to a theoretical (4G - 1) bytes.YoGeea at 2007-7-12 17:59:53 >
# 2
Operative System: Windows 2003You can see an screenshot of my jconsole: http://www.jcabello.es/screenshot.jpgtuchicolatinoa at 2007-7-12 17:59:53 >
# 3
Depending on what other libraries get loaded the 32-bit vm is limited to around 1.3 GB on windows.You only have 2 GB of physical memory, you don't want the heap going into swap space.YoGeea at 2007-7-12 17:59:53 >
# 4
No, the problem is the jconsole says: "2 GB of physical memory" and my server has 4 GB :-(Is JVM not using my complete RAM memory?And how can I know if my libraries are limiting my JVM?tuchicolatinoa at 2007-7-12 17:59:53 >
# 5
Its a limitation you have on 32bit OSs such as your windows. On Solaris for instance with a 32bit Java process you can get ~4GB of memory space.WoodyWoody.Benotya at 2007-7-12 17:59:53 >
# 6
> No, the problem is the jconsole says: "2 GB of
> physical memory" and my server has 4 GB :-(
>
> Is JVM not using my complete RAM memory?
>
> And how can I know if my libraries are limiting my
> JVM?
And so what possible difference does it make?
As stated above the limit with the 32 bit Sun VM is 1.4 gigs. So even if it said 4 gigs you still couldn't use it.
jschella at 2007-7-12 17:59:53 >
# 7
The problem is when I execute several times the JVM at same time. My software is running in a server and maybe my applications can磘 use more than 2 GB (together).Thanks :-)tuchicolatinoa at 2007-7-12 17:59:53 >
# 8
> The problem is when I execute several times the JVM
> at same time. My software is running in a server and
> maybe my applications can磘 use more than 2 GB
> (together).
Nope.
Each application is mapped into the application address space.
Thus each VM will have 1.4 gigs available. The physical memory will impact how much swapping occurs.
jschella at 2007-7-12 17:59:53 >
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