Unable to set heap size to 4gb in sun java application server pe 8.2

i have sun v890 machine with 32gb ram and solaris 10
i am running sun java system application server platform edition 8.2
when i am setting max heap size to 4GB
it is giving an error
Invalid maximum heap size -Xmx4096m
the specified size exceeds the maximum representable size
i want to know what i should do to increase this heap size.
also tell me if the JVM running is 64bit. if not how can i change it
to 64bit VM.

The maximum size for a 32-bit process on Solaris (any 32-bit process, not just Java) is 4GB, which includes the program text, thread stacks, and various other things in addition to the JVM heap. So the maximum heap you can expect to allocate for the appserver is about 3500MB.
SJSAS 8.2 does not support a 64-bit JVM; SJSAS 9.1 is needed for that. However, it's very rare that a Java EE application actually needs that much memory, and the 64-bit JVM has a performance penalty vs. the standard JVM. So more heap is probably not going to make your app run any better.

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If I then look at the linux server my process is running on, I may see a top screen like so:
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Peter Lawrey wrote:
user5287726 wrote:
Peter Lawrey wrote:
It will always reserve this much virtual memory, plus. In term of resident memory, even the minimum is not guarenteed to be used. The minimum specifies at what point it will make little effort to recycle memory. i.e. it grows to the minimum size freely, but a "Hello World" program still won't use the minimum size.No, Linux does not reserve virtual memory. Just Google "Linux memory overcommit". Out-of-the-box, every Linux distro I'm aware of will just keep returning virtual memory to processes until things fall apart and the kernel starts killing processes that are using lots of memory - like your database server, web server, or application-critical JVMs. You know - the very processes you built and deployed the machine to run. Just Google "Linux OOM killer".Thats not the behaviour I see. When I start a process which busy waits, but doesn't create any objects, the virtual memory sized used is based on the -mx option, not how much is used. Given virtual memeory is largely free, why would an OS only give virtual memory on an as needs basis.
Busy looping process which does nothing.
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I hope you will all forgive me because this has been exhausted although I followed all the advices.
After the following examples, to check my own environment. I have done the following:
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66650112
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import java.io.*;
import java.util.*;
import java.util.regex.*;
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public ArrayList<String> getRecords(String fileNameIn) throws IOException {
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}Message was edited by:
McTaar
Message was edited by:
McTaar

This is the error displayed:
java.lang.OutOfMemoryError: Java heap space
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     at java.util.Arrays.copyOf(Arrays.java:2734)
     at java.util.ArrayList.ensureCapacity(ArrayList.java:167)
     at java.util.ArrayList.add(ArrayList.java:351)
     at readFile.getRecords(readFile.java:41)
     at myMain.main(myMain.java:79)readFile: 41 is
dataFromFile.add(current);

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�
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How to Increase the memory size of a File in the Application Server

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Regards
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Hi,
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placing XML File in Appl. Server
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ELSE.
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ENDDO.
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at runtime i can see
it_mara --> contain 10 records
it_xmltab --> contain 7 lines (Each line size is 255 char). This table have XML format data, (unknow format , with all numeric
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it_xmltab is trasferred to application server , but the xml format is generated upto 4 records, and for the remaining records
the XML format is not generated.
the XML data in application server file is
<?xml version="1.0"?><TY_MARA><TY_MARA><MATNR Datatype="C" Length="36">0-BUY1</MATNR><MATKL Datatype="C" Length="18">012</MATKL><MEINS Datatype="C" Length="6">PC
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</TY_MARA><TY_MARA><MATNR Datatype="C" Length="36">0-BUY2</MATNR><MATKL Datatype="C" Length="18">012</MATKL><MEINS Datatype="C" Length="6">
PC </MEINS>
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JV

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