-Xmx---m getting smaller and smaller

java-programmer, -Xmx---m getting smaller and smaller Hi,

I have Windows XP SP3 with 4GB memory (I know Windows only allows apps to use
about 3.25GB.) I have no applications running. I ran System Mechanic 7 to
defrag the memory with the result of the largest contiguous block of memory
being 2.74GB.

However, everytime I started Eclipse 3.3.2, the JRE 1.6.0_04 JVM terminated
with a -1 code. I started at -Xmx1024m and continually decremented until I
reached -Xmx600m when Eclipse started okay. This morning I was running
Eclipse with -Xmx900m okay.

The only changes I made were to (1) set the system variable JAVA_HOME to
reference JDK 1.6.0_04 and replaced java.exe, javaw.exe, javaws.exe in c:
\WINDOW\System32\ with the JRE 1.6.0_04 files. They were 1.4.2_07.

Does anyone have any idea why the JVM terminates because of not enough memory
when there is more than enough contiguous memory? This is really
frustrating.

Thank you,
Don

java-programmer >> -Xmx---m getting smaller and smaller The question is how many plug-ins do you have installed? You might run out of
space to load the classes. BIRT is know to do that to you.

Don Leckie wrote:
>Hi,
>
>I have Windows XP SP3 with 4GB memory (I know Windows only allows apps to use
>about 3.25GB.) I have no applications running. I ran System Mechanic 7 to
>defrag the memory with the result of the largest contiguous block of memory
>being 2.74GB.
>
>However, everytime I started Eclipse 3.3.2, the JRE 1.6.0_04 JVM terminated
>with a -1 code. I started at -Xmx1024m and continually decremented until I
>reached -Xmx600m when Eclipse started okay. This morning I was running
>Eclipse with -Xmx900m okay.
>
>The only changes I made were to (1) set the system variable JAVA_HOME to
>reference JDK 1.6.0_04 and replaced java.exe, javaw.exe, javaws.exe in c:
>\WINDOW\System32\ with the JRE 1.6.0_04 files. They were 1.4.2_07.
>
>Does anyone have any idea why the JVM terminates because of not enough memory
>when there is more than enough contiguous memory? This is really
>frustrating.
>
>Thank you,
>Don

--
Daniel @ [www.littletutorials.com]
Language is froth on the surface of thought

java-programmer >> -Xmx---m getting smaller and smaller Don Leckie wrote:

>
> Does anyone have any idea why the JVM terminates because of not enough memory
> when there is more than enough contiguous memory? This is really
> frustrating.

This might be obvious but when was the last time you did a full virus
and malware scan with a good, up-to-date scanner?

java-programmer >> -Xmx---m getting smaller and smaller On Sun, 25 May 2008 05:47:25 +0000, danielstoner wrote:

>>Does anyone have any idea why the JVM terminates because of not enough
>>memory when there is more than enough contiguous memory? This is really
>>frustrating.

Does the memory really need to be contiguous under Windows? Why? With
paging of memory I didn't even know that such a thing really existed
anymore.

Page table anyone?

--
Kenneth P. Turvey <email***@***.com>
http://www.electricsenator.net

/"\
\ / ASCII RIBBON CAMPAIGN
X AGAINST HTML MAIL AND NEWS
/ \

java-programmer >> -Xmx---m getting smaller and smaller Mark Space <email***@***.com> wrote in
news:Du7_j.6086$email***@***.com:

> Don Leckie wrote:
>
>>
>> Does anyone have any idea why the JVM terminates because of not enough
>> memory when there is more than enough contiguous memory? This is
>> really frustrating.
>
> This might be obvious but when was the last time you did a full virus
> and malware scan with a good, up-to-date scanner?

Thank you for your suggestion. I have McAffe AntiVirus with automatic
updates. It's always turned on. I do a full deep scan twice a week.

Thank you,
Don

java-programmer >> -Xmx---m getting smaller and smaller "danielstoner" <u43811@uwe> wrote in news:84aa502e4704c@uwe:

> The question is how many plug-ins do you have installed? You might run
> out of space to load the classes. BIRT is know to do that to you.
>
> Don Leckie wrote:
>>Hi,
>>
>>I have Windows XP SP3 with 4GB memory (I know Windows only allows apps
>>to use about 3.25GB.) I have no applications running. I ran System
>>Mechanic 7 to defrag the memory with the result of the largest
>>contiguous block of memory being 2.74GB.
>>
>>However, everytime I started Eclipse 3.3.2, the JRE 1.6.0_04 JVM
>>terminated with a -1 code. I started at -Xmx1024m and continually
>>decremented until I reached -Xmx600m when Eclipse started okay. This
>>morning I was running Eclipse with -Xmx900m okay.
>>
>>The only changes I made were to (1) set the system variable JAVA_HOME to
>>reference JDK 1.6.0_04 and replaced java.exe, javaw.exe, javaws.exe in
>>c: \WINDOW\System32\ with the JRE 1.6.0_04 files. They were 1.4.2_07.
>>
>>Does anyone have any idea why the JVM terminates because of not enough
>>memory when there is more than enough contiguous memory? This is really
>>frustrating.
>>
>>Thank you,
>>Don
>

Thank you for your suggestion. Just the standard plug-ins for basic
Eclipse plus emf-sdo-xsd and Subclipse.

The JVM terminates immediately before Eclipse can be run. Eclipse.exe
starts the JVM and then the Eclipse Java classes run in the JVM.

Thank you,
Don

java-programmer >> -Xmx---m getting smaller and smaller "Kenneth P. Turvey" <email***@***.com> wrote in news:48390e15$0
$2953$email***@***.com:

> On Sun, 25 May 2008 05:47:25 +0000, danielstoner wrote:
>
>>>Does anyone have any idea why the JVM terminates because of not enough
>>>memory when there is more than enough contiguous memory? This is really
>>>frustrating.
>
> Does the memory really need to be contiguous under Windows? Why? With
> paging of memory I didn't even know that such a thing really existed
> anymore.
>
> Page table anyone?
>

Yes. Google finds a lot of discussion about this. For years this has been
one of the biggest complaints to Sun.

BTW - From what I have read, Windows allocates memory to the JVM as more heap
space is needed when -Xms and -Xmx are NOT equal. However, when -Xms and -
Xmx are equal, Windows will allocate all the memory for the Xmx heap.

Thank you,
Don

java-programmer >> -Xmx---m getting smaller and smaller On Sat, 24 May 2008 21:02:47 -0500, Don Leckie <email***@***.com>
wrote, quoted or indirectly quoted someone who said :

> I started at -Xmx1024m

-Xmx10m means set the maximum Java heap size, in megabytes.

Java needs a lot more space than just the heap. It needs all its
native code, stackspace, disk cache ....
--

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com