Any side effects on JRE/JVM when setting Desktop Heap Size?

In Win2003 we experience a limitation of about 70 java.exe's. By setting the Desktop Heap Size we can increase this limit to more than double. Link showing more info on Desktop Heap Size:
http://blogs.msdn.com/ntdebugging/archive/2007/01/04/desktop-heap-overview.aspx
Does this give any side effects to the running java.exe's?
Has anyone experimented with this?

Hi Bobo
It seems to be a bit small. I have close the same configuration like you and set the
maxMemory to 512 MB/server
Regards Ruedi :-)
Bob Krause schrieb:
Hello,
I have a customer that is running WLS 6.1 sp4 and they have set the JVM max memory
value to 64M on a Sun Solaris box with over 6 meg of memory and 4 CPUs.
We have an application on it that makes use of connection pooling, session objects,
over 30+ stateless session beans, and has 100-200 users connected to the application
for 4-8 hours at a time.
Does this value of 64M make any sense??? This is the default out of the box setting
that we have setup on our development PCs.
Also as a side note, can any point me in the direction of any formulas for the
calculation of this number and also the number of execute threads.
Thank you,
Bob

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Is there any side effect despite in 'sharing' when I change the computername in os x 10.6

Hi,
I'm not sure about any side effect if I change my computer's name (currently like 'first name last name MacbookPro'), e.g will time machine have any trouble with that? Would like to change to a shorter name.
Computer is in use since 2 years and everything works fine. Just tried to integrate sonos music system with my mac and have trouble sharing iTunes library with sonos. Therefore sonos support asked me to shorten the computers name and see if that helps.
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trimanu wrote:
will time machine have any trouble with that?
no.
you can safely change your computer's name as often as you like.

Hey guyz.. i wanna ask if i get an updated version from itunes when i plug my iPhone into the Pc, i get a letter tells me that there is an update for your iPhone ... i wanna ask is it safe to download ?? and does it make any side effects on longTerm using

hey guyz.. i wanna ask if i get an updated version from itunes when i plug my iPhone into the Pc, i get a letter tells me that there is an update for your iPhone ... i wanna ask is it safe to download ?? and does it make any side effects on longTerm using ??

It is safe to download if your phone is not jailbroken. Before you download it, however, take some precautions:
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Connect the phone cable to a USB port directly on the computer, not a hub
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Using Field Blend plug-in, any side effects?

Cutting an HDV show with lots of action. Camera may have had 'sharpen' mode set too high, but end result is that the action scenes show way too much of the 'interlace lines' in playback on an LCD screen. Distractingly so.
I used the Field Blend plug-in from Joe's Filters on the whole show, and get a very smooth looking clean result. No interlace lines on LCD screen.
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Is there some side-effect one has to deal with when using the Field Blend plug-in?
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Ben

Are there any side effects of munging two fields
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The show works fine on an NTSC monitor. But the client will be showing it on a lovely new laptop, and also projecting it in a large cinema theatre.
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Maybe Joe is doing something special with his plug-in?
B.

I have tryed the "find my ipod application" and i tried to lock it and it have been locked but i am using the ipod without any effects but if by time would be any side effects?

i have tryed the "find my ipod application" and i tried to lock it and it have been locked but i am using the ipod without any effects but if by time would be any side effects?

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How to set the heap size of JVM

please let me know that how to set the heap size of JVM

C:\>java -X
    -Xmixed           mixed mode execution (default)
    -Xint             interpreted mode execution only
    -Xbootclasspath:<directories and zip/jar files separated by ;>
                      set search path for bootstrap classes and resources
    -Xbootclasspath/a:<directories and zip/jar files separated by ;>
                      append to end of bootstrap class path
    -Xbootclasspath/p:<directories and zip/jar files separated by ;>
                      prepend in front of bootstrap class path
    -Xnoclassgc       disable class garbage collection
    -Xincgc           enable incremental garbage collection
    -Xbatch           disable background compilation
    -Xms<size>        set initial Java heap size
    -Xmx<size>        set maximum Java heap size
    -Xss<size>        set java thread stack size
    -Xprof            output cpu profiling data
    -Xrunhprof[:help]|[:<option>=<value>, ...]
                      perform JVMPI heap, cpu, or monitor profiling
    -Xdebug           enable remote debugging
    -Xfuture          enable strictest checks, anticipating future default
    -Xrs              reduce use of OS signals by Java/VM (see documentation)look at the -Xm? lines
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    -Xmx<size>        set maximum Java heap sizeThis can be used e.g. like this:java -Xms8M -Xmx32M MyProgwhich runs MyProg in a java VM with the initial heap size of 8 MB and a maximum heap size of 32 MB.
- Marcus

Setting the heap size

Hi all,
I wanted to ask you about setting the heap size value.
How we can calculate the heap size?
I had problems with the max heap size in my application.
So I increased the max value to 2048 MB, but I am afraid that
the same error may come up again some time depending upon the
usage.
So how I can find, say for a server having 2 GB RAM,
how much heap size I should give? I read that there is no defined
formula to calculate this. But I wanted to get the best way of doing it.
Please advise,
Sandeep

As has already been said, you probably have a leak. However, when trying to gauge the maximum heap you can (not should, but can) use you have to take into account what the server is doing, and its operating system. You do not want your JVM to page. So, for a 2GB server, with no other app on it, I think the "usual" is something like 75% max? Though I really wouldn't take my word for it...it's not my field.

How to set the heap size in adminstrative console

Hi All,
Please let me know how to increase heap size in weblogic Adminstrative console.
Regards
Madhu

The answer to this depends on whether you're trying to set the heap size for a manager server which is managed by NodeManager, or the admin server.
First click on "Lock and Edit".
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-Xmx1536m
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If, however, you're trying to set this on the admin server, you can't do this in the admin console at all. In that case, go into $DOMAIN_HOME/bin and edit the "setDomainEnv.{sh,cmd}" script (".sh" if on Unix/Linux, ".cmd" on Windows). Find the line that sets the "MEM_ARGS" variable, like the following on Windows:
set MEM_ARGS=-Xms256m -Xmx512m
Change this line to whatever you want, then restart the admin server.

Will killing pacman have any side effects?

Hi recently while doing an upgrade with pacman, the download of a package will stop and I will not get any feedback anymore. So I leave it for a few hours but nothing happens so I decided to ^C which I know will kill pacman. What bad side effects should I expect from doing this? and is anyone else having a similar problem with pacman?

shining wrote:
dav7 wrote:
moljac024 wrote:This is annoying, we had a topic about this. It seems that pacman just stops responding from time to time for some of us. Of course, there is no special way to reproduce it, so it's a tough bug.
Maybe pacman should be modified to support an option (for pacman.conf) that causes pacman to log a TON of debug info to eg /var/log/pacman-debug.log, and those that experience the issue can try the setting out. And by "ton" I mean... every 2nd line in pacman being a debug_print() call (or whatever)
Just an idea. I like ideas.
You mean like pacman --debug ?
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At least, I don't experience anything similar, and I am sure many other users as well.
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Should I just run pacman with --debug always ? I guess I could do that.

Upto how much I can set maximum Heap size for jvm?

I am running application on 8GB RAM Windows 64 bits machine.
I am running out of OutOfMemory (Heap Space). I want to increase the Heap Size for my jvm.
But can anybody please tell me what is the limit by which I can set the maximum size for heap?
Thanks in Advance,
Jenish

Max allowed memory per process is 2 raised to the 64th power. What maximum memory you can set depends on the memory available
for your application. You may be able to set more than 8GB ram then it will use the swap space and it will slow down your application
performance. So try different memory size and see which one works best for your application.

Is it possible to set the heap size limits in system-wide config?

Hi,
I am trying to set the JRE heap size limits (-Xms and -Xmx) by using the system-level deployment.properties file. The JRE version is 1.6 update 6.
Normally, I would have something like this in the user-level deployment.properties file:
deployment.javapi.jre.1.6.0_06.args=-Xms64M -Xmx192MHowever, when the same line is put in the system-level properties, it does not seem to have any effect. I have tried different options, also unsuccessfully:
javaplugin.vm.options=-Xms64M -Xmx192M
or
javaplugin.minHeapSize=64m
javaplugin.maxHeapSize=192mIs it not possible to address this setting via system-level properties at all? I am hoping that I will not have to resort to per-user config files.
Best regards,
Martin

Hi Michael,
thank you for your answer. I am sorry, I was unable to find the link to the message 10144001.
My ultimate goal would be setting the system level settings as opposed to settings per applet. I was unable to find any mentioning of "deployment.javapi.jre.X.X.X_XX.args" in the official documentation here: http://java.sun.com/j2se/1.5.0/docs/guide/deployment/deployment-guide/properties.html
Best regards,
Martin

Set the heap size

Hi,
I am wondering what's the default heap size if I don't add -ms -mx opation? I
set the two options and the following is the output from -verbosegc. what's it
means?
Thanks.
[GC 2598K->2145K(2696K), 0.0035829 secs]
[GC 2656K->2201K(2824K), 0.0036262 secs]
[Full GC 2713K->2070K(4028K), 0.1933980 secs]
[GC 2582K->2229K(4028K), 0.0046565 secs]
[GC 2741K->2373K(4028K), 0.0061002 secs]
[GC 2885K->2514K(4028K), 0.0064346 secs]
[GC 3026K->2656K(4028K), 0.0061670 secs]
[GC 3168K->2798K(4028K), 0.0054694 secs]
[GC 3310K->2940K(4028K), 0.0054521 secs]
[GC 3452K->3080K(4028K), 0.0058119 secs]
[GC 3592K->3216K(4028K), 0.0059069 secs]
[GC 3728K->3357K(4028K), 0.0057200 secs]
[GC 3869K->3496K(4028K), 0.0055719 secs]
[GC 4008K->3636K(4156K), 0.0057239 secs]
[Full GC 4148K->3649K(6544K), 0.3064887 secs]
[GC 4091K->3773K(6544K), 0.0412259 secs]
[GC 4285K->3912K(6544K), 0.0052336 secs]
[GC 4424K->4051K(6544K), 0.0055661 secs]
[GC 4563K->4189K(6544K), 0.0055543 secs]
[GC 4701K->4326K(6544K), 0.0055703 secs]
[GC 4838K->4464K(6544K), 0.0055915 secs]
[GC 4976K->4608K(6544K), 0.0059667 secs]
[GC 5120K->4746K(6544K), 0.0053261 secs]
[GC 5258K->4884K(6544K), 0.0053761 secs]
[GC 5396K->5023K(6544K), 0.0059290 secs]
[GC 5534K->5159K(6544K), 0.0054320 secs]
[GC 5671K->5301K(6544K), 0.0114341 secs]
[GC 5813K->5405K(6544K), 0.0103658 secs]
[GC 5917K->5492K(6544K), 0.0053194 secs]
[GC 6003K->5592K(6544K), 0.0107092 secs]
[GC 6104K->5694K(6544K), 0.0096887 secs]
[GC 6206K->5786K(6544K), 0.0037949 secs]
[GC 6298K->5890K(6544K), 0.0101172 secs]
[GC 6402K->5990K(6544K), 0.0041271 secs]
[GC 6502K->6097K(6672K), 0.0040678 secs]
[Full GC 6609K->6191K(10992K), 0.2664733 secs]
Tue Dec 04 15:22:10 PST 2001:<I> <T3Services> CacheManagerImpl: EMAIL TEMPLATE
C
ACHE STARTING
[GC 6849K->6361K(10992K), 0.0586387 secs]
Tue Dec 04 15:22:10 PST 2001:<I> <T3Services> CacheManagerImpl: SCHEDULE CACHE
S
TARTING
[GC 7129K->6530K(10992K), 0.0083019 secs]
[GC 7298K->6678K(10992K), 0.0058533 secs]
[GC 7446K->6807K(10992K), 0.0052940 secs]
[GC 7575K->6920K(10992K), 0.0048598 secs]

I think the default heap size is 16MB, as for the GC output:
these [GC 2598K->2145K(2696K), 0.0035829 secs]
show the collection of Objects within the eden area of the heap (Short lived Objects),
the heap size before GC was 2598K and after GC was 2145K and the time taken was
0.0035829 secs.
These outputs:
[Full GC 2713K->2070K(4028K), 0.1933980 secs]
show the details for a full GC, these are the ones to watch out for, they will
take longer and the JVM (no mater how many processors) will block during a full
GC....I.E no server response at all.
The smaller the heap size the more often a full GC will occur, however the larger
the heap, the longer the full GC will take.
One of the new options for jdk 1.3.1 is the -Xincgc option, this will do incremental
Garbage Collection, overall it will take longer than normal, but the individual
Full GCs will take less time....so the server is not hung for as long at any one
time.
Set -Xms (the minimum heap) to the same as -Xmx (max heap), this increases performance
as the JVM does not have to repeatedly assign more memory to the heap.
Gareth
"Jen" <[email protected]> wrote:
>
Hi,
I am wondering what's the default heap size if I don't add -ms -mx opation?
I
set the two options and the following is the output from -verbosegc.
what's it
means?
Thanks.
[GC 2598K->2145K(2696K), 0.0035829 secs]
[GC 2656K->2201K(2824K), 0.0036262 secs]
[Full GC 2713K->2070K(4028K), 0.1933980 secs]
[GC 2582K->2229K(4028K), 0.0046565 secs]
[GC 2741K->2373K(4028K), 0.0061002 secs]
[GC 2885K->2514K(4028K), 0.0064346 secs]
[GC 3026K->2656K(4028K), 0.0061670 secs]
[GC 3168K->2798K(4028K), 0.0054694 secs]
[GC 3310K->2940K(4028K), 0.0054521 secs]
[GC 3452K->3080K(4028K), 0.0058119 secs]
[GC 3592K->3216K(4028K), 0.0059069 secs]
[GC 3728K->3357K(4028K), 0.0057200 secs]
[GC 3869K->3496K(4028K), 0.0055719 secs]
[GC 4008K->3636K(4156K), 0.0057239 secs]
[Full GC 4148K->3649K(6544K), 0.3064887 secs]
[GC 4091K->3773K(6544K), 0.0412259 secs]
[GC 4285K->3912K(6544K), 0.0052336 secs]
[GC 4424K->4051K(6544K), 0.0055661 secs]
[GC 4563K->4189K(6544K), 0.0055543 secs]
[GC 4701K->4326K(6544K), 0.0055703 secs]
[GC 4838K->4464K(6544K), 0.0055915 secs]
[GC 4976K->4608K(6544K), 0.0059667 secs]
[GC 5120K->4746K(6544K), 0.0053261 secs]
[GC 5258K->4884K(6544K), 0.0053761 secs]
[GC 5396K->5023K(6544K), 0.0059290 secs]
[GC 5534K->5159K(6544K), 0.0054320 secs]
[GC 5671K->5301K(6544K), 0.0114341 secs]
[GC 5813K->5405K(6544K), 0.0103658 secs]
[GC 5917K->5492K(6544K), 0.0053194 secs]
[GC 6003K->5592K(6544K), 0.0107092 secs]
[GC 6104K->5694K(6544K), 0.0096887 secs]
[GC 6206K->5786K(6544K), 0.0037949 secs]
[GC 6298K->5890K(6544K), 0.0101172 secs]
[GC 6402K->5990K(6544K), 0.0041271 secs]
[GC 6502K->6097K(6672K), 0.0040678 secs]
[Full GC 6609K->6191K(10992K), 0.2664733 secs]
Tue Dec 04 15:22:10 PST 2001:<I> <T3Services> CacheManagerImpl: EMAIL
TEMPLATE
C
ACHE STARTING
[GC 6849K->6361K(10992K), 0.0586387 secs]
Tue Dec 04 15:22:10 PST 2001:<I> <T3Services> CacheManagerImpl: SCHEDULE
CACHE
S
TARTING
[GC 7129K->6530K(10992K), 0.0083019 secs]
[GC 7298K->6678K(10992K), 0.0058533 secs]
[GC 7446K->6807K(10992K), 0.0052940 secs]
[GC 7575K->6920K(10992K), 0.0048598 secs]

Setting memory heap size

Hi,
I would like to know how to set the default memory
heap size to 128 MB while installing the Java Plugin
itself.
Is there any environment variable available for setting
this?
I dont want to use the Control Panel option for setting
it.
Thanks for your help.

Hey i have the same issue, how did you solve it?
Hi Gkumarc1,
Plugin 1.3.0 (and after) reads the property filein
.java directory of user's home directory. Java
runtime parameter is saved in the property file.Here
is an example of it:
# Java(TM) Plug-in Properties
# DO NOT EDIT THIS FILE. It is machine generated.
# Use the Activator Control Panel to editproperties.
javaplugin.jre.params=-Xmx 128m
Hope this helps.
Sun-DTSIs there a way to set the default heap size on the
fly? Meaning, we want to avoid the need for our
customers to go into their control panel and make
this setting. Instead, we would like to have the
applet load with our preferred default VM size. This
would allow us to change the preferred size during
some future performance enchancements without having
to contact all of our 2,000+ external customers. Is
there something that can be put in the PARAM tag
within the HTML that specifies the
preferred/recommended default size?
Any help would be greatly appreciated.

Does the jvm allocate complete max heap size initially?

Does the JVM allocate the memory for the entire max heap size up front, or does it start with the specified minimum size and increase and grab more later if needed?
The reason this is being posted is because we have a number of jboss servers that are being run. Some don't require large heap sizes, others do. If we use the same large max heap size for all would all the memory get allocated up front, or possibly a smaller initialization portion?

I have done the test with Solaris, Linux and WinXP.
Test with -Xms512M
Have written a simple java program to which the minimum heap size was set to -Xms512m then the program was executed on Solaris and WinXP platforms. The usage of memory of the Java process was 6 MB in WinXP and 9 MB in Solaris, rather than 512 MB. The JVM is not allocating the configured minimum size of 512 MB at the start of the process execution.
Reason:
If you ask the OS for 512 MB it'll say "here it is", but pages won't actually be allocated until your app actually touches them.
If the allocation is not being made initially during the start of the process, the concept of minimum heap size is not required.
But the garbage collection log shows the minimum heap size as what was configured using -Xms option.
Test with -Xms1024M
The JVM arguments was set to : -Xms1024m -Xmx1024m, but the used memory observed using Windows perfmon was 573M.
6.524: [Full GC 6.524: [Tenured: 3081K->10565K(967936K), 0.1949291 secs] 52479K->10565K(1040512K), [Perm : 12287K->12287K(12288K)], 0.1950893 secs] Reason:
Optimization is something that the operating systems do. The JVM allocates the memory in it's address space and initializes all data structures to your -Xms. In any way that the JVM can measure, the allocation from the OS is complete. But the OS doesn't physically assign a page to the app until the first store instruction. Almost all modern OSs do this.
Hope this is helpful.

How to set max-heap-size outside the jnlp file?

Due to bug_id=6631056 It may not be possible to specify max-heap-size within
the JNLP file for certain jnlp java applications.
Are there other possibilities to specify this Jvm parameter?
In the ControlPanel there is the possibility to specify Xmx for applets but not for jnlp.
I have tried to add properties like
"deployment.javaws.jre.0.args=Xmx\=128M" without success
Many thanks

Even in JNLP also you can specify the max heap size
<j2se version="1.5+" initial-heap-size="128m" max-heap-size="512m"/>
Thanks,
Suresh
[http://sureshdevi.co.in|http://sureshdevi.co.in]

Any side effects on JRE/JVM when setting Desktop Heap Size?

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