Too many resources used under Linux

I have tested sun jvm under linux red-dat 6.2
and 7.1 (listed by Sun as official platform supported)
The JVM I test was from 1.3.0 to the 1.4.1
I have written a simple application server that
runs java application starting a new JVM.
When the java application runs (with the -server or
-hotspot option) I see that 10 java process are
istantiated. (10 JVM)
This is a real problem because for 4 users that runs 4
applications there are 40 JVM running
(each one allocates about 20 Mb of memory)
and the system became very slow.
With the -classic option the situation is better: only 1 JVM
for application is started, (the application is the same, I
have change only the -server option with -classic)
but JVM seems to be less stable: I have a lot of segmentation
fault errors. (with core dump)
With the new distribution of Sun JVM (1.4.1) the -classic option
is no longer supported.
Does anyone knows if is there a way to have only one JVM
for application? (-classic does not works well)
Is there others JVM for linux more stable instead of the Sun one?
PS: I have tested the same code under win/2000 using JVM 1.3.1_03
and the -classic option. All goes well (the same application):
I haver only 1 thread for application without jvm runtime error.
Now my doubt is: does Sun belive in the Linux Word?
JVM for Windows is much more stable!!!
Thank you in advanced and best regards.

I am assuming that you believe that there are 10 processes because that is what ps shows. However on Linux, each thread in a java program shows up in ps as a separate process. The memory for each "ps process" corresponding to a java thread is shared among all the threads of the JVM. Therefore if you see 10 processes with 20MB each you are not using 200MB, just 20.
If you are running 4 JVMs then you would be using 40MB not 800 as shown in ps.
I think Sun's JVM for linux is quite good (as I use it every day). If you need to run so many JVMs you should invest in more memory.
BTW, How much memory is installed in your system?

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do I Need to reinstall Lion? I am losing my mind trying to fix this.

mdworker is part of Spotlight indexing. Spotlight as in Commnad-Space or the magnifying glass in the upper right corner of your menu bar.
You can control Spotlight via System Preferences -> Spotlight
Message was edited by: BobHarris

"java.io.IOException: Too many open files" in LinuX

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package forums.crap;
import java.io.*;
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Hello.
I looked through the older web sites of IBM regarding the usage of JCOP tools under Linux.
I am interested in following questions:
1. Is there any separate distributon version of JCOP tools for Linux?
2. Can sample JCOP tools 3.1.2 plugin (for Windows) be used under Linux. What has to be modified? Also what additional tools have to be installed an used for communication with real cards through PC/SC readers.
3. Is JCOP simulation option available under Linux?
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newbie2007 wrote:Hello.
I looked through the older web sites of IBM regarding the usage of JCOP tools under Linux.
I am interested in following questions:
1. Is there any separate distributon version of JCOP tools for Linux?
2. Can sample JCOP tools 3.1.2 plugin (for Windows) be used under Linux. What has to be modified? Also what additional tools have to be installed an used for communication with real cards through PC/SC readers.
3. Is JCOP simulation option available under Linux?
I'll appreciate any help.
Best regards,
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2. Prior to JCOP Tools 3.1.2 the last time something was mentioned about Linux was in the release notes of 3.1.1b . In version 3.2.0 IBM added a linux_support page to the JCOP Tools user guide (see release notes and linux_support page below).
3. There shouldn't be any problems with the generic simulation. The target pack runs only with Windows though.
h1. Release Notes
h2. Version
JCOP Tools 3.1.1.b (Bärlach)
h2. What's new?
h3. 3.1.1.b
<ul><li>New simulation (fixed static obj/arr bug, fixed instance field token bug).</li>
<li>Applet privileges can now be specified in the launch configuration dialog.</li>
<li>The "exportmap" feature is now available.</li>
<li>The JCOP Performance Test Demo ("JCOP Factor") is now included.</li>
<li>Minor bug fixes.</li>
</ul>
h2. Known problems
<ul><li>Simulations do not run (Linux, MacOS X)
     The Eclipse update manager does not set the execute permission bits for the simulations. You need to manually <code>chmod 755</code> those files in ECLIPSE/plugins/com.ibm.bluez.jcop.eclipse_3.1.1.x/simuls/
</li>
<li>PC/SC Support (Linux)
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</li>
</ul>
h2. Frequently Asked Questions
Please refer to the online FAQ at http://www.zurich.ibm.com/jcop/download/eclipse/faq/.
h2. Bug Reports
Please send bug reports to [email protected]. Make sure you include the following:
<ul><li>Problem description</li>
<li>Steps to reproduce</li>
<li>Eclipse version and build number (Help > About)</li>
<li>JCOP Tools version (Help > About; click on BlueZ icon)</li>
</ul>
h2. Using JCOP Tools with Linux (>= 3.2.0)
h3. ___
Overview
The current JCOP Tools release now also offer a version for the popular Linux
operating system. Both the Windows and Linux verson provide more or less the same
functionality, and JCOP application development can thus fully succeed on Linux systems.
Nevertheless, installation of the JCOP Tools differ between Windows and Linux
where the Linux version does not provide a simple installer as in case of Windows.
Additionally, the Linux version expects a properly setup Muscle PCSC installation
as soon as you want to use them together with physical, real cards. As Muscle
PCSC is still not shipped with most Linux distributions, you must download and
install them separately from the JCOP Tools.
h3. ___
Contents
h3. ___
Software Requirements
Linux distribution
The JCOP Tools simulation has been developed on a Fedora Core 6 system, but should also work in case of
many other recent Linux distributions.
Java Development Kit
The JCOP Tools have been developed and tested with the Sun JDK 1.4.2_13-b06
for Linux. Your success with other Development Kits may vary as there are
partly subtle differences across the different devlopment kits.
PCSC
The JCOP Tools use PCSC to talk with real cards on Linux. Most distributions
do not ship with Linux PCSC by default (Fedora Core 6 does), you must thus download it fromhttp://www.linuxnet.com
and install it by yourself. If you are used to software installation under Linux,
and are not afraid of compiling and installing software packages, this should
not be a hard problem. You have to download both the base PCSC package
(including PCSC daemon and client libraries) and separately the driver
for the reader you want to use. The PCSC package contains a test program
which should tell you whether your installation is set up correctly and
communicating with a card works. The JCOP Tools have been reported to
work together with Muscle PCSC version 1.3.1-7.
JPCSC
The JCOP Tools are shipped with JPCSC which you can also download athttp://www.linuxnet.com. JPCSC
is a JNI library which offers Java applications the access to PC/SC functions
by mapping their requests to an underlying native PC/SC implementation. The JCOP
Tools - mostly written in Java - thus depend on JPCSC to communicate with real cards
on Linux. JPCSC depends on a properly installed and setup PC/SC environment.
Especially, the JAVA_LIBRARY_PATH should list the directories where the
PC/SC client libraries and the native JPCSC library libjpcsc.so ( downloadable as binary from
Windows Binary Download Here )
are installed, the CLASSPATH variable should list th___
Miscellaneous
What should work
As soon as you setup your system correctly, there should only be minor differences
between using JCOP Tools on Windows or on Linux. Emulating a real JCOP,
debugging, shell, cap-file conersion should all be possible as in case of Windows.
What is missing
No drivers or tools are currently available for using JCOP30's in contactless
mode. If you need such support, please contact directly NXP
at for further assistance.
Copyright 2001,2007 IBM Corp. All rights reserved.
Edited by: lexdabear on Sep 28, 2007 4:13 PM (I hate the new edit)

We have too many apple devices, how can I creat another apple ID and divide the devices among 2 Apple Ids?

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HT1420 I'm trying to authorize a new computer with an itune account, but my the computer statea that I have too many devices authorized. I only have 2 computers in my possession now. How can I deauthorize computer I don't have anymore without deauthorizin

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You should also alwasy have a backup copy.
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You have the only answer there is.

VISACOM - Alloc Error using 488.2 USB-B Interface - too many open sessions

I have been having the following issue in my VB .NET RF-ATE application.... It usually happens when my program enters a measurement loop (I.E. searching for P1dB). It begins to solve for P1dB and performs about 15 cycles (sets power level on SigGen and takes SpecAn meas) and then crashes due to the following error :
As Logged in the Event Viewer :
VISA: May 13 09:45:22: Error=bfff003c,"VI_ERROR_ALLOC: Insufficient system resources/memory": ViTable::add - too many open sessions
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An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in RFATE.exe
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Another odd thing to note is that I have created testplan scripts and loaded them into my application with literally hundreds of measurement commands and my program didn't crash then???
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Attachments:
GPIB.txt ‏3 KB

Just posting a followup... Turns out I found a way to make it work! (I have been fighting this for almost 3 days!).
If you look at the variable declarations of my procedure.....
Sub GPIB(ByVal Addr As Object, ByRef Data As Object, ByVal IO As String)
Dim ioMgr As Ivi.Visa.Interop.ResourceManager
Dim instrument As Ivi.Visa.Interop.FormattedIO488
Dim session As Ivi.Visa.Interop.IMessage
I use the "IMessage" interface for the variable session.
Just before the "Sub End" is executed I use the following line to close the session :
session.Close
Which it would appear doesn't close the session properly when you use the "IMessage" interface.
So I changed the line to use the "IVisaSession" interface instead :
Dim session As Ivi.Visa.Interop.IVisaSession
Now when the Close method is executed aparently it closes the session properly because my program isn't crashing at all!
I was using VISA COM 3.0 Reference object (GlobMgr.dll).
If anyone has any insight on this please do share.

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