Speed up operation of write to file VI

I have a daq situation where an analog input is wired to my PC. I have a labview circuit which has the daq assistant connected to the "Enable" input of the "write to file" VI. The "elapsed time" vi is connected to the signal input. When the input signal is greater than a value it enables the write to file and the time is recorded. The problem is that the input must be "greater than" for about a second, i need this time to be much lower # .1 of a second. Is this possible?

The sample rate of your data acquisition system, will affect how regularly you can check the "greater than" condition. You need to increase the sample rate of your system, either by adjusting the hardware timing of your DAQ card or by changing any software delays you have.
I've written a quick example VI, which I believe is similar to yours. I have set the DAQ assistant to acquire data samples 50 times a second. If your input is greater than the set value during one of these samples the elapsed time will be logged.
Attachments:
logger.vi ‏305 KB

Similar Messages

The first binary file write operation for a new file takes progressively longer.

I have an application in which I am acquiring analog data from multiple
PXI-6031E DAQ boards and then writing that data to FireWire hard disks
over an extended time period (14 days). I am using a PXI-8145RT
controller, a PXI-8252 FireWire interface board and compatible FireWire
hard drive enclosures. When I start acquiring data to an empty
hard disk, creating files on the fly as well as the actual file I/O
operations are both very quick. As the number of files on the
hard drive increases, it begins to take considerably longer to complete
the first write to a new binary file. After the first write,
subsequent writes of the same data size to that same file are very
fast. It is only the first write operation to a new file that
takes progressively longer. To clarify, it currently takes 1 to 2
milliseconds to complete the first binary write of a new file when the
hard drive is almost empty. After writing 32, 150 MByte files,
the first binary write to file 33 takes about 5 seconds! This
behavior is repeatable and continues to get worse as the number of
files increases. I am using the FAT32 file system, required for
the Real-Time controller, and 80GB laptop hard drives. The
system works flawlessly until asked to create a new file and write the
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The requirements for this data acquisition system do not allow for a
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Any help or suggestions as to why I am seeing this behavior would be
greatly appreciated.

I am experiencing the same problem. Our program periodically monitors data and eventually save it for post-processing. While it's searching for suitable data, it creates one file for every channel (32 in total) and starts streaming data to these files. If it finds data is not suitable, it deletes the files and creates new ones.
On our lab, we tested the program on windows and then on RT and we did not find any problems.
Unfortunately when it was time to install the PXI on field (an electromechanic shovel on a copper mine) and test it, we've come to find that saving was taking to long and the program screwed up. Specifically when creating files (I.E. "New File" function). It could take 5 or more seconds to create a single file.
As you can see, field startup failed and we will have to modify our programs to workaround this problem and return next week to try again, with the additional time and cost involved. Not to talk about the bad image we are giving to our costumer.
I really like labview, but I am particularly upset beacuse of this problem. LV RT is supposed to run as if it was LV win32, with the obvious and expected differences, but a developer can not expect things like this to happen. I remember a few months ago I had another problem: on RT Time/Date function gives a wrong value as your program runs, when using timed loops. Can you expect something like that when evaluating your development platform? Fortunately, we found the problem before giving the system to our costumer and there was a relatively easy workaround. Unfortunately, now we had to hit the wall to find the problem.
On this particular problem I also found that it gets worse when there are more files on the directory. Create a new dir every N hours? I really think that's not a solution. I would not expect this answer from NI.
I would really appreciate someone from NI to give us a technical explanation about why this problem happens and not just "trial and error" "solutions".
By the way, we are using a PXI RT controller with the solid-state drive option.
Thank you.
Daniel R.
Message Edited by Daniel_Chile on 06-29-2006 03:05 PM

IO Operation (read/write files) in IPAD AIR downgrade ~50% than the one in IPAD4

Summary:
UnZip the same file with the same native unzip method (native zlib) in IOS7, ipad air take +50% more time consumption than the one in iPAD4.
for unZip, it main perform the IO read/write files in ipad, does apple air already changes the file system ?
Steps to Reproduce:
UnZIP a file with native zlip on both ipad AIR and IPAD 4 :
IPAD AIR: 16GB
IPAD 4: 16GB
ZIP file size: 700KB
Files in zip file: 225 files (120 files are images)
after remove the images, the time on IPAD AIR will save 50% time consumption
unZip method: the native zlib
unzip time on IPAD AIR+ IOS7: ~1200ms
unzip time on IPAD 4+ IOS7: ~800ms
Expected Results:
The unzip time should be almost the same on IPAD AIR and IPAD4.
Actual Results:
For same IO operation read/write file, IPAD AIR gets the 50% downgrade performance than the one in IPAD4
Version:
IPAD4: 16GB WIFI + IOS7
IPAD AIR: 16GB WIFI + IOS7
does anyone else encounter the same problem ?
A bug already submitted for apple: https://devforums.apple.com/message/993060

I even tried porting the code to Gumbo and running it there - still, no fonts are being enumerated.
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An SWF that contains a textfield with embedded fonts, when launched by itself succeeds to return the embedded font using Font.enumerateFonts(false), however when loaded using Loader.loadBytes into AIR, it fails to see those fonts even though the textfield in it is displayed and editable.
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Binary write to file slowing down my program

I have noticed this more on some types of computers, but I have two threads going. One that captures 10MB images and queues them, and another thread that dequeues them and appends to a binary file.
If I disable the write to file, program chugs along well. Once enabled, I noticed that the image capturing begins to act sluggishly, almost in sync with the writing to hard drive. I have tried changing the write loop priority to the lowest as well.
It isn't holding up at the queue/dequeue step either. Any pointers on what to try? I'm almost certain that there is a memory sharing issue where one process is writing to 10MB image to memory, while the other is reading a 10MB image from memory, and this is tying things up.

dre99gsx wrote:
The main VI which hosts both of these loops is setup as User Interface
There's the problem, I think. The user interface subsystem is special - it's a single thread. This is required for certain things (interactions with the operating system and user interface, some external DLLs and ActiveX components) that require a single thread. In general, don't run your code in the user interface system unless you have a specific reason to run it there. As an example, property nodes that refer to front-panel items cause a switch to the user interface thread, so if you have VI that uses a lot of references to update the front panel, that VI should run in the UI system. In your case, if you switch your main VI to Standard and leave the subVIs set as Same as Caller, I think you'll see a similar speed improvement. There's more information about LabVIEW threading here, although that information is slightly out of date; if I remember correctly (couldn't find the reference in a quick search) LabVIEW now allocates as many threads per system as there are processor cores in your CPU, but not less than 4 per execution system with the exception of the user interface.

Operating system command in file adaptor

Hi,
I am doing file to Idoc scenario, can i use the Operating system command in file adaptor to compress the file at FTP server and decompress the file at IE. I dont know is it possible and if yes then how or is there any other way to handle the big files as the network speed is very low.
Any clues!!!!!!!!!!!
Thanks in advance
Regards
Swatantra

Have a look into these threads - they seem to have the solution u need (i havnt tried it though)
Unzip file using operating system command in file/ftp receiver adapter
How to zip and unzip xml files dynamically by XI

File Read and Write using File Adapter in Bpel

In Bpel Process i am using File Adapter ( Schema is Opaque) for read and write the file contents. i am able do successful deployment and read, write function in first time deployment, after that again i tired to run the application, its not going to write the content of file, its only writing the file with out data's or content in that file.
Please help me...
Saravanan

Hi Eric
In my domain.log file having the following details. In this file im unable to find out what the exact problem. Please look at this and help me.
<2008-01-22 18:25:42,024> <INFO> <default.collaxa.cube.compiler> validating "C:\product\10.1.3.1\OracleAS_1\bpel\domains\default\tmp\.bpel_BPELProcess2_1.1_298e83988d77b6640c33dfeec11ed31b.tmp\BPELProcess2.bpel" ...
<2008-01-22 18:25:49,850> <INFO> <default.collaxa.cube.engine.deployment> <CubeProcessFactory::generateProcessClass>
Process "BPELProcess2" (revision "1.1") successfully compiled.
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<2008-01-22 18:25:49,914> <INFO> <default.collaxa.cube.activation> <AdapterFramework::Inbound> JCAActivationAgent::load - Locating Adapter Framework instance: OraBPEL
<2008-01-22 18:25:49,930> <INFO> <default.collaxa.cube.activation> <AdapterFramework::Inbound> JCAActivationAgent::load - Done loading JCAActivationAgent for processId='bpel://localhost/default/BPELProcess2~1.1/
<2008-01-22 18:25:49,930> <INFO> <default.collaxa.cube.engine.deployment> Process "BPELProcess2" (revision "1.1") successfully loaded.
<2008-01-22 18:26:02,698> <INFO> <default.collaxa.cube.activation> <AdapterFramework::Inbound> JCAActivationAgent::uninit Shutting down the JCA activation agent, processId='bpel://localhost/default/BPELProcess2~1.0/', activation properties={portType=Read_ptt}
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<2008-01-22 18:26:02,698> <INFO> <default.collaxa.cube.activation> <AdapterFramework::Inbound> JCAActivationAgent::init - Initializing the JCA activation agent, processId='bpel://localhost/default/BPELProcess2~1.1/
<2008-01-22 18:26:02,698> <INFO> <default.collaxa.cube.activation> <AdapterFramework::Inbound> JCAActivationAgent::initiateInboundJcaEndpoint - Creating and initializing inbound JCA endpoint for:
process='bpel://localhost/default/BPELProcess2~1.1/'
domain='default'
WSDL location='rd.wsdl'
portType='Read_ptt'
operation='Read'
activation properties={portType=Read_ptt}
<2008-01-22 18:26:02,698> <INFO> <default.collaxa.cube.activation> <AdapterFramework::Inbound> Adapter Framework instance: OraBPEL - endpointActivation for portType=Read_ptt, operation=Read
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<2008-01-22 18:26:02,730> <INFO> <default.collaxa.cube.activation> <AdapterFramework::Inbound> Adapter Framework instance: OraBPEL - successfully completed endpointActivation for portType=Read_ptt, operation=Read
<2008-01-22 18:26:02,890> <WARN> <default.collaxa.cube.activation> <File Adapter::Inbound> PollWork::run exiting, Worker thread will die
<2008-01-22 18:26:04,171> <INFO> <default.collaxa.cube.ws> <File Adapter::Outbound> Managed Connection Created
<2008-01-22 18:26:04,171> <INFO> <default.collaxa.cube.ws> <File Adapter::Outbound> Connection Created
<2008-01-22 18:26:04,171> <INFO> <default.collaxa.cube.ws> <File Adapter::Outbound> FileInteraction Created

How can I write a file and fill it in periods?

Hi Every body!
I need help with this.
I have my aplication(power quality analiser),This VI obtain several varibles and make a lot of calculus and operation, to obtein others parameters in real time so my problem is Save the acquire data and calculus data into a file (similar as a report) every period(custumizable for the user in time units)
I mean make a only one file wich is write every period continuously , e.g. Start my principal VI and this event start the write of file, past one period,make other row or colum into the same file and continue that way until we stop the principal VI.
How can I make that?
Thaks very much
Best Regards

Hi,
assuming you have your trigger (notifier or just periodically) you can append the data to a single record.
Open the file, set the file position to the end, write the data and close the file.
Hope this helps

Adobe AIR - java is not recognized as an internal or external command operable program or batch file

Hi,
I've done everything as in the HelloWorld tutorial but when i run this cmd: adt
it gives me the following error java is not recognized as an internal or external command operable program or batch file
I've installed the AIR runtime v2
Downloaded the SDK v2 and placed in D:\Www\air
Modified the path variable with D:\Www\air\bin
And then i open a new cmd console and simply write adt and gives me that error.
I've updated to the latest version of Java, but it did solve it.
But what's strage it's that the adl command work, but i'm not being able to pack my application.
I'm running Windows 7 on x64 platform.
Sincerely,
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I think the 32bit version will work, but it sounds like you'll need to add the Java bin folder to your system path. This is usually done by the Java installer, so I'm not sure what failed, did you run the installer located at www.java.com? Either way, this document might be able to help you out:
How do I set or change the PATH system variable
Add the Java "bin" folder to your path, you might also need to add the CLASSPATH.
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Could not write to file C:/WINDOWS/system32/drivers/etc/services.SAPtmp

Hello!
During the installation of the Preview of the Netweaver 2004s (Java) i get in the phase "Install common system files" the following error messages.
ERROR 2006-06-28 14:12:13
FSL-02103 Could not write to file C:/WINDOWS/system32/drivers/etc/services.SAPtmp. Last operating system error message: Der Prozess kann nicht auf die Datei zugreifen, da sie von einem anderen Prozess verwendet wird.
All parameters are the default one!
How could i solve this problem?
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please reply...

Can't read or write some files, internet is failing, youtube won't load, software I tried to install was in Slovenian, not dutch or english like in my systempreferences settings, pictures and files won't preview with spacebar, etc. Malware?

Specs:
iMac 10.8.5
3,4 GHz Intel Core i7
32 GB 1600 MHz DDR3
Can't read or write some files, internet is failing, youtube won't load, security software I tried to install was in Slovenian, not dutch or english like in my systempreferences settings, pictures and files won't preview with spacebar and are randomly corrupted, when I entered something in the Youtube searchbar (when it was still working) it send me to a site with sexadds.
I tried restart my iMac and when I was logged back in, my dock preferences were reset.
Also tried to download some security software to check my Mac for malware, but when I did, I tried several, I got a notification that said something like 'dumpfiles (don't know if this is the right translation...) damaged'.
I'm taking screenshots from all the weird notifications I get and even three quarters off the screenshots I took in the last three hours are already unreadable.
It started this morning when I tried opening a Premiere Pro file on which I worked the night before.
When I tried opening it, it said the file was damaged and could not be openend.
I tried opening it with AE or importing the file in a new project but nothing helped.
When I tried looking for autosaves, this is the really weird part, there were none.
Even though there are autosaves from my other projects, this one was completely gone.
It looked like the day before never happened on my computer.
Also when I openend Premiere all the recent projects had been wiped.
So at first I thought it was a Premiere Pro failure.
But than, later on the day, I tried loading some RAW files from my compact flash card.
This is where I would get an error (error -36) which said some data cannot be read or written.
I tried importing the files with a view different technics, from dragging to importing via Lightroom and I succeeded with Image Browser.
But when I tried moving the files to an other folder the same error occurred.
While dealing with this issue I wanted to put on some soothing music on youtube.
This is when the next weird thing occurred: youtube wasn't completely loading in Chrome. I refreshed a view times, checked the internet connection and still no difference.
When I tried in Safari it did work but when I clicked enter on the searchbar in Youtube, a page with sexadds appeared (I didn't install AdBlock in Safari...).
I read about this 'phishing' where you are redirected to a site were a possible malware installment can take place...
I don't know if it's connected to any of the problems I've been having but I just never experienced this on a mac, I have been a Mac user for 10 years now.
On top of it all, internet started working worse and worse and now it's not even working at all. I had to fill in the password over and over, normally it remembers.
Just like my system preferences, all the preferences I had with Chrome where also reset.
Also somewhere in between I got this notification: Mac OS X must restore library to run programs. Type your password to allow.
To me this is all very weird and suspicious. I have clearly no idea what's going on. Could this be another sort of trojan horse or malware?
Some background info which could be helpful for solving this mystery:
two months ago the one year old Fusion Drive in my iMac just broke out of nowhere.
I got it replaced by a qualified apple repair store.
When I got my computer back, all the files where gone.
I got on the internet without AdBlock installed yet.
A game or whatever it was, can't clearly remember, got installed by accident.
I deleted it immediately.
Only two weeks later, I couldn't log in to my account. It didn't recognize my password and username.
So I brought my mac back to the store.
Here the repair guy said it was a minor thing and he just needed to reconnect my account. He also mentioned he found a downloaded game name Sparta and it probably had something to do with the error.
I asked him; could it be a virus? He replied no way.
I don't know why I couldn't be a virus, just because it's a mac doesn't mean it cannot be done.
So today I tried installing anti virus software (such as avast- was in a weird language looked like slovenian, clamxav - was in slovenian) but I couldn't install them.
PLEASE help me! I don't know what to do anymore, I work fulltime and I need my computer, I have no time to bring it in for repair, are there other perhaps easier ways?
Could this be the work of a virus or a malware? Or is it a disk permissions issue?

It sounds like you may have multiple problems, but none of them are likely to be caused by malware.
First, the internet-related issues may be related to adware or a network compromise. I tend to lean more towards the latter, based on your description of the problem. See:
http://www.adwaremedic.com/kb/baddns.php
http://www.adwaremedic.com/kb/hackedrouter.php
If investigation shows that this is not a network-specific issue, then it's probably adware. See my Adware Removal Guide for help finding and removing it. Note that you mention AdBlock as if it should have prevented this, but it's important to understand that ad blockers do not protect you against adware in any way. Neither would any kind of anti-virus software, which often doesn't detect adware.
As for the other issues, it sounds like you've got some serious corruption. I would be inclined to say it sounds like a failing drive, except it sounds like you just got it replaced. How did you get all your files back after the new drive was installed?
(Fair disclosure: I may receive compensation from links to my sites, TheSafeMac.com and AdwareMedic.com, in the form of buttons allowing for donations. Donations are not required to use my site or software.)

How to to read/write GIf files (not animated)

Hi,
Is there a labview vi(s) that will read a gif file and display it and also that will wirte it? I am interested in non animated gifs.
Louis

Ben wrote:
Well before Mike got carried away in this thread the answer to those questions was "NO".
But if you check that thread you will see that Mike has already done half of the work (reading a gif).
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Message Edited by Phillip Brooks on 10-09-2008 04:24 PM
Now is the right time to use %^<%Y-%m-%dT%H:%M:%S%3uZ>T
If you don't hate time zones, you're not a real programmer.
"You are what you don't automate"
Inplaceness is synonymous with insidiousness

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Hi Experts,
After ECC 6.0, HR-W2 and W2C Form Spools are getting generated in PDF format.
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DATA: pdf_data type FPCONTENT.
types: lt_pdf_table(1000) type x.
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*   filename                        = 'C:\Documents and Settings\Desktop\shital.pdf'
*   filetype                        = 'BIN'
* TABLES
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TRANSFER l_pdf_line TO p_file.
ENDLOOP.
CLOSE DATASET p_file.
IF sy-subrc <> 0.
MESSAGE ID '00' TYPE 'E' NUMBER '398' WITH 'sy-subrc:' sy-subrc
          ' Error closing file:'(Z04) p_file.
ENDIF.
Currently as you can see I have commented out GUI_DOWNLOAD Function Module, But it works perfect when I try to Download file to Local Desktop.
But when I try to pass the same Contents to Application server file and then try to open it by downloading file then it opens BLANK pdf file.
As per requirements I should be able to write the file correctly on Application server and If I dowload it from there it should open PDF file correctly.
Let me know if you require further details about the issue.
Regards
Shital
Edited by: shital phadake on Apr 8, 2009 9:39 PM

Thanks Selçuk for your reply and taking time for understanding the Issue,
I went thru Functionality of the program you suggested but dont think it matches my requirement.
Regards
Shital

How to over write a file on server using Dataset

Hello Experts,
Iu2019ve trying to write a code to fetch data in my program and create a file on server. My program work fine. However every time I run my program it append data at the end of the tile which it created 1st time. I donu2019t want this to happen. I want to new record to print on this file or in other words I want it to over write the file. Here is my code of dataset part.
open dataset file for appending in text mode encoding default.
if sy-subrc ne 0.
write:/ 'File Opening/Creation Error'.
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endif.
loop at ivbrk.
clear record.
    move ivbrk-headr to record+1(1).
    move ivbrk-vbeln to record+3(10).
    move ivbrk-waerk to record+15(5).
    move ivbrk-knumv to record+22(10).
    move ivbrk-fkdat to record+34(8).
    move ivbrk-kunrg to record+43(10).
    move ivbrk-kunag to record+54(10).
      transfer record to file.
    loop at ivbrp where vbeln = ivbrp-vbeln.
     clear items.
      move ivbrp-items to items+1(1).
      move ivbrp-posnr to items+3(6).
      move ivbrp-fkimg to items+11(13).
      move ivbrp-vrkme to items+25(3).
      move ivbrp-meins to items+30(3).
      move ivbrp-ntgew to items+34(15).
      move ivbrp-brgew to items+50(15).
      move ivbrp-gewei to items+66(3).
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endloop.
close dataset file.
Can please somebody tell me what change I should make to over write on this file?
Thanks a lot in advance.
Moderator message - Please use code tags around your code
Edited by: Rob Burbank on Jan 12, 2010 5:08 PM

Hey zero:
open dataset file for appending in text mode encoding default.
Probably because you're opening it for appending.
Rob

Write to file(AVI) synchronizate data

I receive a USB Camera signal and a CAN(Control Area Network) signal.
I like two signal parallel displaying and write to file (one or more) and after read.
I practise IMAQ AVI Write Frame.vi with DATA.
I receive USB Camera signal around 15fps (but this is not constant). Two CAN messages receive 10ms/sec.
(200 CAN messages per sec -> 1camera signal/14 messages: I make a queue. When receive a Camera signal, than in all queue data associated with the image to write).
I make two loop:
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CAN_AVI.llb ‏465 KB

Hi
For the VI in the attachment (from the CAN_AVI.llb) the
problematic part is the " call library function node" which is defined
as the wecanusb.dll.
What should be done ? How the input
parameters should be processed to be outputted by the " call library
function node" block ?
thank you..
Message Edited by HIDIR on 04-23-2009 03:43 PM
Message Edited by HIDIR on 04-23-2009 03:44 PM
Message Edited by HIDIR on 04-23-2009 03:47 PM
Attachments:
examine.doc ‏56 KB

Can't write cache file for while creating domain in soa 11.1.1.5 on HP-UX

Hi,
Installing SOA 11.1.1.5 on HP-UX and during domain creation/configuration I am getting the below errors
**sys-package-mgr: can't write cache file for**
and have lots of cache file errors for different packages
Any idea what might be wrong and whats the cause of these errors and is it safe to ignore these errors if not what is the work arround. As I already looked at the below post but I don't find */var/tmp/wlstTemp* on my machine as suggested in the post below.
SOA 11.1.1.5 install got can't write cache file
So wondering if there's anything else I can do i.e. while creating or configuring a Domain pass some parameter to config.sh etc.
Thanks

Hi,
I don't see python.cachedir in config.sh. Here is config.sh
#!/bin/sh
mypwd="`pwd`"
# Determine the location of this script...
# Note: this will not work if the script is sourced (. ./config.sh)
SCRIPTNAME=$0
case ${SCRIPTNAME} in
/*) SCRIPTPATH=`dirname "${SCRIPTNAME}"` ;;
*) SCRIPTPATH=`dirname "${mypwd}/${SCRIPTNAME}"` ;;
esac
# Set the ORACLE_HOME relative to this script...
ORACLE_HOME=`cd "${SCRIPTPATH}/../.." ; pwd`
export ORACLE_HOME
# Set the MW_HOME relative to the ORACLE_HOME...
MW_HOME=`cd "${ORACLE_HOME}/.." ; pwd`
export MW_HOME
# Set the home directories...
. "${SCRIPTPATH}/setHomeDirs.sh"
# Set the config jvm args...
CONFIG_JVM_ARGS="${CONFIG_JVM_ARGS} -DCOMMON_COMPONENTS_HOME='${COMMON_COMPONENTS_HOME}'"
export CONFIG_JVM_ARGS
# Delegate to the main script...
"${WL_HOME}/common/bin/config.sh" "$@"Thanks

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