LabVIEW built-in file I/O VIs have poor performance on network file I/O operation?

Hi,
I use LabVIEW built-in VIs to save a big 2-D array data into a ascii file (with the "write character to file" vi). When I write it on the local hard drive, it takes about 5 seconds to complete the task. But when I write the file on the network, it takes more than 5 minutes. A typical output file is 5MB big.
If I write the file on the hard drive, and use the built-in File MOVE vi, it takes about 30 seconds to complete the MOVE operation. But if I use Windows File Explorer to move the same file, it takes less than 1 second.
Both the PC and server are connected on a full-duplex 100BaseT network. I tried different file I/O operations (including MOVE, create new file and LIST)
with LabVIEW VIs and compared the speed with windows file explorer. It turned out LabVIEW VIs performance is always A LOT slower than Windows File Explorer. I tried the same test on many different PCs, with windows 98, NT, 2000, and the results are the same.
Is there anyway to improve the file IO performance or is there any other workaround on this issue, such as calling Windows File Explorer to perform the same task via ActiveX maybe?
Your imputs will be very much appreciated. Thanks!
Dan

Hi,
Do the ASCII files have a .txt extention? I've noticed the same behaviour
once, with .txt files. Renaming them (to e.g. .txq) fixed the problem.
I'm clueless why this happend. If you extentions are not .txt, I don't have
a clue...
What if you copy the file, and then delete the original?
Regards,
Wiebe.
"dikrn" wrote in message
news:506500000008000000EA7C0000-1042324653000@exchange.ni.com...
> Hi,
>
> I use LabVIEW built-in VIs to save a big 2-D array data into a ascii
> file (with the "write character to file" vi). When I write it on the
> local hard drive, it takes about 5 seconds to complete the task. But
> when I write the file on the network, it takes more than 5 minutes. A
> typical output file is 5MB big.
>
> If I write the file
on the hard drive, and use the built-in File MOVE
> vi, it takes about 30 seconds to complete the MOVE operation. But if I
> use Windows File Explorer to move the same file, it takes less than 1
> second.
>
> Both the PC and server are connected on a full-duplex 100BaseT
> network. I tried different file I/O operations (including MOVE,
> create new file and LIST) with LabVIEW VIs and compared the speed with
> windows file explorer. It turned out LabVIEW VIs performance is
> always A LOT slower than Windows File Explorer. I tried the same test
> on many different PCs, with windows 98, NT, 2000, and the results are
> the same.
>
> Is there anyway to improve the file IO performance or is there any
> other workaround on this issue, such as calling Windows File Explorer
> to perform the same task via ActiveX maybe?
>
> Your imputs will be very much appreciated. Thanks!
>
> Dan

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# If your server contains mostly text or HTML documents, "text/plain" is
# a good value. If most of your content is binary, such as applications
# or images, you may want to use "application/octet-stream" instead to
# keep browsers from trying to display binary files as though they are
# text.
DefaultType text/plain
<IfModule mime_module>
    # TypesConfig points to the file containing the list of mappings from
    # filename extension to MIME-type.
    TypesConfig /private/etc/apache2/mime.types
    # AddType allows you to add to or override the MIME configuration
    # file specified in TypesConfig for specific file types.
    #AddType application/x-gzip .tgz
    # AddEncoding allows you to have certain browsers uncompress
    # information on the fly. Note: Not all browsers support this.
    #AddEncoding x-compress .Z
    #AddEncoding x-gzip .gz .tgz
    # If the AddEncoding directives above are commented-out, then you
    # probably should define those extensions to indicate media types:
    AddType application/x-compress .Z
    AddType application/x-gzip .gz .tgz
    # AddHandler allows you to map certain file extensions to "handlers":
    # actions unrelated to filetype. These can be either built into the server
    # or added with the Action directive (see below)
    # To use CGI scripts outside of ScriptAliased directories:
    # (You will also need to add "ExecCGI" to the "Options" directive.)
    #AddHandler cgi-script .cgi
    # For type maps (negotiated resources):
    #AddHandler type-map var
    # Filters allow you to process content before it is sent to the client.
    # To parse .shtml files for server-side includes (SSI):
    # (You will also need to add "Includes" to the "Options" directive.)
    #AddType text/html .shtml
    #AddOutputFilter INCLUDES .shtml
</IfModule>
# The mod_mime_magic module allows the server to use various hints from the
# contents of the file itself to determine its type. The MIMEMagicFile
# directive tells the module where the hint definitions are located.
#MIMEMagicFile /private/etc/apache2/magic
# Customizable error responses come in three flavors:
# 1) plain text 2) local redirects 3) external redirects
# Some examples:
#ErrorDocument 500 "The server made a boo boo."
#ErrorDocument 404 /missing.html
#ErrorDocument 404 "/cgi-bin/missing_handler.pl"
#ErrorDocument 402 http://www.example.com/subscription_info.html
# EnableMMAP and EnableSendfile: On systems that support it,
# memory-mapping or the sendfile syscall is used to deliver
# files. This usually improves server performance, but must
# be turned off when serving from networked-mounted
# filesystems or if support for these functions is otherwise
# broken on your system.
#EnableMMAP off
#EnableSendfile off
TraceEnable off
# Supplemental configuration
# The configuration files in the /private/etc/apache2/extra/ directory can be
# included to add extra features or to modify the default configuration of
# the server, or you may simply copy their contents here and change as
# necessary.
# Server-pool management (MPM prefork specific)
StartServers 1
MinSpareServers 1
MaxSpareServers 1
# ServerLimit and MaxClients support n% syntax which sets them to a
# fraction of the current RLIMIT_NPROC limit.
ServerLimit 50%
MaxClients 50%
ListenBackLog 512
MaxRequestsPerChild 100000
# Timeout: The number of seconds before receives and sends time out.
Timeout 300
# KeepAlive: Whether or not to allow persistent connections (more than
# one request per connection). Set to "Off" to deactivate.
KeepAlive On
# KeepAliveTimeout: Number of seconds to wait for the next request from the
# same client on the same connection.
KeepAliveTimeout 15
# MaxKeepAliveRequests: The maximum number of requests to allow
# during a persistent connection. Set to 0 to allow an unlimited amount.
# We recommend you leave this number high, for maximum performance.
MaxKeepAliveRequests 100
# UseCanonicalName: Determines how Apache constructs self-referencing
# URLs and the SERVER_NAME and SERVER_PORT variables.
# When set "Off", Apache will use the Hostname and Port supplied
# by the client. When set "On", Apache will use the value of the
# ServerName directive.
UseCanonicalName Off
# AccessFileName: The name of the file to look for in each directory
# for additional configuration directives. See also the AllowOverride
# directive.
AccessFileName .htaccess
# ServerTokens
# This directive configures what you return as the Server HTTP response
# Header. The default is 'Full' which sends information about the OS-Type
# and compiled in modules.
# Set to one of: Full | OS | Minor | Minimal | Major | Prod
# where Full conveys the most information, and Prod the least.
ServerTokens Full
# Optionally add a line containing the server version and virtual host
# name to server-generated pages (internal error documents, FTP directory
# listings, mod_status and mod_info output etc., but not CGI generated
# documents or custom error documents).
# Set to "EMail" to also include a mailto: link to the ServerAdmin.
# Set to one of: On | Off | EMail
ServerSignature On
# HostnameLookups: Log the names of clients or just their IP addresses
# e.g., www.apache.org (on) or 204.62.129.132 (off).
# The default is off because it'd be overall better for the net if people
# had to knowingly turn this feature on, since enabling it means that
# each client request will result in AT LEAST one lookup request to the
# nameserver.
HostnameLookups Off
# PidFile: The file in which the server should record its process
# identification number when it starts.
PidFile /var/run/httpd.pid
# The accept serialization lock file MUST BE STORED ON A LOCAL DISK.
LockFile "/private/var/log/apache2/accept.lock"
<IfModule mod_rewrite.c>
    RewriteLock /var/log/apache2/rewrite.lock
</IfModule>
# Language settings
Include /private/etc/apache2/extra/httpd-languages.conf
<IfDefine WEBSHARING_ON>
# Multi    -language error messages
#Include /private/etc/apache2/extra/httpd-multilang-errordoc.conf
# Fancy directory listings
Include /private/etc/apache2/extra/httpd-autoindex.conf
# User home directories
Include /private/etc/apache2/extra/httpd-userdir.conf
# Real-time info on requests and configuration
#Include /private/etc/apache2/extra/httpd-info.conf
# Virtual hosts
#Include /private/etc/apache2/extra/httpd-vhosts.conf
# Local access to the Apache HTTP Server Manual
Include /private/etc/apache2/extra/httpd-manual.conf
# Distributed authoring and versioning (WebDAV)
#Include /private/etc/apache2/extra/httpd-dav.conf
</IfDefine>
# Secure (SSL/TLS) connections
<IfDefine !MACOSXSERVER>
#Include /private/etc/apache2/extra/httpd-ssl.conf
</IfDefine>
<IfDefine MACOSXSERVER>
<IfModule mod_ssl.c>
        SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown
        SSLPassPhraseDialog exec:/etc/apache2/getsslpassphrase
        SSLSessionCache shmcb:/var/run/ssl_scache(512000)
        SSLSessionCacheTimeout 300
        SSLMutex file:/var/run/ssl_mutex
        SSLRandomSeed startup builtin
        SSLRandomSeed connect builtin
        AddType application/x-x509-ca-cert crt
        AddType application/x-pkcs7-crl crl
</IfModule>
</IfDefine>
<IfModule mod_jk.c>
        JKWorkersFile /etc/apache2/workers.properties
        JKLogFile /var/log/apache2/mod_jk.log
        JkShmFile /var/log/apache2/jk-runtime-status
</IfModule>
<IfModule php5_module>
    AddType application/x-httpd-php .php
    AddType application/x-httpd-php-source .phps
    <IfModule dir_module>
        DirectoryIndex index.html index.php
    </IfModule>
</IfModule>
<IfDefine !MACOSXSERVER>
    Include /etc/apache2/other/*.conf
</IfDefine>
<IfDefine MACOSXSERVER>
    <IfDefine WEBSERVICE_ON>
        Include /etc/apache2/sites/*.conf
    </IfDefine>
    <IfDefine !WEBSERVICE_ON>
        Include /etc/apache2/sites/virtual_host_global.conf
        Include /etc/apache2/sites/*_.conf
        Include /etc/apache2/sites/*__shadow.conf
    </IfDefine>
</IfDefine>

That's a comment in the file. It has no effect at all.

I have been backing up iMovie 08 files to my external drive, but for some reason I can't open these files in iMovie. I used drag and drop to copy them.

I have been backing up iMovie 08 files to my external drive, but for some reason I can't open these files in iMovie. I used drag and drop to copy them.

You really should be doing backups with an actual backup application, especially one that will work automatically, and, if your external HD is large enough, back up your entire system. These can automatically back up only what's changed since the previous backup, and some will keep "archive" copies of things you've changed or deleted, also.
Too many things can go wrong, such as your internal HD failing, and you'll have a major project to reinstall everything.
You already have Time Machine, built-in to OSX. You might want to review the Time Machine Tutorial, and perhaps browse Time Machine - Frequently Asked Questions.
#27 in the second link mentions some alternatives, too.

Oracle.apps.fnd.soa.util.SOAException: ServiceProcessingError: Exception returned from JCA Service Runtime. file:/u01/oracle/VIS/inst/apps/VIS_oracle-ebs/soa/PLSQL/4892/XXBT_MIDAS_ORDER_CREATION.wsdl

we are getting below issue while generating WSDL .Can you please help me some one ?
Error Description
Error occured while service was processing.
Error Details
oracle.apps.fnd.soa.util.SOAException: ServiceProcessingError: Exception returned from JCA Service Runtime. file:/u01/oracle/VIS/inst/apps/VIS_oracle-ebs/soa/PLSQL/4892/XXBT_MIDAS_ORDER_CREATION.wsdl [ XXBT_MIDAS_ORDER_CREATION_ptt::XXBT_MIDAS_ORDER_CREATION(InputParameters,OutputParameters) ] - WSIF JCA Execute of operation 'XXBT_MIDAS_ORDER_CREATION' failed due to: Could not instantiate InteractionSpec oracle.tip.adapter.apps.AppsStoredProcedureInteractionSpec due to: Error while setting JCA WSDL Property. Property setIRepOverloadSeq is not defined for oracle.tip.adapter.apps.AppsStoredProcedureInteractionSpec Please verify the spelling of the property. ; nested exception is: ORABPEL-12532 Error while setting JCA WSDL Property. Property setIRepOverloadSeq is not defined for oracle.tip.adapter.apps.AppsStoredProcedureInteractionSpec Please verify the spelling of the property. ; nested exception is: org.collaxa.thirdparty.apache.wsif.WSIFException: Could not instantiate InteractionSpec oracle.tip.adapter.apps.AppsStoredProcedureInteractionSpec due to: Error while setting JCA WSDL Property. Property setIRepOverloadSeq is not defined for oracle.tip.adapter.apps.AppsStoredProcedureInteractionSpec Please verify the spelling of the property. ; nested exception is: ORABPEL-12532 Error while setting JCA WSDL Property. Property setIRepOverloadSeq is not defined for oracle.tip.adapter.apps.AppsStoredProcedureInteractionSpec Please verify the spelling of the property. at oracle.apps.fnd.soa.provider.services.jca.JCAHandler.invoke(JCAHandler.java:169) at oracle.apps.fnd.soa.provider.services.jca.JCAHandler.handleRequest(JCAHandler.java:113) at oracle.apps.fnd.soa.provider.SOAProvider.processMessage(SOAProvider.java:342) at oracle.j2ee.ws.server.provider.ProviderProcessor.doEndpointProcessing(ProviderProcessor.java:956) at oracle.j2ee.ws.server.WebServiceProcessor$1.run(WebServiceProcessor.java:358) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at oracle.j2ee.ws.server.WebServiceProcessor.invokeEndpointImplementation(WebServiceProcessor.java:355) at oracle.j2ee.ws.server.provider.ProviderProcessor.doRequestProcessing(ProviderProcessor.java:466) at oracle.j2ee.ws.server.WebServiceProcessor.processRequest(WebServiceProcessor.java:114) at oracle.j2ee.ws.server.WebServiceProcessor.doService(WebServiceProcessor.java:96) at oracle.j2ee.ws.server.WebServiceServlet.doPost(WebServiceServlet.java:194) at javax.servlet.http.HttpServlet.service(HttpServlet.java:763) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:713) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370) at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871) at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453) at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:313) at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:199) at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260) at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303) at java.lang.Thread.run(Thread.java:619) org.collaxa.thirdparty.apache.wsif.WSIFException: file:/u01/oracle/VIS/inst/apps/VIS_oracle-ebs/soa/PLSQL/4892/XXBT_MIDAS_ORDER_CREATION.wsdl [ XXBT_MIDAS_ORDER_CREATION_ptt::XXBT_MIDAS_ORDER_CREATION(InputParameters,OutputParameters) ] - WSIF JCA Execute of operation 'XXBT_MIDAS_ORDER_CREATION' failed due to: Could not instantiate InteractionSpec oracle.tip.adapter.apps.AppsStoredProcedureInteractionSpec due to: Error while setting JCA WSDL Property. Property setIRepOverloadSeq is not defined for oracle.tip.adapter.apps.AppsStoredProcedureInteractionSpec

Hi HDeiby,
I didn't find the "setIRepOverloadSeq" in wsdl file.i have verified all wsdl files but i didn't find. Please let me know excat file name .
[applmgr@oracle-ebs 4892]$ ls -ltr
total 24
-rwxrwxrwx 1 applmgr dba 3167 Sep 5 02:46 XXBT_MIDAS_ORDER_CREATION.wsdl
-rwxrwxrwx 1 applmgr dba 706 Sep 5 02:46 XXBT_MIDAS_ORDER_CREATION_PKG.wsdl
-rwxrwxrwx 1 applmgr dba 3534 Sep 5 02:46 XXBT_MIDAS_ORDER_CREATION_PKG_soap.wsdl
-rwxrwxrwx 1 applmgr dba 3328 Sep 5 02:46 XXBT_MIDAS_ORDER_CREATION_PKG_soap_http.wsdl
-rwxrwxrwx 1 applmgr dba 1328 Sep 5 02:46 APPS_XXBT_MIDAS_ORDER_CREATION_PKG_XXBT_MIDAS_ORDER_CREATION.xsd
-rwxrwxrwx 1 applmgr dba 1245 Sep 5 02:46 AppsContextHeader.wsdl

I have 100 data files, I want to join them together as one data file

I need to join approx. 100 data files into one data file, and be able to read back each data file from that one big file. I would also like a feature to count how many files are in the main one file. The data files contain graphs, text and numerics.

What you want to do is not going to be easy to implement. The idea is that files are just binary data and you can join the data into one binary file. The trick is going to be creating the appropriate header for the binary file to include things like file location--the beginning and end of a subfile--as well as the number of files. The exact structure of the header is really left up to you and your imagination.
Why do you want to join all the files into one? It sounds like what you have works now and making one file increases the chances that all of your data will be lost if the file becomes corrupted. Also LabVIEW is limited to files of about 2GBytes, so you will be more likely to run into this limit.

How to input video files into IMAQ VIs

I have existing mp2 video files (which I could easily convert to other formats) that I would like to input into IMAQ 6.0 VIs to analyze, one frame at a time. Is there a way to grab frames from a video file (without grabbing hardware) to analyze with IMAQ?

There is an example posted on Developer Zone that will allow you to read back and analyze individual frames from an AVI file (search for IMAQ AVI Read Write Example). If you can convert your MPEG files into AVI files, you should have no problem analyzing the images using IMAQ Vision.
Bear in mind that the MPEG file formats use lossy compression - that is information present within the original images will be lost as part of the MPEG compression process. This may affect the quality of the images that you will be analyzing with IMAQ Vision.
NI has never directly supported the analysis of "movie" files for this reason (the use of compression in the file generation process). The IMAQ Vision software tools are generally targetted towards "machine vision applicati
ons" i.e. where the camera is connected directly to a frame grabber and then processed in software. That being said, I've used this example previously and it should prove a good starting point for your work.

After having downloaded I have been unable to open the files using right click or double clicking in the download windo

I am using Windows 7 along with Office 10. I have downloaded a number of zip files into Download location. Although the files are shown in the firefox download window they are not on my computer hard disk. Although I can access the Firefox download window and get the menu when I right click on a file and click on open nothing happens. The same outcome when I double click on the file in the window. I need to understand where the download files are and how to open them before I go crazy.

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Hold down the Shift key and left-click the Reload button
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (Mac)
Clear the cache and the cookies from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Firefox uses the about: protocol to access built-in about: pages that you can open via the location bar just like you open web pages.
*http://kb.mozillazine.org/About_protocol_links).
*Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

LabVIEW built-in file I/O VIs have poor performanc​e on network file I/O operation?

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