Sharing a communication object between test sockets

Hi everyone, I am having some trouble using teststand in batch mode as it is my first time doing so. Here is my question:
I am creating a test sequence that uses multiple test sockets. I am using a switching matrix that is controlled over ethernet to allow me to connect different loads to the hardware under test. I only have one load, but I have several different devices that need to connect to that load for the tests to be run, and they can only be connected one at a time.
My approach was to initilaze the connection to the switching matrix and store the resulting object reference as a global variable, which allows me to send commands to the switch matrix from any sub-sequence. I then created another sub sequence for the load tests called "External Load Tests". In this step, the load is connected to the hardware via the switching matrix, and tests are run. I am using batch mode, so I put a lock on the "External Load Tests" sub sequence so that only one thread can enter at a time.
This sequence works if there is only one active test socket. If there is more that one, the first thread will get inside the external "External Load Tests" step and try to send a command to the switch matrix using the object reference that I mentioned. However, when this happens, the step hangs indefinitely until the other threads are manually stopped. It seams like the thread isnt being given access to the switch matrix object, becuase usually if there is an error the switch matrix driver throws an exception, but in this case it just hangs.
Any ideas on how I can fix this? I don't have a lot of experience with multi threading, so any advice would be greatly appreciated.
Thanks!

For the batch model you could use a serialized batch synchronization section rather than a lock. A lock should also work though, it just doesn't guarantee that all threads get to the section before any of them continue and doesn't guarantee the order like batch synchronization does. Typically you should use all default settings for the batch model (other than perhaps number of sockets). Which setting did you change? The 'Default Batch Synchronization' setting? You should typically leave this as "Don't Synchronize". Setting this to Parallel makes it synchronize at every step which requires all sockets to get to each step before any of them to continue. This is not the behavior that people typically want. In most cases you should use the default of "Don't Synchronize" and then set synchronization manually in your sequence where you want it, either using the step synchronization settings, or the batch synchronization step types, or other synchronization step types such as locks.
Hope this helps,
-Doug

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Sharing an object between other objects?

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Create a listener interface. Make each class implement that interface. When you create each class, register it as a listener to theData. Keep track of all listeners in a List such as an ArrayList. When you want to change theData, iterate through the List and call the interface's method to update theData in each class:
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(UIX XML) Sharing Connection objects between BC4J and custom java.

If I have a UIX XML page that contains some BC4J application modules, then in the event handler I call [public static EventResult handleMyEventEvent (BajaContext context, Page page, PageEvent event..) ], which in turn calls some java classes I have written that take a java.sql.Connection object and access the database doing some updates/inserts with this Connection object (via JDBC)....HOW CAN I USE THE SAME TRANSACTION AS WAS USED IN THE BC4J APPLICATION MODULE...i.e. CAN I SHARE THE CONNECTION OBJECT BETWEEN BC4J AND MY OWN JAVA CLASSES THAT USE JDBC?
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Would it be easier to use a custom method on the bc4j Application module?
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(Notice: no commit yet!)
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How about having a method on the bc4j App Mod's VO called 'reviewSalary'? Calling this would use the same transaction? I could then call my java class from within the VO's method? However do I still have the same problem in that my java class expects to be passed the connection object?
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Shared Variable communication (network publiched )

Hi all ,
The whole day I have been banging my head with Shared variable communication between RT Host and host computer :
I essentially attempted to pass an array from the RT host to the Host computer .For this purpose I used a Network published shared variable of type Array U64 . I utilized this link to help me understand usign shared variable communication
http://www.ni.com/white-paper/4679/en ..
I also enabled RT FIFO .Now in the mentioned link this the information given about using single element FIFO or Multi element FIFO
'' By enabling the real-time FIFO, you can select between two slightly different types of FIFO-enabled variables: the single-element and the multielement buffer. One distinction between these two types of buffers is that the single-element FIFO does not report warnings on overflow or underflow conditions. A second distinction is the value that LabVIEW returns when multiple readers read an empty buffer. Multiple readers of the single-element FIFO receive the same value, and the single-element FIFO returns the same value until a writer writes to that variable again. Multiple readers of an empty multielement FIFO each get the last value that they read from the buffer or the default value for the data type of the variable if they have not read from the variable before.''
I had read the above content a 100 times but still I am not able to get a clear picture of the difference and when to use which option .So I decided to throw away the text and attempted to try somethign out for myself .
I had a loop in the RT host that writes different 3 element arrays into the ''network published shared variable '' . Now when I use the multi element option with '' number of arrays as - 2 '' I am able to read the arrays seperates one by one in the host computer ( as we can read a general queue).
Now when I used the single element option for the RT FIFO with un editable 1 array option ,only the last written array into the ''network published shared variable '' gets read in the host computer .
This sounds absolutely silly as if this is the case then what is the purpose of setting the ''buffer''.For testing purposes I had set the buffer as 5 arrays .
In fact I have only one writer ( writing in loop in the RT Host ) and one reader ( again reading in loop in the Host computer ).So I am not even sure if I require The RT FIFO option for the network published shared variable .
I apologise for the long message but I have reached the limits of running in circles waiting to bang somewhere
I know I am doing a silly mistake somewher or I am probably missing a simple obvious trick but dont know what it is ..
I request for some clarity .. In fact I had posted a little while earlier today as well .... link - http://forums.ni.com/t5/LabVIEW/RT-Host-to-Host-computer-communication/td-p/2348130 )
any help would be appreciated
Cheers
me
Solved!
Go to Solution.

Hi,
I think the difference between both types is clearer in the LabVIEW help :
Enabling the Real-Time FIFO
You can enable the real-time FIFO of a shared variable from the Real-Time FIFO page of the Shared Variable Properties dialog box. Place a checkmark in the Enable Real-Time FIFO checkbox to deterministically share data using single element or multi-element FIFOs.
Single Element FIFO
A single-element FIFO shares the most recent data value. The shared variable overwrites the data value when it receives a new data value. Use this option when you need only the most recent value. Configure the size of the array elements or the size of the waveform for the FIFO buffer if you select an array or waveform data type.
Multi-Element FIFO
A multi-element FIFO buffers the values shared by the shared variable. You can configure the size and the elements of the FIFO buffer to match the settings from the Use Buffering section of the Variable page, or you can configure a custom size for the FIFO and the FIFO elements.
Note For both single-element and multi-element FIFOs, if the variable contains array or waveform data, you must configure the size of the FIFO elements equal to the size of the data you want to share. If both the network buffer and the RT FIFO are enabled, the network buffer must be at least as large as one FIFO element. Sharing data smaller or larger than the length you specify causes a memory allocation that affects determinism.
Note Waveforms contain variable-size variant elements that are not compatible with the Real-Time FIFO. Therefore, if you enable the Real-Time FIFO on a shared variable that contains waveform data, the variant element of the waveform data does not transfer.
http://zone.ni.com/reference/en-XX/help/370622K-01/lvrtconcepts/rt_projectvariable/#Single_Element_F...
'Hope it helps
Aurelie

Getting Test Socket status in batch mode

Hi!
I´m running multiple UUT´s in the standard batch model.
I need to find a way to get a teststep running in one test socket to know the current status (passed, failed, terminated etc.) for all other test sockets.
Is this possible?
One solution might be to have each test socket to store the context pointer (CAObjHandle seqContextCVI when using LabWindows) to an array at the beginning of each test socket and then access each others test socket context. This way it might be possible if there is a context value or string to look for. Is this a good idea at all or are there better solutions?
/ Roine

Hi,
this would in fact be better in the TestStand discussion group.
However, there are several options available to you.
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The second option is to store the seqContext pointer, however, this pointer is only a reference to where you currently are, i.e. if you start flying around launching other threads, then your seqContext might not be correct at that time
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Hope that helps
Sacha Emery
National Instruments (UK)
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Communication problem between NetBeans and Tomcat

hi!
i got a quite mysterious problem. here is what happens:
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okay.
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In the lower-right corner i see this blue working-bar that sais "deploying project" but nothing happens. The Project-Debugger-Output still sais "Waiting for Tomcat..." but nothing happens...
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i'm trying to solve this problem for 4 days now, so i would be very happy if anyone has an idea where to start/continue the search...
thanks,
flo.
some system-info:
- windows vista business 32-bit
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As i wrote before, the same problem occured for me. I have found a solution which is : Go to tools menu and then select options . In the proxy info, select No Proxy.
I hope this help you

Disable a test socket during execution (Batch Mode)

We are running a Batch Model with Batch Synchronization. I am wondering if it is at all possible to totally disable one or more of the test socket during execution. I know that the opening screen allows you to choose which sockets are active, but in the event that something goes astray like the RS-485 communication is non-responsive, I would like to disable one or more at anytime during the test. Thank you in advance for any ideas you come up with.
Regards
Scott
Environment: TestStand 2010
Solved!
Go to Solution.

I am not aware of how to stop a socket which is already running and facing an error midway.
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How can I terminate ALL test sockets from API

I want to terminate all my test sockets (Batch model).
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Is there any way to terminate all sockets through NI TestStand API Automation Server ?
I succecced to terminate only one socket (object class RunState.Execution), but I didn't find any way to terminate all test sockets.
Thank's to someone that will answer.

Hi,
Yes, use Engine.TerminateAll
You will find reference to it in the TestStand Help
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Ray Farmer
Regards
Ray Farmer

Compare DB objects between different schemas

Hi,
I want to compare db objects beween 2 different schemas like QA and PROD.
Please suggest me a tool that compares table definitions,stored procedures and other db objects between different schemas.

Did you check the above video link which is shared?
Yes I'd agree with you and also i faced these situations to check what objects i need to export from Dev to Quality ( to analyze what are already correct or what have to be imported again)
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Krishna Tangudu

Disabling Test Sockets in SinglePass.

I am new to TestStand and LabWindows and am trying to figure out how to
pass serial number and socket status to a sequence file from a
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figure out a way to pass serial numbers and socket status via the
Parameters.ModelData.TestSockets[x] sub property. The problem is that
it appears that SinglePass is waiting for all the test sockets to
complete whether they are enabled or not. It seems to never get out of
the step "Wait For TestSockets" under the SinglePass entry point.
Is there an easy way to do this? I really don't want to use the
TestUUT's entry point. Should I just customize the SinglePass entry
point with logic in the "Wait For TestSockets" loop or is there a
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Thanks,
John

Hello John,
To answer your first question, generally to pass information
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your sequence post a UIMessage, and your operator interface reads the message
and responds. If you look at the
PostUIMessage help you see the following definition:
Thread.PostUIMessageEx ( eventCode, numericDataParam,
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Next, you mention that you are having problems with test
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have been able to disable a test socket if the user does not type in a serial
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Regards,
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Applications Engineering
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Communication protocol between Admin Server and Managed Server

Hello - I am hoping someone can help me here to understand the communication protocols used in my setup.
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End User <--->HTTPS<--->LoadBalancer Device<--->HTTPS<--->Web Server<---->HTTPS<--->WebLogic Server(Managed Server)<--->LDAP/JDBC<-->Data tier components
AdminServer<--->T3<--->Managed Server i.e. The communication protocol between Admin Server and Managed server is T3
The communication protocol between Managed Servers running in one cluster on two seperate machine is What?
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Hello, interesting question.
In the documentation " [cluster multicast communication|http://download.oracle.com/docs/cd/E13222_01/wls/docs90/cluster/features.html#1007001] " don't specify the used protocol to pack the information for example in a session replication.
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http://download.oracle.com/docs/cd/E13222_01/wls/docs90/cluster/features.html#1007001

Best communication method between LV Application

Hello Together,
I'm looking for the best communication way between two LabVIEW Applications. As VI is clear, I can use a Queue or a global variable and so on.
But what is the best, when I compile the VIs later to DLLs or Applications. Till now we always use TCP/IP, but I think there must be a better way instead of this.
So if anybody has an idea - it's very welcome.
Thanks in advance
Markus
Solved!
Go to Solution.

Traxx wrote:
What I don't like with TCP/IP that you always need a second thread (while loop) who handle the TCP/IP communication. I thought that there must be an easier way.
I also thought that shared variables are always limited to one application. Thanks for the ideas...
That second loop is a loop that YOU control. If you go with shared variables you are a slave to whatever they can or can not do. Besides, they run on top of TCP/IP so it is not out of the picture.
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Re: (forte-users) Communication Pbs between a NT client& a HP 11 load-b

Hi,
I think you misunderstand the anatomy of an Array object. The size of an
Array containing 63 elements can never be 1638 bytes when each element
contains a 100 byte string.
If you use the sizeof function, you'll only get the combined size of all
attributes of the object. But if an object contains attributes that are
objects themselves (e.g. TextData), then only the size of the pointer to
this object is counted. Not the object itself.
Array and LargeArray offer the same functionality but use different
algorithms. LargeArray is better suited for large lists and Array is better
suited for small lists. Array is faster, but requirs more memory. LargeArray
is slower, but requires less memory.
Array reserves a piece of memory that holds 63 pointers to objects. Within
these 63 positions, you can read and write randomly. When you add a 64th
object, Array locates a new piece of memory that holds 127 pointers. The
first 63 pointers are copied to this new location and the original location
is free for garbage collection. When you add a 128th object, Array locates a
new piece of memory that holds 255 pointers. etc.
Check if you're network communication time is closer to what you expect when
you have 127 elements in your list. And then check if performance drops
again when you have 128 elements.
Also, take into account that Forte is not capable of measuring time in very
small units. 80 ms and 150 ms might really just be 3 ms apart. Also, garbage
collection might kick in at any moment, slowing down performance. If you
have a multi-user OS, it might suddenly start doing maintenance tasks, that
reduce the amount of processor time available for your partition, either the
partition that sends the array, or the partition that receives it.
Sending an object requires the object to be serialised, send and
deserialised. The partition that invoked the Send() method blocks during
this whole process. If deserialising at the other end takes longer, then the
process simply waits longer.
-----Original Message-----
From: Olivier Brousseau [SMTP:Olivier.Brousseausema.fr]
Sent: Thursday, April 06, 2000 7:05 PM
To: kamranaminyahoo.com
Cc: Eric ABECASSIS; Giulio CALIENDO
Subject: (forte-users) Communication Pbs between a NT client & a HP
11 load-balanced server : 100ms to transfer 1600 bytes on a 10Mbits link.
Hi,
we have done a very small application to instrument & verify the
communication capabilities of our soft & network :
1. a win NT client that generates an array of object ( nb of object is a
parameter ), and that send it to a server.
2. a HP11 server, that contains a load-balanced SO ( with only one
replicate ). The prototype of the SO entry point, which does nothing, is
as
follows :
void send( input GenericArray of Element );
And Element is a class that contain a DataValue attribute with a 100 bytes
string.
Between the client & server, we have a 10 Mbits link ( it has been
verified
using FTP ). From 1 object sent, to 63 objects, ( size of the array with
63
objects = 1638 bytes ), everything is OK. The elapsed time is 10
milliseconds.
With 64 objects ( size of the array = 1666 bytes ), the elapsed time is
100
milliseconds ( in fact for one iteration, it's 80 msec, for the next one,
150 msec, and then it's 80 msec, etc... ).
All the results with more objects than 63 are awfull.
Has anyone enccountered such a problem ?
Can anyone advise ?
Thanks,
olivier
Nota. Both server & client are built from Forté 3.0.M
O. Brousseau
Architecture & Performance Team
Sema Group France ( DTS )
For the archives, go to: http://lists.xpedior.com/forte-users and use
the login: forte and the password: archive. To unsubscribe, send in a new
email the word: 'Unsubscribe' to: forte-users-requestlists.xpedior.com

Get individual test socket execution reference

Hi All,
Versions used: LV 2014, TS 2014, Parallel model with each DUT independently tested, Custom OI built as per need
I have an application where at most 8 test sockets can run at a time, independent of each other. Each DUT must be independently started, paused or aborted from LabVIEW custom OI. How do I get the individual test socket execution reference so that I can send the pause/abort command from LabVIEW Operator Interface? I tried using the FileGlobals.TestSocketExecutions array from the Parallel model (by setting "Shared at Run-time" flag), but these references seems to be changing constantly.
What I want to do is have a unique execution reference for each testsocket that can be obtained when the DUT is started/ even when the testsocket is spawned, store that reference in my LabVIEW code and use this execution reference when I want to pause/abort the testing in that particular socket from LabVIEW OI.
Thanks in advance,
Saranya

Saranya,
I assume (hope) that you are using the "Test UUTs" execution entry point in the parallel model. So it seems to me that you already disabled the "UUT Info Dialog", otherwise you would have blocking functionality which requires user interaction on the UI dialog.
Please look into the Parallel Model as well as the modelsupport2.dll sources (available as CVI project in TS model folder) how the synchronization is done there.
Hint: There is a queue....
Also, i hope that you mixed abort with termination. I highly recommend you to never abort executions.
Norbert

Sharing a communication object between test sockets

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