Parallel model questions

I have a few questions about how to implement a parallel model multi-socket test.
So, we have a test board which is controlled by USB (1 per board).
I have developed a VI based test sequence, that runs fine in a single mode.
Now i need to rconfigure this to use 2 sockets to run 2 iidentical test simultaniously (asynchronous)
A few things are unclear to me in the implementation:
1. Are the variables common to the 2 instances, or separate? For instance i use a local which is the handle to the comms for that board, but do i now need a different local variable for each socket? If yes, i dont see how that would be implemented, because the variable is specified in the sequence.
2. How to define constants that will apply only to one or other of the sockets (i.e. the board usb port)
3. Is it really multi-threaded? i.e can i call the same VI in 2 instances?
Labview 2010, TestStand 2010

Hi,
1. Do you have one resource or you multiple comm ports?
2. You can use the Socket index to get the correct data, off course you would have to use an array to hold this data. If handles are not from a shared resourse then there is no need for any special consideration. Each Socket will be totally independant of each other. Its only when resourses are shared that you need to make sure each socket is not trying to use it at the same time.
3. Providing VI are re-entrant then you can multiple instances of a VI in memory. Otherwise you would have to use synchronization so that you can share resourses.
Regards
Ray Farmer

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No, Below is a bit from the Session Manager Help
Currently, Session Manager supports the following instrument session types:
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A special Rendezvous that works on subsets of processes in the parallel model

I have a parallel model test that works great on 14 UUTs so far, but now I must write some sequences where the processes have to share hardware two at a time. I need to pair up the processes like (0,1), (2,3), (4,5), etc. and have a Rendezvous operate on them two at a time like this:
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bmihura wrote:
OK I tried your pairing up idea with six processes (three seperate Rendezvous, one for each pair), but they all still ran in parallel. I'd like for one pair to execute at a time while locking out the others. This is because my system has two electronic loads (and two of many other things) that the six UUTs must share.
Ok, then what you proposed before (a separate rendezvous for each pair of threads) is not the correct way to synchronize things. A rendezvous just causes threads to block until the specified number of threads reaches the rendezvous point. You have three independent pairs of threads running in parallel. If that is not what you want, then using rendezvous like this isn't the right approach.
Please describe in more detail the entire flow of execution you are looking for. At what scope do you want the other threads to be blocked? Do you want each pair of threads to run all tests before any other threads can run? Do you want this only around certain steps? or Group of steps? Also, why do you want the threads to be paired? The most straightforward way I can think of to allocate two of a resource is to not care about which thread is using it, but to only allow two threads at a time, they don't necessarily have to be in pairs or even the same two threads every time. Do you really need the threads to be paired?
One of the simplest TestStand specific ways to allocate resources is to use the auto-schedule step types. They allow you to define blocks of code which require specific resources and then automatically run those blocks of code when those resources are available. I recommend you read the documentation for these step types and see if that sounds like it will work for you.
Another relatively simply way to synchronize access to a fixed number of resources among many threads is with a semaphore. A semaphore allows a certain number of threads through at a time, and blocks other threads until one of the ones using the resource release their acquisition of the semaphore. If the resources involved are more complicated though, I think you are better off using the auto-scheduler step types.
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SequenceFileUnload in TestStand 4.0 Parallel Model

Has anyone experienced a problem when updating to TestStand 4.0 with the SequenceFileLoad and SequenceFileUnload callbacks? I’m using the parallel process model configured for 8 threads and in earlier versions of TestStand have had no problems placing my hardware initialization steps in the SequenceFileLoad callback and the cleanup steps that release hardware references, in the SequenceFileUnload. It seems very random that sometimes when I close my sequence, the Unload steps are executed. Sometimes they only run if I select File->Unload All Modules or close TestStand.
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Most of the time people do this in the Process Setup Callback and Process Cleanup Callback. Those are process model callbacks that you can override from your client sequence. They are probably better to use than the engine callbacks (SequenceFileUnload and SequenceFileLoad). They get executed before and after the looping respectively.
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I am using TestStand to control test execution in a thermal chamber. I am unsure which process model best suits my needs (sequential, parallel, or batch). My requirements are as follows:
Up to 4 UUTs will be tested using a single test system. Each UUT shares assets in the test system. An entire sequence of tests will be run repetitively on each unit for a period of 24 hours. Within the 24 hour period, a single control signal is received from the thermal chamber indicating when tests should be run. (run for two hrs, soak for two hrs; run for two hrs, soak for two hrs �). Typically (prior to using TestStand) the test controller would run all tests on UUT#1, then all tests on UUT#2, then all tests on UUT#3, and so on. At the completion o
f this cycle, testing for UUT#1 would occur again. Each UUT has its own data report generated.
I know the parallel process model allows for the removal and/or addition of UUTs at any time during the test sequnce. Although that is a nice feature, it is not a necessity.
I would appreciate some advice on how to handle this situation. How can I affect the �infinite looping� of an entire test sequence for this multi-UUT environment?

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in the TestStandI course they stated that the serial model is for serial testing of one UUT after the other. The parallel model could somehow be assumed as multiple serial models running in parallel. The batch model is somehow inbetween or extra. It handles the test of a whole batch of UUTs in parallel, where there are some things to be tested in common.
Of course everything can be coded in every process model, but this would give up a lot of the built-in comfort.
In your case I would choose the parallel model, except there are some steps that need to be done on the whole batch at the same time. Consider some UUTs that must all pass a voltage test where you have just one DMM, and must be cooled down when all are done. This would be a batch model.
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"Batch Synchronization" in Parallel Model

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I'm working on a project with up to 15 UUTs which are supposed to be running using the parallel model, since they have to be able to start and stop separately.
There are conditions in which all active UUTs are paused and restarted upon request. Communication with the UUTs is established using a single demon. Now I need a synchronization method, to make sure only one thread runs the daemons initialization. Just like a batch synchronization using the "One Thread Only" option.
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James,
thanks for the reply. I guess I can implement sth like you suggested. Was just wondering, if I'm missing some built in option that saves me from tinkering myself.
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This is my first time posting, but I am a long time reader....
First off, I would consider my Teststand knowledge level as high novice to low intermidiate. I created a test sequence using in Teststand which calls labview vi's. My test sequence tests 5 units at a time in a parallel model (parallel model sequence). Functionally, everything runs great in single pass and looping. However, here is my issue:
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Solved!
Go to Solution.

No problem Ryan,
When you are done here you will be a pro.
Here is a link that talks about callbacks and how overriding them works: http://zone.ni.com/devzone/cda/tut/p/id/6605
The PreUUT will be a Model Callback.
One thing I should point out- There is a huge difference between the Batch Model and the Parallel Model. People tend to get them confused and sometimes use the wrong when the other one is a better fit for their architecture. They way I think about it is like a race track. Each car on the track represents a different test socket. One time around the track represents a full test. Pretend the race is completed by teams of cars. Each team can only race one car for one lap (sorta like a relay). The team would represent the available test fixture for the next UUT and the car would be the UUT. Here's how the race would work with each model:
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Parallel Model- In the same car scenario as the Batch Model both of the team's 1st cars would line up and the gun would go off and they would go. However, this time if team 1's car gets around the track they can immediately send their second car without waiting for Team 2's 1st car. In fact all 5 of team 1's cars could be finished before team 2's 1st car even finishes it's lap.
Not sure if you are a fan of analogies but they work for me. In short-
Batch Model- Everything in that set of test sockets must start and stop at the same time.
Parallel Model- Each test socket is independant of any other test sockets.
I'm picturing your scenario where you have 5 different stations that will be running independantly of each other and trying to figure out if you would want the Batch behavior or the Parallel behavior. Or..... Why wouldn't you just use the sequential model on each station and deploy your sequence to each station? Maybe you can describe your setup in a little more detail and we could come up with a better solution.
How does the one station know that the others have the Go button pushed?
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CTA, CLA
teststandhelp.com
~Will work for kudos and/or BBQ~

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modalpopup.seq ‏6 KB

Hi dseel,
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TSErrorMessage.jpg ‏56 KB

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