Abandonment of a loop timed - what happens?

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• What happens when DAQmx - searches read more timed period loop?

  Hi all!

  I'm not sure how Labview manages the following situation:

  I have a loop that is timed with a period of 1000 m, it is configured to ignore the lost iterations and keep the initial phase. I created a task that needs to be read continuously at a frequency of 1 kHz. In the timed loop, there are the DAQmx - read function (analog signal, 1 channel, N samples)

  Now, if I put the number of samples per channel at 1500 for example (while it takes 1500 * 1 ms = 1500 ms > timed_loop_period to read), I noticed that the timed loop takes ~ 1500 ms to complete. The same phenomenon occurs with any other number greater than the period of the loop.

  This means that the period of the loop passes to 1500 ms? Or something different?

  Thank you!

  Best wishes

  Samuel Lopez Santamaria

  You go winding with an iteration of the loop of 2000 msec.

  An iteration of the loop will always be until he has to do.  If you tell him to keep the first phase and it works for a long time, then it will wait until the next 1000 msec happen before going to the next iteration of the loop.

  Now with your situation, later iterations cannot take it any longer.  If you are permanently data acquisition, DAQ mx buffer fills while the loop is still pending.  So when he runs again, there may already be 500 msec value of data in the buffer, and he just needs to wait another 1000 ms up to what you have acquired the total of 1500 milliseconds of data you have requested.

  The situation for the third iteration of the loop will depend on whether the other was done within the 1000 msec, or ran just a bit long.  It behaves more like the first iteration, or the 2nd iteration.

  My question is why you use it timed while loop?  What characteristic of it you need that a regular while loop is not?  I think that mixing and matching the characteristics of a timed, while the loop with your DAQ acquisition will cause a continuously variable behavior time loop which is probably not what you want, or could cause you problems down the road if you're trying to do is to get the continuous acquisition of your DAQ hardware.

• What happens if my computer cannot process a pretty quickly timed loop?

  If I created a loop timed, but required that more important than my computer treatment is able to do before the next iteration the tasks within the loop, what happens?  It gives me an error or I miss loops?  In the end, I need to know how can I know if the problem occurs.

  Please see the setting the Mode of a section of the loop timed in the following document.

  http://zone.NI.com/reference/en-XX/help/371361F-01/lvconcepts/configuring_the_labview_timed_loop/

  The left consider the following section describes the information that you can access on the previous iteration of the timed loop.

  http://zone.NI.com/reference/en-XX/help/371361F-01/Glang/timed_loop/

• Loop timed in LabVIEW DLL does not close

  Hello!  I have what I think, it is a simple loop timed in LabVIEW that stops after 100 iterations by throwing an error and letting the loop 'stop on error.  It works fine when it is executed in the ordinary LabVIEW environment, however, when compiled as a Dynamic Linked Library (DLL) and called from LabWindows it requires me to put an end to execution, rather than going out nicely.  As well, it seems to leave the real appeal of virtual Instrument very well and go to the next line of code, but when my function main() in LabWindows is completed it must always be something not cleaned which is the cause not come out well.  Any ideas?   I tried to add only a call to QuitLabVIEW and that doesn't seem to do it.

  Thanks in advance - hoping you will notice an error really easy. )

  A photo of the timed loop is attached.

  An excerpt from the code of LabWindows:

  int main)
  {
  CallMyLabVIEWDLL();  This line launches successfully and closed the window for my virtual instrument LabVIEW
  MessagePopup ("' My Title:", "That occurs after the call to your LabVIEW DLL" ");    This popup appears - indicating the call to the DLL has finished

  But after the code has completed LabWindows always shows "running", rather than close.

  return 0;
  }

  Why do you use a loop timed in the windows environment?  They are best used for real-time environments (not windows) and tend to have more support than the time.

  Is there a particular reason, a while loop will not work?

• What happens if several consumers - whose architecture SW should I use?

  There are several models of VI and documentation on the producers/consumers type aqrchitectures

  I have some experience with LV, but limited experience with multi-threading programs and events.

  My question is what happens if the consumer also produced data? ... the tutorials do not really extend to it.

  In my application, I have 3 USB CAN transmitters and a NOR-DAQ.

  I intend to have loops or threads for each multiple hardware device at the lower level.

  There will be a loop of the UI (producer) and a "test step sequencer" interpret the activity of the façade and send commands to the hardware devices to take action or perform a measurement.

  My main problem is what is the best method/practice of transmission of data to the 'test step sequencer' material once the acquisition is completed?

  Do you use the same queue to pass data back (for evaluation of success/failure analysis and test) or any other method.

  This might work.

  A difference between the Registrant and the queues is that with queues, you can be sure that the loop of consumer gets the message (assuming that there is no problem with the producer generating and sending).  Even if the consumer is busy doing other things, the message waits in "inbox" of the consumer until he is ready to read.

  A notifier, there is no guarantee that every piece of code that expects a notification will get all messages.  Think that the declarant is a whiteboard.  A message to put out there for anyone interested to read.  But when a new message to be sent, the sender is declined, clears the Board and writes the new message.  If someone who is interested in messages has been busy and you can't go to the Commission while the first message is there, it will never see the message.

  If you want to ensure that each loop gets all their messages, then just a queue for each loop that behaves like an Inbox.  If you need to send the same message to several loops, then queue the data in multiple queues.  If you get a message back, enqueue sending loops reference to queue in the data (self-addressed stamped envelope).  (you can also put a Boolean value in the cluster that could be an indicator as to whether the 2nd loop should send something again or not.)  If you need the first loop to wait for the return data before you go, then he's waiting in the queue.  But you can use the time-out function so that it is not wait forever for something that never comes back and integrate logic into your program so that it can handle this situation (doing nothing, resend the message, open a session, or displays an error message...)

• What happens when "Still waiting for network when starting the computer and logon" is enabled and that the computer is not connected to the network?

  In MMC, I created the group policy and found through web search that computers with mapped network drives can connect better if "always wait for network when starting the computer and logon" is enabled...  So far, it has been very nice to have allowed.  Is no longer mapped network drives see the place as disconnected.  But what happens if the computer is not connected to a network?  Say the wireless router will turn off and your computer always 'wait... '. "turned on, should the user could still log the computer timely?

  Check these:
  Troubleshooting intermittent slow connection or slow start of http://blogs.technet.com/b/instan/archive/2008/04/17/troubleshooting-the-intermittent-slow-logon-or-slow-startup.aspx
  Priority and group policy processing
  http://TechNet.Microsoft.com/en-us/library/cc785665%28WS.10%29.aspx

• What happens if I disable the processor in Device Manager

  I see 2 processors in Device Manager. What happens if I disable the processor in Device Manager

  Hello

  Since you say that it works perfectly in safe mode, I think that there is a problem with a driver or an application causing this boot loop.
  Please see this thread with details exactly what a clean boot is and how to use it to solve the problems of this kind. The idea behind a clean boot is to identify the exact cause of the problem so that we can fix or remove the troubled application.
  http://support.Microsoft.com/kb/331796

• What happens when JOINT-2 performance is exceeded

  Hello

  We have JOINT-2 with about 20 pairs of vlan inline in the test environment. What happens to online traffic ourselves, said a flow of 500 Mbps? Falls of traffic or is it transmitted without IPS inspection.

  If you exceed the capacity of the sensor monitoring, then the packets that cannot be monitored will be abandoned by the sensor.

  NOTE: 500Mbps isn't a number of absolute performance for the sensor. It's a level of performance that the sensor has been testeed to be able to manage for certain types of traffic used in the performance test. We don't know exactly how much traffic the sensor will be able to manage to your network. The JOINT-2 will probably handle around 500 Mbps is a lot and even most customer networks. However, the networks vary, and in some networks, it can handle quite a bit less traffic and other networks can handle even more.

  So the question is not what will happen if you send more than 500 Mbps, but rather what will happen if you send more traffic than what the sensor is able to monitor. And the answer is that all traffic that cannot be monitored because of the limitations of performance will be dropped by the sensor.

  The only time where the packets are forwarded without inspection is if sensorApp has ceased to monitor all packets (a reconfiguration or an upgrade is in progress, or the process of sensorApp crashed) AND the functionality of the software workaround August kicks. Which case all packets will be forwarded without analysis.

• Profile of user not in dba_profiles. What happens to PWD security?

  Hello

  I don't know exactly how it happened, but I have users in dba_users with dba_users.profile values that do not exist in dba_profiles. For these users, what happens in a perspective of security password?

  Thank you

  ponderdj

  is ponderdj, what version of Oracle?  With the help of a 10.2.0.5 system for test, I determined that Oracle does not allow you to create a user that references a non-existent profile in create it or if it let you change a user in a non-existent profile.  So I create a new profile, new user referenced the profile, which then attempted to abandon the profile.  Oracle has refused to give up the profile since it was used unless I have clear WATERFALL.  I've made and then checking the DBA_USERS entry for my test user.  The information had been updated to display the DEFAULT profile has been used.

  - -

  If I get a chance I'll try this on one of my 11.2.0.3 systems, but I expect the same results.  I don't know if I have a reference anywhere, but Oracle used to have a dictionary check script that would search for and identify problems in the RDBMS database tables.  A research on support may be worth your time.

  - -

  HTH - Mark D Powell.

• What happens to dynamically declared variables when I'm not with them?

  Hello, I'm doing a game using Flash Pro cc. But I wonder what happens to the article, that is dynamically declared variable MovieClip in a loop. And every article gets the EventListener 2.

  for (var i: Number = 0; i < pVector.length; i ++) {}

  var aTile:ATile = new ATile();

  aTile.x = pVector [i] .x;

  aTile.y = pVector [i] there;

  aTile.gotoAndStop (Math.ceil (Math.random () * Color));

  nVector.push (article);

  Spr.addChild (article);

  aTile.addEventListener(MouseEvent.CLICK,Clicked,false,0,true);

  aTile.addEventListener (Event.COMPLETE, false, 0, true);

  the current function ends here. What happens to the article now? It will be garbage collected? Moreover, this piece of code runs whenever a player starts a new level of my game. And I do not have the use of the variable article in other functions. I only use the nVector variable. And declare a dynamic variable in a loop means a multiple of them are created? For example, if the piece of code above loop 5 times, means 5 article variable are created? Or whenever you declare

  var aTile:ATile = new ATile(); Once again, it replaces the 'old' with the 'new' article article and so 1 only article exists after the loop?

  }

  need no gc d because it seems that it is added to the display (but it depends on if the RPD is added to the display).

• What happens to resources when a program ends and garbage

  Hi all
  Could someone tell me what is happening to resources when a program ends?
  Resources such as a "java.sql.Connection' or a 'java.nio.channels.WritableByteChannel" close automatically when an application ends?
  
  Also, is there some kind of garbage collection that takes place? According to Effective Java 2nd edition point 7, "it is quite possible, even likely, that a program ends without running finalizers on objects that are no longer available." What happens then?
  
  Thanks in advance!
  
  Published by: Jujubi on April 12, 2012 10:36

  As stated above, you must always closed no matter what output buffering stream or writer yourself, otherwise you will lose data. You must close the database connections yourself, otherwise you get a commit or abandoned according to you and the seller may not so get the one you want. (You should be close connections to DBMS inside finally blocks actually and using a pool of connections, not held on them forever.)

  There are a few resources you do not need to clean: you don't need to have windows of Swing, for example, and you have not and cannot have MappedByteBuffers.

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  Mac mini (mid-2010), 2.4 GHz Intel Core 2 Duo, 8 GB of memory, running OS X El Capitan 10.11.6

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  It is said...

  • Mac mini (mid-2010 or more recent)

  See Configuration hardware Mac here > http://www.apple.com/macos/how-to-upgrade/#hardware-requirements

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