Part of the queue

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• Sequential simultaneous writing of the queue

  Hello everyone, nice day.

  I have what should be a very simple matter.

  I'm currently implemented a producer consumer-consumption-consumer architecture. (Loop acquisition > write disk acquisition > read data from disk data > display of the user based on the data.) In plain language, I have a created the data loop, a loop of these data, a loop of disc storage and a loop displays a user interface. (This isn't supposed to be a real-time application, and I am aware of the charge created by the writing and the reading of the disc). Just stick with me on this one.

  So my problem occurs concerning the second loop. This loop is responsible to write the data be queued (produced in the loop 'Acquisition') on the disk. The problem is also, feeds on a queue to the loop of "reading disc". This configuration causes a few obstacles. The main obstacle arising from the nature of queues of LabVIEW. The loop "write to disk" writes only a part of the queue of the 'Acquisition' at the same time. This general is not really a problem, until you consider that this loop also determines the execution of the loop of "reading disc", with the use of queues. As a result, this loop determines the rate of the next loop and was therefore likely to slow demand and leave a large number of items in the queue. In addition, you must keep in mind, I'm only queueing about 7 MB of data per element, and my HARD drive has a write speed average of 60 MB with a 64 MB cache. Therefore, my installation I can only write one item at a time, therefore making me use only 7 / 60MB of bandwidth from my drive.

  My question is; It be possible to have the loop "write to disk" write several items in the queue at the same time. I hope that I can write simultaneously enough items that I can use my bandwidth 60MO together writing and speed up execution of any sub routines that depend on data written to disk.

  I know there is probably best architecture for this application, but for the moment, I am limited to this architecture. If you have any suggestions for other architectures, I'm more willing to listen to, but coming back I am looking for a way to improvise simultaneous tail reads and then write them to disk with my current structure.

  Thank you all, thank you for the help.
  Taylor S. Amarel
  Learning is alive.

  You can put your element Dequeue function in a loop For and set N to a number so that you get several items from the queue at a given time.  Turn on indexing and you will have a table of data.  Write the table in its entirety on the disc.  This should speed things up a bit.  Don't forget to use shift registers for the sons of the error and the reference to the queue in the loop For and also put a little delay in the loop to stop 100 percent CPU usage.

• Queue a part of the "DialogRequestQueue".

  Hi, I'm developing in LV 8.6 a new operator Interface for TS. I want to emulate certain functions of the modelsupport2.dll.

  When the user presses the button start the IO should be given a new type of cluster ControllerRequest. I have developed a few screws in

  order queue and dequeue item in a line of TS, but they only work for the channel, digital and Boolean. How can I equeue who

  cluster?
  I went through the modelsupport2.dll, but I can't grasp the meaning. It changes the value of the cluster of ControllerRequest to help the

  TS_ProrpertySetVal and do not use the queue. Add an element to define the time-out occurred to false.

  Thank you for your support.

  Ciao Logatto,.

  If you want to be handed a cluster in a queue of TS of LV, first you must create a new PropertyObject with "PropValType_Container" as data type. In addition, you must add each element of the cluster as a new SubPropertyObject associated with the "main" PropertyObject

  The example you posted only created the 'main' PropertyObject associated with the container itself (i.e., a cluster of empy LV) without adding subproperties.

  I modified your Express.ypH by adding the creation of Subproperty in the code LV module. It should work fine now.

  Hope this helps,

  Fabio

• Buffer could replace the queue in the design of producer/consumer model

  Hello

  I have a question to which the task of buffer to store the data and the queue is also of the same thing so we could use the inplace queue buffer in a design of producer/consumer model.

  No, these examples of buffer not almost equal to a queue, and never "replaces" queue at the producer/consumer.

  The advantage the most important of the queues for the producers/consumers (which none of the other mechanics buffer sharing), it is that it works activities to warn the reader that the data is available. So if you would simply replace the queue by mechanics of tampon too developed that you have attached to your last post, you will lose a large part of the object using producer/consumer.

  Thus, to compare the two mechanics:

  -Tail works activities, while the example of the buffer is not.

  -Tail must allocate memory during execution if several items are written in that corresponding queue. This also applies to the buffer (must be resized).

  -Given that the buffer is actually simply a table with overhead, memory management becomes slow and messy with the increase in fragmentation of memory. Queues to play much better here (but have their limitations, there also).

  -Overload of the buffer (the table manipulation) must be implemented manually. The queue functions encapsulate all the necessary features that you will need. So the queues have a simple API, while the buffer is not.

  -Given that the buffer is simply a table, you will have a hard time sharing the content in two parallel running loops. You will need to implement an additional charge using data value references to manage the buffer or lose a lot of memory using mechanics as variables. Lose the memory, you will probably encounter racing conditions so don't think not even on this subject.

  This led to four '+' for the queue and only a single point where 'buffer' is equal to the queue.

  Hopefully, this clears things up a bit.

  Norbert

• What is a good way to use the queues for the model of consumers/producers?

  Hi all

  I am following the model of consumers/producers to use the queue to synchronize the following process: the producer is a loop to produce a number N, I will put each number generated in a table and after each 5 numbers generated, I put the table in the queue and pass it on to the consumer. I have to wait the use by consumers of the data and it will then remove the item from queue so that producers will have the chance to produce another 5 numbers. As I put the maximum size of the queue one, I expect that the producer and the consumer turns to produce / consume all five numbers and the opportunity to another. Here is my code

  

  When the checkbox is false, the code will be

  

  For the first 5 numbers, product will generate every thing right and put it in the table, and it's going to pass the array to the quere so that the consumer will have the chance to loop through the table. I except the procude loop will continue only when the queue is available (i.e. all items are deleted), but it seems that once the consumer starts the loop loop of the product will continue (if the indicator x + 1 and x 2 will be changed to numbers). But this isn't what I want, I know there must be something wrong, but I can't say it is.

  dragondriver wrote:

  As you say in 1, sequency structure to enforce the order of execution, that's why I put it here, in this example, the simple question, I replace the complete code with increase in the number, in the real case, the first markers + 1 and + 2 must be performed in this order.

  Mikeporter says:
  1. get rid of all the structures of the sequence. None of them are nothing but apply a work order which would have been the same without them.

  So even if you delete the sequence structure, there will be a fixed & defined order and it is because LabVIEW follows the MODEL of FLOW OF DATA.

  Data flow model (more precisely in the context of LabVIEW): a block diagram node runs when it receives the required inputs. When a node is running, it produces output data and transmits data to the next node in the path of the data stream. The flow of data on the nodes determines the order of execution of the VIs and functions on the block diagram (click here for reference).

  Now in your code, just remove the sequence structure will not make you order will be going to stay the same, but you need to do some very minor changes (as thread of the error in loop, before that he go to the node "Élément Dequeue").

  Come to the main point: it's a good way to use the queue for the consumer/pmodel that?
  The model you are using (and qualifying as consumer/pmodel) is much too deviated from the original consumer/pmodel which model.

  dragondriver wrote:

  For the second, Yes, it's my fault for delete, though. I'm actually the example of model of producer/consumer design pattern, but I do not pay attention to the while loop in the part of the consumer.

  While loops (two producers & consumers) are the essential part of this architecture and cannot be deleted. You can start your code using standard model.

• effectiveness of the queue

  So, I'm working on improving the efficiency and speed of my system of producer-consumer. I have two producers and a consumer (which, among other things, writes files to disk). I currently have two producers supplying the a queue which is then processed by my currently single consumer. Each item in the queue is a grouping of several types of data and contains everything you need to "consume." There are some cases where more complex queue items placed which take longer to treat and slow the process of consumption. I add a second consumer loop to run in parallel with the first to take the weight off the loop so to speak. My question is, it would be more effective to have both made consumers in the same queue, or would it be more effective to have each producer to feed its own queue. For the sake of the exercise assumes that I can guarantee you that the elements of the queue complex will come only from a particular producer.

  It is difficult to give a good answer without really knowing what is happening in your loop of consumer.  Order matter?  Some of these processes can actually be done in parallel?

  My first suggestion would be to make another loop (and corresponding queue) just for writing the disk.  Because that tends to be a "slow" process anyway, it should help releive your loop of consumption at least a part.  But, still, I do not know what that your orders 'complex' need you.

• the queue item will not dequeue

  I have some time that reads just a loop telnet connection data.  Channels fall on this topic and fit into a queue called him telnet.

  I have a separate loop which jumps out of this queue for the treatment of the elements.

  What I find is that there is some channels that get queued, but never stand to be removed.  Here is a screenshot of the enforceable part of the code:

  

  I put a breakpoint on the line item in the upper loop.  I then start a process that sends 2 channels via the telnet connection.  The upper breakpoint triggers and I see string1 to probe #12.  I still (i.e., click Pause) and I see string2 to probe #12.  Immediately after, the breakpoint around the outdoor structure case hit, but probe #11 has only 2 chain, never of string1.

  Am I not manage these queues correctly?

  Thanks in advance

  It is difficult to debug when you can see a part of the code.

  But your thread queue of telnet is splitting off and going to a third location all the way to the right and between the two loops.  What is happening with the wire of the queue there?  You have an other dequeue?

• Name of the queues, Instances of the Application, the appellants and this Proxy that I miss read from the help file?

  In a Word, I want to get a few clones of a vi a LabVIEW project reenterant.  Yes, I launch the Clones through CGRA and pass an integer in the clones to implement the queue named ("%d MyClone_")

  "Clones" seem to be the calling project.  The Hieriarchy view displays "Caller Proxy" for example "" MyReenterant.viACBRProxyCaller.<.int> ". And yet, NAMED to clone instances queues seem to have nothing to do with the clone named queues?

  SO how should I name a queue so that it can be passed in a specific clone of a vi that is part of the same project?

  Ah, your problem is that you use option 0 x 40, cloning pool, in addition to 0x80 for your ref VI open.   The reference you get is a reference to the clones, not a specific clone pool.  Thus, the clone of the real start is not the same as the clone that you place in the void Panel.   Change the options of REF VI open to only 0x80.  Then it works because each reference now points to the specific clone.

• Why the continuous measurement and Logging in LabVIEW 2012 Project uses strings instead of Enums and orders from the queue?

  Hello!

  I noticed that the continuous measurement and a project in LabVIEW 2012 Logging using chains instead of enums and orders from the queue. I wonder if there is a good reason for it?

  Kind regards

  Anguel

  First, string vs enum debate is probably the version of LabVIEW vim vs emacs. There are good arguments on both sides, and I doubt that there is always a "winner".

  A brief summary of our reasoning for the current state of the project examples:

  1. We used enums for the state machine because it is self-contained. A state machine will never tell himself to enter a State, he does not know. Knowing (as the programmer) all possible States with the help of an enum allows you to enlist the compiler in order to help us avoid mistakes to change the time (because you can't quite out an enum and LabVIEW can be said if you are not covering all cases to a structure of the case, etc..).

     Enums provide greater protection and rigidity by ensuring all withdrew at the time of publishing. This is often the 'default' recommendation that we do.

  2. We used strings for messages in queue manager because the producer of message and the message handler could be independent processes that are reused or traded. Channels avoid the need for the compiler to be able to connect the orders and push this responsibility to the programmer. This allows you to develop some sub-components independently as long as you agree to a series of channel commands that you can manage - you need not to share a file 'messages.ctl' or 'states.ctl '. It is conceivable a loop of message management a message it does not, how you can decide to either silently ignore it or will trigger an error (as we do in the model). The strings make it also easier if you want to swap the queues of LabVIEW outside by a TCP implementation for network vacilitate or intra-Processuse communication where the other end may or may not be written in LabVIEW.

     Channels to provide more flexibility (that is, you can add new commands to an existing via plugins system, you can pass parameters as part of the string, etc.) at the expense of pushing her potential errors at run time and to put more responsibility on the programmer.

  3. The actor's gifts frame a 3rd option - using classes such as messages. For me, it combines many of the advantages of these two enumerations (strictly typed, change errors) and strings (flexible and scalable), but with the disadvantage of being somewhat less transparent (you understand OO, be comfortable to navigate through a multitude of screws, legacy of understanding, etc.).

  I don't know there are other reasons, others to the breast OR had or seen as we validated models and examples of projects in-house, but here are my reasons. We know that we can not design for each situation there - our goal is to get useful models against new users to make them aware of what well thought LabVIEW programs are similar to experienced users know their applications better and I hope they do not hesitate to change what we provide or create their own designs, when they feel it's necessary. (On a side note, please share what you come up with - a community of experts sharing models would be really useful to us all LabVIEW users).

  Best regards

  Simon

• indicator light flashes, but there's no docs in the queue; Cannot print

  I have a Color LaserJet CP1025nw printer.  The 'ready' light has been constantly flashes throughout the day.  I can't print anything of any program.  It seems that when I try to print, everything goes smoothly, the doc still appears in the queue of print with the status "printing" but nothing no is displayed. So I canceled all documents pending, so that there is nothing in the queue, but always flashes. Flashing must indicate that the printer is receiving or processing data, but there is no docs in the queue.

  I tried to turn off the printer, wait 10 minutes and turn it back on again; also tried to restart the printer and the computer. also made sure all the cables were connected the printer to the computer; also tried opening and closing the upper part and he had to scroll through all the lights; also crossed the convenience store help and tried to print at a command prompt... nothing has worked so far.

  Help!

  SOLVED!

  Thanks to an old post here, I learned that I could try to do a hard reset.  SO I did a hard reset and the printer works now! Perhaps there was a doc stuck in the memory of the printer and it could not go beyond it?...

  For the hard reset, while the printer is turned on, unplug the power cord and cable, wait at least 30 seconds, and then plug them back in and turn on the printer.

• network is detected for c7280, but print jobs are sitting in the queue and will not be printed

  The first time in the forum because C7280 is no longer supported. Lasted forever except that updates always seem to bumble. Last update caused printing to sit in the queue instead of actually printing.

  The network is detected thanks to a response I've read similar problem, someone else had. I disconnnected cord power, then pressed on # and 6 at the same time. Network connection is returned after this reset. Thank you for this!  But now this second question described in the first paragraph.  We believe that it is a software problem in the updates.  Any suggestions?  Thank you!

  Ok! Error of the operator on my part! Upon reflection, I realized that the rest of the House is on wifi, our main computer is NOT. Before our disassemble everything, we had the HP hired cable! So, everything is back to normal. Thank you very much for your kind attention. We have still benefited from the previusly information obtained when wifi was not recognized at all, so all is well in the household and everyone is happy now!

• Identification of the queues to officers on IPPhone

  Hello, what can I do so that when an agent, which is part of several queues, answering a call in the queue, they can see which queue is that they meet on their ipphone? We only use agents ipphone. At present, the cti port number is displayed. I prefer to have it display the cti route point or ideally a name, for example, the queue of WAITING of SERVICE... Please advise...

  This URL is the information that you are looknig for:

  http://www.Cisco.com/univercd/CC/TD/doc/product/voice/sw_ap_to/apps_3_1/English/admn_app/cra_adm/prov_icd.htm#1030484

• "Ready" printer, 1-0 in the queue but nothing printed queue &gt;

  Cable USB all-in-one, HP PSC 1410 printer, XP

  The printer displays 'ready', when I print a document, the printer makes a noise, watch 1 document in the queue for a second and then NOTHING - goes back to 0 document in the queue and nothing is printed.

  I have downloaded and tried HP Scan and print doctor 4.5. Photograph of Go thru that and "Printer problem", same problem when I go to test a page.

  I tried to close all to down and reboot.  ??  Help?

  Hey @planejanea ,

  Thank you for taking time in your day to ask this question on the HP Forums today!

  I see that you are having problems with the queue on your printer software. You have downloaded and ran the print and Scan doctor and still no solution.

  I would like for you to try a uninstall/reinstall and see if that fixes the problem.

  Uninstall markets - uninstalling the printer software

  Installation - install / uninstall software & drivers

  Let me know after you complete these steps and try to print. Can't wait to hear back on your part.

• Part of the transaction triggers consistency?

  I have a simple named cache to which I attached a trigger that publishes the object to the queue of Tibco. I do not use any transaction here. My question is could it named cache and the process of part of the same transaction trigger method, i.e. If my failure of connection of Tibco will be be save to cache or not?
  
  Lets say in the trigger process method I'm writing throw new RuntimeExcetiion() is always saved in the cache?

  Hello

  We use exactly the same template in our system to push messages to Tibco when caches mutate. If you throw an exception from a trigger then the underlying cache doesn't change.

  JK

• How to select a part of the message under macOS Sierra?

  In previous versions of Mac OS x, I was able to select a part of the message (text / iMessage) in the Messages application. Now, if I try to do the same, Tapback is enabled. It's really annoying, as I often have to copy the entire message body, paste into an editor and then to do the editing.

  Which should not happen if you simply select the text of the message by double-clicking or click-and - drag. That action works the same way it always has.

  Tapback happen if you press and hold - in other words, if do not quickly move the cursor.

  If you are still unable to work, please review your Trackpad preferences. Maybe change a setting arbitrary will correct what you are experiencing. Check accessibility > mouse and Trackpad in the same way: change a setting to determine if what it fixes.