The use of queues for the buffering

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• 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.

• Size of the queue for Signal form write XNET

  Hello

  I am using the XNET library to play a preset on an output signal waveform. I work with LabVIEW 2014 SP1, 14.5 XNET on a W7 Pro 32-bit operating system. I use an NI PCI-8512 map. This is my first app using the xnet library.

  In my test application, I give the user the ability to set the waveform to play. The total duration and the sampling frequency can be set. The output MAY report is cyclical, with a cycle time of 0.01 s (10 Hz). I chose to use the same frequency for example my wave form and writing of the CAN.

  I have difficulty working with the size of the queue. In this example, it's good but I did not really why. I tested different values in the size of the queue and 100000 seems to be good up to 60 seconds. But for the longest (about 5 minutes), this method is not good...

  

  What is the right way to work in this mode and how use efficiently the property size queue? Information and example of using software and hardware OR XNET are not very convincing...

  Thank you in advance!

  You can add several items at the end of the queue until the queue is empty.  So if you want to write 10,000 points, and your buffer is only 1000 points, then wait and monitor the number of messages remaining in the buffer, and once it is less than 100 say adds an another 900.

  I used this method for flashing on CAN and LIN.  I needed a way to watch specific at specified times images, and a single point of frame link would not repeat (which could write the same byte twice what would be bad) I could have made the rivers and used avoiding, but a better solution was to use queue and add more pictures at the end of the queue to try to keep it as complete as possible.

• How to increase the value of the queue for a server to avoid errors

  In the RESOURCES section of a config of ubb, "MAXQUEUES 700" stand for all servers queue or queue on each server?
  
  Because there are a lot of "ERROR: the Message Queue blocking warned childbirth, Qaddr = 583902 ' for a server in ULOG, what should I change the value of the queue of this server to a higher value to avoid this error? Change the "MAXQUEUES? If increase the queue for a server?
  
  Thanks for your kindly reply.

  MAXQUEUES is used to specify the maximum number of queues - not number of messages on a queue of (each).

  To solve your problem of blocking, you might consider adding servers (to accelerate the responsetimes).
  Another option could make synchronous calls if it would make sense for some application that you design.

• Size of queue for the server reports

  Hello
  
  How to increase the size of the queue for our reports, good that now it shows only 1,000 records.
  
  Thank you
  Sanjay

  Hello Sanjay

  As an option. You can have a maximum of a single element of the queue in the configuration of your server. If you have nothing in the queue, the default value, 1000, will remain in force.

  The queue item to specify the maximum number of jobs that can be held in each of the queues of reports. Reporting Services OracleAS components three of the queue:

  a queue of scheduled tasks

  a work in progress queue

  a queue of tasks completed

  The queue item provides the value allowed for each of these components.

  This element applies only to the work queue. Thus, if the number of jobs is greater than the specified maximum value, this work queue automatically purge his older works. Planned work queue, and the queue of work in progress are not affected. By default the reports server queue size is 1000 jobs.

  If you increase the size of the queue at more than 3000 and use reports (rwrqm.exe) queue manager to monitor the queue, the queue manager may fail. When a queue of 3000 or higher is necessary, use Oracle Enterprise Manager 10 g or reports Servlet (rwservlet) to manage and monitor the queue of jobs to report server.

  Configuration file is located in $ORACLE_HOME/reports/Server

  Kind regards
  Myth

  Published by: myth on July 7, 2010 11:09

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  A problem that results is firefox remember now username and password on a new gmail account.

  The problem started with the latest revisions to Firefox. In the past, I've saved usernames and passwords on multiple accounts gmail without problem.

  As a result, I had access to the gmail accounts in another browser to save all my gmail account IDs and passwords.

  Any suggestions on how to remember passwords and usernames gmail again? and/or get "Use Custom setting for the story" to work? Thanks for your help

  I had the same problem this is how I solved it
  Tools > options > saved passwords > locate the corresponding site, you will see that the user name is missing highlight and delete.
  Back to the site log in enter your password and you will then be asked to save it... That's fact

• TomTom map is wrong in vietnam, pls use google map for the ios update, thank you

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  We are fellow users on these forums, not support nor Apple iTunes.

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  I'm trying to select several images (Forms), but I have not found a selection tool. This selection tool to transform the mouse cursor in an arrow and it is possible to select several images or figures. I use Microsoft Excel for Mac 2011 Version 14.5.3. Thank you!

  tupensi wrote:

  use Microsoft Excel for Mac 2011 Version 14.5.3. Thank you!

  Then you should post on the Microsoft Mac forums where to hang out the gurus of the Office, as is the Microsoft product, with that you are having problems:

  http://answers.Microsoft.com/en-us/Mac

• Use of 'root' for the system volume is 100% and/dev/md0 is full

  Hello

  I recently started to receive notifications that the use of 'root' volume of my system is 100%

  I went through all the files and it seems that the culprit is/dev/md0

  I don't have any add-ons installed, and this NAS solution is specifically used as a backup to another NAS. It uses ReadyNAS Replicate for backups.

  Here is the output of df - h and df - i

  

  I tried commands like this:

  du - csh/var
  du - csh/var / *.

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  Can someone help me solve this problem?

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  When you have looked at the system, the data volume has been mounted. There was data under/data on the partition of the OS, but could not say that.

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• The use of DAQmxWriteDigitalScalarU32 for write channels share the same ports?

  Hello

  I have a USB-6509 and NOR-DAQmx installed 15.5.1. Using the ANSI c api.

  Is it possible to create several independent channels that use different lines of the same port?

  DAQmxCreateTask("",&th1)

  DAQmxCreateDOChan(th1,"Dev1/line0:4","",DAQmx_Val_ChanForAllLines)

  DAQmxStartTask (th1)

  DAQmxCreateTask("",&th2)

  DAQmxCreateDOChan(th2,"Dev1/line5:9","",DAQmx_Val_ChanForAllLines)

  DAQmxStartTask (th2)

  ....

  and repeat for the following strings:

  Dev1 / line0:4
  Dev1 / line5:9
  Dev1 / line10:14
  Dev1 / line15:19
  Dev1 / line24:28
  Dev1 / line29:33

  So I can use DAQmxWriteDigitalScalarU32 to write to each task independently?

  for example:

  DAQmxWriteDigitalScalarU32 (th1, 1, 10, 0 x 1, NULL)

  DAQmxWriteDigitalScalarU32 (th2, 1, 10, 0 x 2, NULL)

  DAQmxWriteDigitalScalarU32 (th3, 1, 10, 0 x 3, NULL)

  ...

  DAQmxWriteDigitalScalarU32 (th6, 1, 10, 0 x 6, NULL)

  These tasks will interfere with each other because they use the same port, but are assigned different lines?

  If this isn't the case, I bits to the data, if the task/channel does not start at the Px.0 line?

  Thank you!

  Yes, as long as you use the same line on different channels, they must not interfere with each other for this reason, you can create a channel by line if you wish

  The reference to using the DAQmxWriteDigitalScalarU32 function:
  "A sample of the integer unsigned 32-bit unique, wrote to a task that contains a single digital output channel. "Use this format for devices with up to 32 lines per port.

  http://zone.NI.com/reference/en-XX/help/370471AC-01/daqmxcfunc/daqmxwritedigitalscalaru32/

  So yes, the DAQmxWriteDigitalScalarU32 can write on each task independently

• What is the algorithm/method used by Diadem for advanced research?

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  Can you please let me know what method/algorithm is used by Diadem for advanced research? Please note I am familiar with search function of DIAdem peak, but I need to know the theory/algorithm it uses to find the vertices.

  Thank you

  Hossein

  Hossein greetings

  Verify the last paragraph of this document.

  Let us know if this answers your question or if you have more information on this subject. Good day!

• TreeSize Professional - using this tool for the first time - need help to run the report

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• Use two assistants for the acquisition of data at the same time

  Hello

  I want to read multiple data channels of analog inputs on my DAQ hardware. However, when I try to create two separate data acquisition assistants for each entry, it gives an error saying "is reserved for the specified resource. The operation could not be performed as indicated "." Can't use two assistants for the acquisition of data at the same time?

  I have to add different channels in the same assistant DAQ? I tried, but I couldn't separate the data in different graphs.

  How does this work?

  Kind regards

  Allard

  You can't have multiple tasks of the same type (in this case inputs analog) on the same device.  Just so having 1 DAQ Assistant read all your channels and separate your channels for individual transformation.