network flow

Similar Questions

• Where the range of network flow in LabVIEW 2010?

  I know that this palette "exists" (since I can with the right button on a thread of endpoint and network flow Palette appear in the menu), but (so far), I have not found on the pallets of LabVIEW 2010 function.  Where is it hidden?

  BS

  Under the "Data Communication" on my machine.

• Loss of data for the network flow

  I have an application where I need a chassis CRIO 9068 stream to a PC, and I'm running into some problems with data loss.

  The CRIO is sampling data, put in a picture 2D tanks (the size depends on the number of channels and the sampling frequency) and it streaming on the PC.  Data loss is not consistent, sometimes no data will be lost. Also the size of the array be listened to believe makes no difference, sometimes I won't lose data 24 channels 25 kech. / s, and sometimes I'll lose data 1-channel 10KS/s.

  The VI (host PC) runs in a non-timed while loop, it runs generally to about 50 Hz, sometimes hiccups system will make it slower for a loop or both.  Wirte CRIO loop runs at 20 Hz.  I think that the loss of data occurs when the PC has an if its hiccups, I know well that the size of the buffer to the stream network could absorb these hiccups.  If I make the size of the buffer is bigger, I seem to have a memory leak and the CRIO crashes after a few minutes.  I have also the CRIO record data directly without streaming, and no data is lost here, so I know its disappear somewhere in the stream.

  I also have a separate Standard TCP connection between for command and control, do not know if this could cause an interfereing with the network flow problem.

  I have attached photos of the screws where the endpoints are creadted and where data is written and read.

  I'm using Labview/RT 2013

  Thank you

  Suggestion of the AGJ is a good thing.  I had trouble keeping your code - there were so many things with wires everywhere...

  I have an application that runs on a PXI-8106 controller streaming 24 channels of data collected at 1 KHz (or 24K s/s).  He gets streaming via network to the host computer and from there flows streaming to disk.  At the same time, I'm streaming "Events" (transitions State, DIO line changes, etc.) to another stream from network to another data file.  A key step is that the data is off the network stream, they are put in a queue for sending the disk.  There are several parallel running loops, and I never lose a sample (I can tell because one of my channels is a "clock", the index of the loop timed running on the PXI system that produces the data that is sent to the host through the network stream - I can inspect this channel and see that each point is different from the previous one by 1).

  Do you use queues to stamp your data in and out of the network stream?

  BS

• network flow affect the performance

  Hey guys,.

  I had a set flow network implemented to tranfer a lot of data in my cRIO 9068 to my PC to save it.

  Now, I noticed a decline in the RT performance when tranfered by the network flow data were big enough. I'm talking about the tables with size about 5 MB here. My goal is to transfer bigger tables across the network with the performance of the CR flow not be influenced.

  The program is built with 2 loops.

  A loop to the network stream, the other to simulate the controls.

  The two loops are timed with 10 Hz.That of the frequency necessary for controls.

  Usually each dataset happens to my PC. The drop in performance, I've mentioned before, I noticed that when a signal generated by the RT generated test becomes rough.

  Can't find anything about it in the forum. Can someone help me?

  Thanks a lot!

  Max

  Hi Max,.

  Why should you change your image before downloading? At least the text is hard to read...

  You want to listen to 5 bays MB with a 5ms interval (which is 1 Gbps!)? And then, you're really asking about the high on the cRIO CPU consumption? Really?

  Is your 'size' number of items or really memory footprint?

• network flow - how to get the URL of the remote endpoint?

  Hello!

  I have a project running with a host to send messages to a target of RT (cRIO) via the network stream.  It works very well.  Now, I want to set up a feed back from the target to the host, but I'm stuck on a technicality: is it possible for the reader to automatically extract the network of remote endpoint address in order to implement the return flow?  I looked in the node property expecting to find something like "URL of remote endpoint", but I can't.   As a solution I might always have the host send its address as a message through the first stream as part of initialization, but which seems to be a shame as the target clearly already knows the address of his partner.  Am I missing something obvious here?

  Thank you very much!

  Hello

  Why do you need IP address of the host in the target?

  You need create endpoint writer on the target and create endpoint of reader in the home by giving the IP address of the target. I put what I hear in the images below.

  Point endpoint target writing:

  

  Point endpoint host drive:

  

  Maybe I'm missing something...?

  Thank you

  AREV

  CTO | RAFA solutions

  

• Error-1950678945 (network flow)

  I coded a flow example LAN where a player endpoint waits on the writer and received the error 1950678945.  My firewall is disabled, so this article was not much help.  As I intend to support multiple points across multiple applications on several targers endpoint, I am making the flexible API wrapper.  So, I use the full URL to refer to endpoints.  I discovered that if you are wiring to Terminal "player name" node Create Endpoint of player with a URL, this URL cannot contain the local IP address.

  To avoid the 1950678945, use "localhost":

  

• How to connect two systems using network flow

  Hello

  I am trying to send data to a connected to another system on the same subnet. I do this by using network stream, but the connection is not established, I don't know if there is a configuration that I need to do. Can someone please look at this.

  Thank you

  You get an error?... Are you able to ping between two PCs?

  Have you checked your firewall settings?

  [Edit]: did you give the ip of the target in view vi?

• Flow network 'Alert' 314050

  Attached is a draft play a network "alert" 314050 stream. As this warning stops at my network of communication on the afflicted stream he paralyzed my request. I class this as a nasty bug. I couldn't solve this bug for many days now and therefore turn to the community for help. I hope I'm just something stupid...

  I am using LabVIEW 2014 SP1 in an application that uses 5 network flow between a host PC (Win7) and a cRIO-9082 (Phar Lap). One (or more) streams is to launch a warning function 314050 "reading only flow element" on the reader endpoint. The explanation of this warning is "the engine of network flow does not exist." However, the others communicate very well to the data flow engine actually exists. And, if I read the properties of data flow (in a parallel loop), "Is Connected" is equal to TRUE on all streams (including the stream with the warning).

  The attached draft includes a PC and RT VI. As long as your VI server is active and you have deployed the RT VI is the only thing that you need to enter the IP address that is appropriate for your target RT in the control of the "" target IP address' on the PC of VI. Then run.

  I saw a few runs where the error is not reproduced. Run it for a few seconds several times and you will see the 'attention' appear in one or more of the error of pods on the PC or on the façade of the RT. You will notice also that all communications stops on the afflicted stream (such as checked by the "Total items read / written" for this workflow to saturate at the size of the buffer of '10').

  I have reproduced the bug on a cRIO-9022 VxWorks based as well. I can only reproduce this error when I have 5 + flow (even if I have not exhaustively studied this point). This is the minimum number of streams for my application.

  Another point, there is a unique private network switch (D-link, DG-105) between the PC and the systems of RT.

  Any idea that you can provide would be greatly appreciated.

  AHA, I can found without having to do the 'surgery' in your code (shudder).  I noticed that you start with the remote IP address, then "tell" the remote host IP address, using the two addresses to set up your network stream.

  When I built my 4 stream, I use only the remote IP - address of the host never appears in the code.  In summary, here is how I connect:

  • The RT code begins first (it is set to auto-run when the PXI lights).  Some time ago loop that tries to connect to four components, a reader (Messages of the host) and three writers (Messages to the host, samples to the host and host events) - when all connections are made, the while outputs, which allows the main code to proceed (and use the created network flow now).  An excerpt from the remote initialization routine:

  

  • The screw under 'name of the Stream Reader' and "The writer stream name" basically that the slot name the form "RT/%s/Reader" (or Writer).
  • The time-out on the functions of flow Create Endpoint is 15 seconds.  Because these are all performed in parallel, if the host is not running or do not access within 15 seconds, the loop repeats until the connection is established.
  • The processes on the host computer is almost identical, with several important exceptions.
  • • When there is a player on the remote control, there is a writer on the host (and vice versa).
    • The Sub screws that create the names of streams have an extra entry, INVESTIGATION RT period the name of the writer and the reader.  For example, the names of stream writer creates 'UI/%s/Writer' and ' / / % s/RT/%s/Reader "(where the first string is the IP of RT, the second is the name of the stream).
    • Four streams are created sequentially, not in parallel.
    • The flow of data creation sequence uses the same time of 15 seconds for each stream (but now they are in series).  If the flow fail to connect three times, the process terminates with an error (what causes host 'sound the alarm', otherwise the host now begins with stream set up.)

  

  On the host and remote code, initializing the stream network takes a space of 32 x 32 pixels on block diagrams (the size of the icons boot network Stream.  As you can see here, the VI, themselves, easily fit on a single monitor screen (due, in part, to have the code to create the reader and writer Stream names also encapsulated as face).  In addition to saving valuable screen Real Estate, "shrinking" LabVIEW code by encapsulating functions repetitive in screws makes it easier to create the code, test code and maintain the code.  I recommend you only do this with your code.

  Let me know if simplifying the creation of several data stream using the techniques I suggested here (distance creates endpoints in parallel points, without specify IP host, while the host creates endpoints in the series points, always by specifying the remote IP address) solves your problem 5-Stream.  This works very well for my 4-flow situation, and I don't see why add another stream will necessarily change this behavior.

  Bob Schor

• Reentry network and live stream

  Can you the stream network writer exist within a reentry VI and write strings or arrays to the same endpoint of several threads?

  I have a series of screws that produce data (Flattened to strings) I need to send my host PC via a single network flow.  Fundamentally, the data is simply a channel number, combined with a waveform (of different data types).  These are produced from multiple screws that run asynchronously from the other.

  What I see in front of the reader is a continuous flow of strings, each representing a cluster flattened in the same order they were written.

  Thank you

  XL600

  My main project RT uses 4 flow network - two form a two-way flow of the Message (as in the messages in queue manager), send data sampled (since a single point) to the host and the other sends the data of 'Event', which includes level digital I/O, engine of the Action changes transitions, send and receive Messages on message flow etc.  There is a single event 'Sender', powered by a queue that anyone needing to send an event in landfills - event Streamer is basically the consumer of this producer/consumer model, sending each event to the host, as it is removed from any routine in the generated RT target.  It looks like a lot that you have decided to try it, I can recommend it, because it works well for me.

  Bob Schor

• network data stream

  Good afternoon

  I need to send the data generated in the vi, by network data stream.

  The problem is that I found no example that does something similar, and this is my first time using Activex with Labview. Can someone explain me how to send Activex data via the network stream please and if possible help me find a solution to the attached vi.

  I think I need to convert the data somehow after control of the room before using the writing and reading items, I tried with strings and arrays unsucessfully, I really think I'm missing something.

  Thank you in advance!

  Erika

  Erika,

  What do you think?  You try to play an .avi file, a .mpg or what?  IMAQdx has functions that can play video and output files 'images', and you can deliver these images via TCP/IP on another computer using network flow.  Indeed, there are cameras that capture video and output via TCP/IP - IMAQdx is used to capture the image directly from the camera and can view or save a file from .avi (for example).

  You have the Vision Module installed on your system?  In your Palette of block diagram, it will appear under the Vision and movement and should include IMAQ (or IMAQdx) and utilities of Vision (which contains the Palette under files to make the reads and writes of video files).  See if you can use this to display your video...

  Bob Schor

• RT-target short-term memory when writing to the network stream

  Hey there,

  I have a program that transfers data acquired from the FPGA to the host PC. RT - VI reads data from the FIFO DMA and writes it to a network stream (BlockDiagram.png).

  Now, I am a phenomenon, that the RT-target load his RAM until it is full and accidents.

  I have no idea why this happens, network flow buffer is empty, all the items are read by the host, and there is no table built by indexing or so.

  Someone has an idea, how I can handle this?

  Best regards

  Hey there,

  I had the problem solved,

  the problem was the buffer of the sender endpoint was too big. Unlike this problem: http://digital.ni.com/public.nsf/allkb/784CB8093AE30551862579AB0050C429, wasn't the growth of memory because dynamic memory allocation.

  It is just the normal speed of the cRIO while allocating buffer. The sender buffer affecting many smaller, memory growth stops at a specific level (DSM2.png).

  It is strange, this use of memory that grows slowly, despite the creation of the endpoint with preallouee buffer, so that its use dark quickly when the VI - enforcement stops...

  Best regards...

• Endpoint creare network Stream Reader Launches error-314350 if the target is executable

  I take a Simple Network Streams.lvproj example provided with LabVIEW 2015. It works very well in LabVIEW environment. Then I create an EXE file using simple flow network - Target.vi of this project and that you try to run the target as the EXE and the host like VI (Simple flow network - Host.vi).

  Step Creare network endpoint Player streams of Simple flow network - Host.vi (runs in the LabVIEW development environment) lance error:

  Error 314350 has occurred to create network Stream Reader Endpoint in Host.vi

  Possible reasons:

  LabVIEW: Another application is already streaming of data to an endpoint in the specified context.
  If you specified a frame name in the name of the reader or writer terminal endpoint, you must specify a name of context not used.
  If you have not specified a context name, you must specify a name unused context by entering the name of the reader or writer terminal endpoint URL.

  I have reastarted LabVIEW and all computer, so there is not another application that could flow. However, the error does not disappear. What could be the reason?

  Thank you

  When you stream from an application, you will need to provide a 'way' in the URL.

  To make your (OK, NIs) examples work in this "context":

  In the Target.vi - to precede the names of endpoint with '//localhost:sns '.

  In the Host.vi - change the IP address control entry target to "localhost:sns".

  Check out the latest entry in this reference:

  Specification of network flow point endpoint URL

  To learn more about network streams:

  Communication without loss with flow network: components, Architecture, and performance

  Note that these examples are only starting points. More code is needed to formulate a robust demand.

  Steve

• How to give endpoint network Stream as input/output for a Sub VI

  I have a program to write data to a stream and to read using the host. In the reader program, I have a Subvi, which I need to pass endpoint network Stream. I'm unable to do so.

  https://decibel.ni.com/content/docs/DOC-15920, in the program in the link, he said he a VI that reads an element in the stream. If you see the screenshot, it connected endpoint network Stream for a subVi.I am unable to do so. A can you please tell me how to do it.

  Thank you

  You will need to place a data network flow control in your Subvi. You then connect the control on the part of the connector.

  You can place a control of flow network as follows:
  In primary VI you take the wire of network flow and right click. Select create - control. Use strg + x for the main control of the VI to the Subvi from the port.

  Then follow the instructions here http://digital.ni.com/public.nsf/allkb/1FA00093A04BFCF5862570920049E482 to connect the control to the connector pane.

  There may be an easier way to do it, but it works very well.

  I hope this helps!

• ESX, number of network cards, NETIOC or traditional approach

  Hi all

  I have a question of design on the network of an ESX environment configuration.

  In short, we must decide how many cards per server, we need.

  It's an ESX cluster for a Cloud Computing environment (hosting).

  I told my boss about 8 cards per server would be appropriate (4-port ethernet cards).

  He said, however, that I am crazy in the coconut with so many NICs per host,

  because of the complex network management / wiring.

  and said that the 2 network cards should be sufficient, or maximum 4.

  We don't know yet if we'll use NETIOC or the traditional approach

  with multiple VSWITCHEs to separate the network flow.

  That's what I had in mind when using no NETIOC:

  THE VM NETWORK:

  VSWITCH1 - ETH0 (active) = physical NIC 0_port0

  Eth1 (at rest) = physical NIC 1_port0

  VMOTION NETWORK:

  VSWITCH2 - ETH2 (active) = physical NIC 0_port1

  Eth3 (at rest) = physical NIC 1_port1

  IP STORAGE NETWORK:

  VSWITCH3 - ETH4 (active) = physical NIC 2_port0

  (Passive) ETH5 = physical NIC 3_port0

  NETWORK FAULT TOLERANCE:

  VSWITCH4 - ETH6 (active) = physical NIC 2_port1

  (Passive) ETH7 = physical NIC 3_port1

  Is it really that crazy to have 8 adapters per ESX host?

  If so, the 6 is acceptable?

  I think 6 would work if we combine vmotion and storage over IP on the same VSWITCH,

  or tolerance vmotion and the fault on the same VSWITCH.

  He thinks that 4 is an absolute minimum.

  Somehow, I don't think it's a good idea to combine the vmotion/ipstorage/and fault tolerance

  on the same network adapter. I think that if we get only 4 adapters for each host.

  We forget storage over IP and keep all related storage

  connected with Fibre Channel.

  But maybe I am too greedy-NIC here?

  Currently, we do not fault tolerance

  but I think that there is a demand for it in the future.

  It is, therefore, may be an exaggeration to allocate separate physical maps to do this.

  It might be better to combine it with the flow VMOTION?

  That's what I had in mind when using NETIOC:

  1 virtual switch, whose actions for the load balancing,

  and with the load database grouping enabled.

  SHARING OF NETWORK FLOWS:

  VMOTION 20 |  VSWITCH1 | eth0_ACTIVE

  MGMT 10 |                         | eth1_ACTIVE

  NFS 20 |                         | eth2_ACTIVE

  FT                  10  |                         | eth3_ACTIVE

  VM                 40  |                         | eth4_ACTIVE

  |                         | eth5_ACTIVE

  |                         | eth6_STANDBY

  |                         | eth7_STANDBY

  It may take a higher share for NFS valuie.

  We don't know yet what kind of goal, NFS data warehouses will be used.

  There will also be Fibre Channel connected to data warehouses.

  In the NETIOC scenario, if 8 physical NIC are really too much, I guess we could

  do with 6

  But 6 also seems to be a minimum in this situation for me,

  or can come out us with 4?

  Also, about NETIOC, given that this kind of thing is still pretty new (since 4.1),

  anyone here have experience with the new NETIOC feature on

  a distributed switch?

  I would get at least 6 cards per server,

  better one or two network cards too much that you do not use at the beginning.

  but have the option to use, at least be blocked eventually.

  not being able to implement a feature (for example. Fault tolerance)

  because you have no free NIC more.

  Or otherwise, they should just go with 2x10GB NIC,.

  and distribute the stream with NETIOC.

  It would greatly simplify cabling and management.,.

  and give more bandwidth

  Well...

  Any input would be greatly appreciated.

  Concerning best practices, you will need 8-

  vMotion and your management network (you had left it) can share a pare - woth the pair configured active / standby management and standby/active for vMotion - FT, VM Network and Sotrage IP network should all be insulated and redundnat - depending on your load I/O that you can condense up to four network adapters with FT/VMs and storage over IP sharing the same NIC but on different VLAN -

• How to make the autonomous system?

  Hello, I want to make my autonomous system (means do not need a pc to run) using myrio 1900 board.so is necessary to use FPGA of myrio or it can work with programming level RT?

  Use of the FPGA depends only on your application.

  If your application requires no development of FPGA, you can have only one part RT and create an autonomous system. To create a stand-alone application, you create application RT for your share RT of the software, to run as a startup and deploy on your hardware.

  Of course your RT code should not have dependencies on the host, that is, network flow, variable network shared, party etc. Or at least, you must handle errors, related to lost communication.

  Thank you

  AREV

  CTO | RAFA solutions