When does the tick count start
I see that the tick counter rolls over at 2^32 ms, that's 49 days. So if the counter started when Labview or the VI starts, I would never care about the rollover.
So when does it start? Can I control when it starts? I need a resolution less than 1 sec, so the second timers don't help me.
Also do other funtions or VIs continue to operate when a Wait (ms) function is running?
The tick count does not begin when you open LabVIEW or the VI. The on-line help says that the base time is undefined. There is however, no problem with you taking the tick count when you first start the VI and using that later in the VI. It's also untrue that the other time functions in LabVIEW only have 1 second resolution. They have the same millisecond resolution as tick count. If you have code in parallel with the Wait (ms) function, they will exeucte in parallel.
Also, in the future, post questions of this nature to the LabVIEW board. This board is for the NI counter/timer boards.
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When does the Runtime Service start up and down
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Why is the Tick Count function slow when used with a .dll but fine with normal lab view code?
when using the Tick Count millisecond timer with a .dll I've written in C, I'm getting some odd timing issues.
When I code the function I want (I'll explain it below in case it helps) in LV and run it as a subVI, feeding it the Tick count as an argument, the function runs quickly, but not quite as quickly as I would like. When I feed this same subVI just an integer constant rather than the Tick Count, it takes about the same amount of time, maybe a tiny bit more on average.
When I bring in my function from a .dll, however, I start to run into problems. When I feed my function an integer constant, it is much faster than my subVI written in LV. When I feel my .dll the Tick Count, however, it slows down tremendously. I'm including a table with the times below:
| Clock | Constant |
SubVi: | 450ms | 465ms |
.dll | 4900ms| 75ms |
This is running the function 100,000 times. The function basically shifts the contents of a 2-dimensional array one place. For this function, it probably won't be a huge deal for me, but I plan on moving some of my other code out of LV and into C to speed it up, so I'd really like to figure this out.
Thanks,
AaronHi Aaron,
Thanks for posting the code -- that made things a lot clearer for me. I believe I know what's going on here, and the good news is that it's easy to correct! (You shouldn't apologize for this though, as even an experienced LabVIEW programmer could run into a similar situation.) Let me explain...
When you set your Call Library Function Node to run in the UI Thread you're telling LabVIEW that your DLL is not Thread-safe -- this means that under no circumstances should the DLL be called from more than one place at a time. Since LabVIEW itself is inherently multithreaded the way to work with a "thread-unsafe" DLL is to run it in a dedicated thread -- in this case, the UI thread. This safety comes at a price, however, as your program will have to constantly thread-swap to call the DLL and then execute block diagram code. This thread-swapping can come with a performance hit, which is what you're seeing in your application.
The reason your "MSTick fine behavior.vi" works is that it isn't swapping threads with each iteration of the for loop -- same with the "MSTick bad behavior.vi" without the Tick Count function. When you introduce the Tick Count Function in the for loop, LabVIEW now has to swap threads every single iteration -- this is where your performance issues originate. In fact, you could reproduce the same behavior with any function (not just TIck Count) or any DLL. You could even make your "MSTick fine behavior.vi" misbehave by placing a control property node in the for loop. (Property nodes are also executed in the UI thread).
So what's the solution? If your DLL is thread-safe, configure the call library function node to be "reentrant." You should see a pretty drastic reduction in the amount of time it takes your code to execute. In general, you can tell if your DLL is thread-safe when:
The code is thread safe when it does not store any global data, such as global variables, files on disk, and so on.
The code is thread safe when it does not access any hardware. In other words, the code does not contain register-level programming.
The code is thread safe when it does not make any calls to any functions, shared libraries, or drivers that are not thread safe.
The code is thread safe when it uses semaphores or mutexes to protect access to global resources.
The code is thread safe when it is called by only one non-reentrant VI.
There are also a few documents on the website that you may want to take a look at, if you want some more details on this:
Configuring the Call Library Function Node
An Overview of Accessing DLLs or Shared Libraries from LabVIEW
VI Execution Speed
I hope this helps clear-up some confusion -- best of luck with your application!
Charlie S.
Visit ni.com/gettingstarted for step-by-step help in setting up your system -
How long does a tick last for the Tick Count (ms) VI in LabVIEW?
I'm trying to compare the timing performance between a VI implemented in LabVIEW and another VI implemented in LabVIEW FPGA module. If I use the Tick Count in both VIs (every one in their own module), I want to know how long does a tick last in LabVIEW standard (in the computer)?
Thanksvitrion wrote:
I have this doubt because I read that a tick lasts 55ms in the following source:
http://books.google.com.mx/books?id=en1GKs2huTcC&pg=PA33&dq=tick+count+(ms)+labview+55+milliseconds&...
My tick count provides me better results than the hardware results, which is impossible because this is the same algorithm. If I consider the 55ms time, then the FPGA is really faster.
Hardware Software with Software with
(ms) 1 ms Tick Count (ms) 55ms Tick Count (ms)
Algorithm 1 49.48 1.5552 84.535
Algorithm 2 0.8875 0.032 1.87
Algorithm 3 0.1756 0.0241 1.43
Algorithm 4 0.27 0.27 1.32
What's your opinion?
Thanks again
I think you are misunderstanding what the value of a "tick" is. From what I gathered from reading your link (which I couldn't get to from your post, but accidentally ran into on a search) a tick of the OS clock." Curiously, though - why 55ms? That was mentioned as the tick of a Win95/98 OS!
I guess you can say that the it returns the value of the next "tick" of the OS clock and returns that value in ms. So, the value of a tick varies from OS to OS. In Windows 95/98, for example, you can only look at the OS clock every 55ms or so, but it still returns a value that represents ms.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
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When does my AppleCare agreement start?
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ABAP Dump is encountered when doing the negative subsequent adjustment
Hi Experts !!!
An ABAP Dump is encountered when doing the negative subsequent adjustment (posting a 102 movt type) on a Purchase Order via the Z function module. The dump only happens if the scenario satisfies the following conditions:
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Initial Analysis:
An exception/error occurs when calling function u201CMB_CREATE_MATERIAL_DOCUMENT_UTu201D .
Please see below error anlysis report from after executin Zfunction module code.
Error analysis
Short text of error message:
Material 3000000234 / US01 Column 0001: MSEG-BPMNG not in quantity table
/not consistent
Long text of error message:
Diagnosis
Before the system posts a material document for an HPM/TDP material
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o For each unit of measure in the Unit of Measure Group
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System Response
The system stops processing.
Procedure
If the error is reproducible, contact your system administrator.
Procedure for System Administration
The inconsitency can have several reasons, for example:
o Incorrect postings from external systems using function module
MB_CREATE_GOODS_MOVEMENT
o Handling errors
o Application programming errors
Technical information about the message:
Message class....... "O3"
Number.............. 359
Variable 1.......... 3000000234
Variable 2.......... "US01"
Variable 3.......... 0001
Variable 4.......... "BPMNG"
Please let me know,if you want some other details.Problem Issolved
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David R
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