How to increase the speed of producer-consumer architecture
Hey everyone -
This is a follow-up to a previous thread that I had posted (
http://forums.ni.com/t5/LabVIEW/How-to-use-a-dynamic-true-false-signal-with-a-case-structure/m-p/114...
), but my next question has taken a bit of a different direction so I have made a new thread.
Following tbob's suggestion, I am trying to use a producer-consumer architecture to start and stop data acquisition from a simulated NI 9237 device. I have attached the current version of our code to this post (Producer_Consumer_architecture.vi). Our main problem is that there is a significant lag between when elements get added to the queue using the Enqueue function, and when they are removed from the queue using the Dequeue function. As a result, the signals from our simulated DAQ channels run for much longer than they are supposed to, and the start-and-stop of data acquisition is not keeping in time with the simulated square wave signal (we would like our NI 9237 device to acquire data when the square wave has an amplitude over 3, and stop acquiring when the amplitude is under 3). If you allow the program to run for about 30 seconds, you will see what I mean (press the stop button twice to quit the program).
If anybody has any suggestions as to how we can increase the speed of the program, they would be very much appreciated!
Thanks in advance!
Attachments:
Producer_Consumer_architecture.vi 122 KB
Save_data.vi 14 KB
hello,
i don't have tools needed but , i see one thing is that you enqueue
every time you are greater 3 that means about every 2-3 ms so consumer is really sought
is it really what you want ?
may be you want to start on a treshold so you can use a treshold fonction
if i don't make mistake your square is 10 hz and the daq is configured 25000 sample 25000 hz
so you aquire 1s of signal every 100ms , there is something to correct
make tests and tell us
Regards
Tinnitus
CLAD / Labview 2011, Win Xp
Mission d'une semaine- à plusieurs mois laissez moi un MP...
RP et Midi-pyrénées .Km+++ si possibilité de télétravail
Kudos always accepted / Les petits clicks jaunes sont toujours appréciés
Don't forget to valid a good answer / pensez à valider une réponse correcte
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Look at your system tools and see what is happening:
--are you leeking memory?
--are you having too many connection?
--are your thread not being disposed of properly?
You'll have to do some snooping locally to figure out more of what is happing before anyone else doesn't needs a crystalball to answer your questions. -
How to increase execution speed ??
Hi,
i want to know (if it is possible...) how to increase the speed execution of an application ??
Thanks in advance
SteveDepends on what kind of application it is, where you want the speed increase, and whether you can pay for it with additional memory usage.
On general optimisations, there are two schools of thought.
The academic side says, write your application without doing any optimisations, and then optimise the bits that ou can show to be bottle necks. While this produces elegant code, the result can be very hard to optimise when you need to.
So I say; design with optimisation in the back of your mind. For example, if you need to access objects with great speed, then avoid interfaces if you can, because they will slow your code considerably, even if they do make it reuseable. Avoid massive creation of objects - for example string concatenation using + is very slow - use a stringbuffer instead if you have many to do.
For smaller increases in speed in algorithms and such, consider creating a local reference in a method to a class object, and using short in place of int in loops. Unroll as many loops as you can. Avoid making repeated reads to the same value in an array - hold it in a temporary variable instead.
For every optimisation you make, your program will get increasingly hard to read and maintain.
Do you have some more detail on what it is you want to speed up?
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