Execution time optimizing labview code

Hi,
I would like to optimize my labview program. Is there a way I can plot
the execution time of my program as a function of some parameter I am
changing in my program. I was thinking of placing the entire program in
a while loop and then changing the parameter during each loop iteration
and then outputting the time that the program takes to execute as a
function of the parameter. The problem is how would I obtain the
execution time.
Thank you,
-Tim

Here a re a few more tips:
Running on a typical multipurpose OS will will make things a bit unpredictable because you never know what else is running so you should always repeat each run many times (then take the fastest, not the average, of all corresponding times).
Make sure that each run takes a few hundred milliseconds to get accurate values.
For timing purposes, it might be worth to temporarily raise the execution priority. The results will be much more reproducible (at the expense of useablility).
LabVIEW Champion . Do more with less code and in less time .

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Execution Time for T.Code

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From SAP
For old verions
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click on "Performance Database" tab
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How to find the Execution Time for Java Code?

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This run took 0 Hours ;1.31 Minutes ;78.36 Seconds
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Timing the Execution of Labview code

Hey Guys,
I am looking for suggestions to limit the execution time for my code, or even to time it, Idont want it to exceed say 30 seconds as the next device is carried in to be tested. I am initialising the code,aquiring parameters from a database , running through the test sequence and writing the results back to a database. Thanks guys.
Damien

Damien,
You might get more replies by posting on the LabVIEW Board. It gets much more traffic than this one, which is primarily for issues related to hardware counter/timer cards.
Several methods are in common use for timing code. One is to use the Tools >> Profile >> Performance and Memory menu item. This opens a window which allows you to get information about the time each VI and subVI takes to execute along with quite a bit of other useful information. It is quite helpful for idenitfying those portions of the code which are taking the largest amount of time. Then you can focus your efforts to improve the code where they will do the most good. If your code does not use subVIs, (well, it should), then this will not help much.
A way to test the time of small segments of code, subVIs or not, is to include the code in a 3-frame sequence structure. The first and last frames have Tick Count functions. In the middle frame is the code under test, often inside a For loop so that it can be repeated many times to capture the time of code which may execute in nanoseconds or microseconds. After the sequence structure completes the two tick counts are subtracted to get the elapsed time for the code in the middle. There are many posts in the LV Board about pitfalls and how to optimize this technique.
As for limiting the time, this can be more problematic. Assuming that you are not running on a Real Time operating system, it is hard to guarantee a maximum time. I think timed loops will report that they finished late. The key is to break up the code so that no section takes very long. Then a supervisory module can stop a process after any section if the total time approaches or exceeds your limit. For example if your database is offline, you need to make sure that the code which acquires the parameters has a timeout mechanism so the program does not wait forever for data it may never get.
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Slow Execution Time of Exponential Function

Hi,
I am developing a program with large dataset (arrays size of around 1000*1000 elements).
I realised that my program ran quite slow when calculating exponential for each array elements.
So, I built a simple porgram to test the execution time for exponential vs multiplication on 1000*1000 array elements and found
out that the period is ~25 times longer. Attached is the program (Labview 2011).
The specs of my system are:
1) Windows 7
2) Intel i5 3Ghz with 4gb ram
3) Labview 2011
The actual program I built has a version in Matlab and uses exponential function as well. However, the execution time in Labview is around 10 times longer than the Matlab. I believe that the exponential function is the cause of this after making some analysis using built-in "Performance and Memory" tool and modification to the program.
Is there any way I could make the exponential function runs faster? Or any better way to handle large array operation? (I have tested array operations with nested FOR loops and paralel execution but the results is not that great.
Hope anyone can help. Thanks for any input.
Attachments:
Execution Time-Exponential Function.vi ‏11 KB

Thank you for your answer.
I am sorry, I could not upload the real code since it is large and has lots of dependency. But, I wrote simple program both in Labview and Matlab as attached.
I tried to make both program doing the same thing and put each element as random number between 0-1 to avoid any folding/optimization process.
The Labview took around 974ms to complete the task while the matlab 177ms. If the the way I implemented them are correct, the Matlab is around 5 to 6 times faster than Labview to execute Exponential function.
Attachments:
Matlab Exponential Test.PNG ‏19 KB
Labview Exponential Test.PNG ‏24 KB
Exponential Test.vi ‏10 KB

Reduce execution time

How to reduce the execution time of this code?
Loop at porder1.
SELECT aufnr bstmg hsdat sgtxt bwart charg FROM mseg INTO
(porder-aufnr,porder-bstmg,porder-hsdat,porder-sgtxt,porder-bwart,
porder-charg)
                                         WHERE matnr = porder1-matnr AND
                                               aufnr = porder1-aufnr AND
                                               werks = porder1-pwerk AND
                                               ( bwart = '101' OR
                                                 bwart = '102' ).
Endselect.
Endloop.
Regards
Praju .

Hi prajwal.
I would like to suggest,
It is possible to reduce the time of execution by Increasing the number of fields in the WHERE clause as only those specific number of records are fetched which results in comparatively less execution time.
Also, SAP has designed such powerfull tools like Transactions - ST05, ST07, ST30, and many more
I would like to suggest you a couple of references relating to your case,
[SDN - Reference for Long execution time during processing of a select query|/thread/477540 [original link is broken];
[SDN - Reference for Reducing the Execution time of the program - Tools|How can i reduce time of execution;
[SDN - Reference for solutions to reduce the execution time of a program|How to reduce my query execution time?;
Hope that's usefull.
Good Luck & Regards.
Harsh Dave

How to measure fpga execution time

Howdy--
I'm hacking through my first FPGA project without yet having the hardware on hand, and I find I could answer a lot of my own questions if I could predict what the execution time (ticks, mSec, whatever) of bits of my code will be. Running FPGA VIs on the Dev Computer with built in tick counters does not seem to be the proper way to go. Is it possible to know the execution time of FPGA code before compiling and running it on the target?
If it matters to anyone, my context for the question is a situation where a 10 uSec loop is imposed by the sample time of my hardware (cRIO 9076, with a couple of 100 ks/S I/O cards), and I'm trying to figure out how much signal processing I can afford between samples.
Thanks everyone, and have a great day.
Solved!
Go to Solution.

bcro,
You can look into cycle accurate simulation, which would give you a better understanding of how your code will work. More information can be found here: http://zone.ni.com/devzone/cda/tut/p/id/12917
As a rough measure, you can estimate that simple functions will take one tick to execute. However, there is not list of what is and is not a simple function.
You could also try placing code inside a single cycle timed loop (SCTL), which would then guarantee that all of the code in the loop will execute in 1 tick. However, if you are doing a lot of operations or trying to acquire an analog input, this will fail compilation.
Drew T.
NIC AE Specialist

For loop 1 iteration execution time

Hi,
what is the time taken of for loop 1 iteration without code inside.How to calculate this Execution time.

Ravindranath.K wrote:
Hi,
what is the time taken of for loop 1 iteration without code inside.How to calculate this Execution time.
No code in the FOR loop? It will not use any time because the compiler will optimize it out.
Why do you even need to know?
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

How to send data to labview code at run time while using with (or executing the sequence)the teststand

Hello
I am new to the Teststand.
I am using labview8.0 with teststand 3.1
I have developed some labview codemodules as vi's without using the teststand utility library pallete
Now i have to run them in teststand.
While executing them(as a sequence) in teststand,i need to enter the data to the labview code at run time.For this labview front panel should appear as GUI or popup (while executing).Is it possible to do this without using teststand pallete.
or i need to change the code with teststand pallete(i think it is difficult now to change the code)
Plz provide a solution to this problem
Also one more,how and where to use the 'pass by reference' option
Thanks and Regards
Mudigondla

Hi,
see your other post http://forums.ni.com/ni/board/message?board.id=330&message.id=13914
Also, you can, specify to display the front panel of your VI when you specify your VI in your sequence file.
There are examples, for dialog panel using LabVIEW, in the examples folder of TestStand and on the NI Web Site.
Regards
Ray Farmer
Regards
Ray Farmer

Performance and code execution time

I've just successfully compiled TidyHTML into SWC library and after running a few test I am a bit disappointed - execution time of flashcc-generated code on my PC is near 500 ms(and approximitly 3000 ms on Nexus 7), when C++ console application executes the same code in 36 ms. So C++ application is almost at 14 times faster - is this normal for Crossbridge? TidyHTML was compiled into static library using gcc with -O4 flag, and SWC was compiled with g++ using the same optimization level.

Thank you for answer, I'll check it out with Scout. I understand how it works so I do not counting on a same performance as native code may show. But a 14x difference in performance seems suspicious. I've noticed that on first run of function from SWC on Android tablet it takes 3 seconds, but during next calls - approximitly 1 second, that looks more close to expected result. On PC code executes among 750-800 ms on first run and 410 ms after that.

How to optimize execution time for code

Please suggest the way as i m new to performance tuning for reducing the execution time of code . Related document to performance tuning is appreciable .also tell how to work with Tcode ST05 .
Thanks in advance

Please Read before Posting in the Performance and Tuning Forum
Thread locked.
Thomas

What is the difference in execution time between a program written in C language and the same program made with LabView?

what is the difference in execution time between a program written in C language and the same program made with LabView?

Hi Pepe
You cannot say which is faster, the LV or the C programm. The only way to be sure is to program in both environments and to check than. Check this for some benchmark examples:
http://zone.ni.com/devzone/conceptd.nsf/webmain/DC9B6DD177D91D6286256C9400733D7F?OpenDocument&node=200059
Luca
Regards,
Luca

How to improve the execution time of my VI?

My vi does data processing for hundreds of files and takes more than 20 minutes to commplete. The setup is firstly i use the directory LIST function to list all the files in a dir. to a string array. Then I index this string array into a for loop, in which each file is opened one at a time inside the loop, and some other sub VIs are called to do data analysis. Is there a way to improve my execution time? Maybe loading all files into memory at once? It will be nice to be able to know which section of my vi takes the longest time too. Thanks for any help.

Bryan,
If "read from spreadsheet file" is the main time hog, consider dropping it! It is a high-level, very multipurpose VI and thus carries a lot of baggage around with it. (you can double-click it and look at the "guts" )
If the files come from a just executed "list files", you can assume the files all exist and you want to read them in one single swoop. All that extra detailed error checking for valid filenames is not needed and you never e.g. want it to popup a file dialog if a file goes missing, but simply skip it silently. If open generates an error, just skip to the next in line. Case closed.
I would do a streamlined low level "open->read->close" for each and do the "spreadsheet string to array" in your own code, optimized to the exact format of your files. For example, notice that "read from spreadheet file" converts everything to SGL, a waste of CPU if you later need to convert it to DBL for some signal processing anyway.
Anything involving formatted text is not very efficient. Consider a direct binary file format for your data files, it will read MUCH faster and take up less disk space.
LabVIEW Champion . Do more with less code and in less time .

Execution time of a flat-sequence

Hello there -
Is there any way to get a measurement of how long each part of
the flat sequence takes to execute? Anything like matlab's "tic" and "toc"
commands in labview? I have been playing with it for a while now and
have yet to discover if Labview has this functionality. Anyone know of
anything like this?
I currently have a VI that controls the realtime acquisition of a CCD camera via Firewire and a USB spectrometer. The VI collects data from each of these devices (triggered by an external source at 10Hz), and dumps them into a Matlab script which does analysis on the CCD image and spectrum. The bulk of the VI sits inside a while loop, which continues to run until the user presses the stop button. Inside this main loop is a flat-sequence. The sequence goes: ACQUIRE DATA ---> PROCESSING DATA ----> MATLAB SCRIPT ----> PLOTTING GRAPHS -----> OUTPUT DATA TO FILE.
The problem here is that the VI runs at 5Hz, while we are triggering it at 10Hz. Originally, it was my thought thought that the matlab algorithm was to blame, but I used the matlab commands "tic" and "toc" to determine that the matlab algorithm runs in 15-20ms. I did this by putting a "tic" command at the top of the matlab algorithm and a "toc" command at the bottom. The problem, as I have now discovered is that the rest of the labview code takes ~180ms to execute. (This was discovered by putting the "tic" at the bottom of the program, and the "toc" at the top of the program, thereby measuring the execution time of everything except the matlab algorithm). Each time a trigger signal from the external source comes in, it starts the flat-sequence structure (which takes ~190ms), and then waits for another trigger signal, always missing every second signal. My eventual goal is to reduce the bloat, and get the algorithm down to less than 100ms, so that I can run the VI and acquire data at 10Hz rather than 5Hz. If anyone can offer some help with this, it would be much appreciated!
Eric
P.S. - I have attached a copy of the VI that I am working on, but unfortunately, it most likely will not run on your computer....the VI will not run unless it is connected to a triggered spectrometer and CCD camera....but I have attached it anyways incase anyone who can help might want to take a look.
Attachments:
RTSpider.vi ‏376 KB

can we divide the program into 2 parts and use background process for acquisition and front end process for analysis?
I mean, create 2 VIs from the present VI and then launch the acquisition program dynamically as a background process and fire events in Main VI from acquisition VI and process it. not sure how much it is going to reduce. lets give a try....
Anil Punnam
CLD
LV 2012, TestStand 4.2..........

To reduce execution time of a Business Objects Dataservices job.

The issue that we are facing-
Our goal- To compare a record from a file with 422928 records from another table on basis of name & country, if a match is found then you take some specific columns of that matched record (from the table ) as our ouput.
What we are doing- We are at 1st removing duplicates by doing matching on the address components (i.e.- addr_line1, city, state, postal code & country), here                    the break key for match transform is country & postal_code, its taking 1823.98 secs. Now the record count is 193317
                  Then we are merging the file record along with the 193317 records to put them in the same path and send them for matching.
                  The match criteria is the firm name & iso_country_cd,
                   the break key for match transform is the iso_country_cd & the 1st letter of the name.
                   It took 1155.156 secs.
We have used the "Run match as seperate process' option for the match to reduce the time.
The whole job took 3038.805 secs.
Please suggest how to reduce the execution time.
Edited by: Susmit Das on Mar 29, 2010 7:41 AM

This really is impossible to help with without seeing your code.
Replacing while loops with Timed Loops will not help. Timed Loops are used for slowing while loops down in a controlled manner. You would use them to synchronise with a clock rate, and can set other parameters for priority and CPU allocation etc. These will not likely help to reduce your execution time.
If you are seeing code execution of 1 second then you will need to optimise your code to reduce the execution time. There are LabVIEW guides on how to improve your code execution time, just search around for them.
Also try using the Profiling tools to learn which VIs (I presume your code is componentised and each while loop contains subVIs?) are hogging the most CPU time.
If you cannot share your VI then there it is very hard to know where your code execution bottlenecks are.
Thoric (CLA, CLED, CTD and LabVIEW Champion)

Execution time optimizing labview code

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