Can anyone help me to reduce the subVi execute time

[united kingdom]

Hi, all

I have attached a  VI and its profile data excel file. 

The code for this VI is very simple, the experiment data length is 1,000,000, and the reference signal data length is 200, but it cost a lot time to execute, can anyone give me any advice how to reduce its execution?

 I understand in some ways, the execution time relate to how good my PC is, I am trying to figure out what kind of PC can collect 1,000,000/s first through a PCI-6251, and then save useful information after signal processing. So I want my code is very efficient.

thanks

Lyn

[GregFreeman]

You are looping through your for loop 999,800 times...that will take a while.

Message Edited by for(imstuck) on 04-07-2010 04:48 PM

[united kingdom]

Yes, I know, my question is ---- anyone has better way to do it?

[PhillipBrooks]

If you're using LabVIEW 2009, you might gain some performance by setting your loop to a parallel loop.

See this youtube demo: http://www.youtube.com/watch?v=pSHJRotX7mY&feature=related

[smercurio_fc]

Philip's suggestion is a great suggestion. I tested your code with random data, and on my i7-860 it took around 860 msec. When I enable parallel execution it took around 200 msec.

[united kingdom]

Thanks, everyone. Unfortunately, I don't have Labview 2009.

Checked website, it cost a lot money to purchase it.

Lyn

[PhillipBrooks]

Message Edited by Phillip Brooks on 04-08-2010 09:15 AM

[johnsold]

Lyn,

What you are doing looks a lot like convolution.  Can you get the results you need by using any of the various Convolution VIs?

Lynn 

[PeterCho]

HI,

Converting to subroutine where possible was best for improve performance.

Cheers, Peter.

[united kingdom]

Thanks, Lynn

it is sort of convolution, I have tried using convolution VI, it looks like works with a little extra code, but performance is much better.

Lyn