Labview memory expansion

Hi all

I have a little problem with the analysis of extreme data file (.txt) 756 MB of wholesale; ~65.000.000 datapoints

I have already divided the different sections of the screw program separated to limit virtual memory needed on my computer (Samsung Q70, Vista 32-bit, Core (TM) 2 Duo CPU T7300 @ 2.00gHz 2.00 GHz; 2.00 GB of RAM)

It's just a single test that I intend to do to determine (using the method variable Allan) different sources of noise.

Only problem, is that LabVIEW (8.5) and Vista continue to send the error there is not enough memory to complete the operation.

Now I'm wondering if there is a little trick to temporarily increase the virtual memory for this analysis once... I don't have access to a University server that I am allowed to use for that special occasion, but I wonder if it's necessary. VI is attached its form of moose, included a screenshot of the error in an empty VI just to see if the loading of the file and the path it in a graph are possible...

Thank you

Ravens fan wrote:

Your code is hard to follow.  There was so much the Subvi and none of them are executable on my system.  Here are some tips of LabVIEW.

1. do not use stacked sequence structures.  The wiring to make it go in the wrong direction and hide the code.

2. with the help of the function sign Abort VI stop is a bad idea.  It's the same as using the button abandon on the toolbar.  It blocks the dead code.

3. There is no reason to read a control and then immediately write to a local control variable.

Because I could not follow your code, I can't tell you exactly where your problem is.  You can read the data file all at once in a single large?  If so any time this table is copied into memory, you will use another (8 x 65 million) bytes of memory.  Do that only 2 or 3 times and you will run out of memory.

You will need to read and manipulate the data into smaller segments.  Read this article to manage large in LabVIEW data sets

Ravens fan,

You did say "exactly where your problem."

M. de Hond,

You can see the problem actually two things.

(1) right-click on your structures of stacked sequence and choose replace > replace with flat sequence.

(2) select Tools > profile > benefits to see the buffer. In the floating window choose"dies"and "Clusters", then click "Refresh". Points flashing everywhere, a new buffer is allocated.

You should do this for your file writing void VI as well. You will see a lot of buffers are created. LV must operate within the limitiaions of the OS and that boils down to a footprint less than 2 G memory theory, practice of 1.2 G. An additional limitiaon is that any allocation of the buffer must be adjacent to memory fragmentation might asert an additional limitaion.

How can you fix your code?

The game is called ""Chase points "." The structure of your code must be changed to create buffers less. A search on "on-site" for tons of discusions on this aspect of LV beyond the Ravens fan provided link. If I did myself *, I would have set up a custom Action engine who made all the data tasks through an appropriate set of actions. The engine of the Action would shift to save your data and sound analysis and I would do my damnedest possible to ensure that the SRs are only buffers used in the entire application.

Have fun!

Ben

* I faced this challenge me and a driving force has been the solution.

Tags: NI Software

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