Labview doesnt seem to be re-using memory

I have a high speed hardware timed DAQ program (Labview 6.02) that gathers syncronous counter/timer information for a short period of time. Due to the shear volume of data and the speed at which it is gathered It is buffered and then saved to disk. Upon completion of the acqiusition the data is pulled from the disk and processed (x-Y graphs, FFT etc). If I try and do another acquisition the program doesnt seem to re-use the memory utilised for data and for displaying it in graphs etc. So after a few acquisitions the whole thing can grind to a halt. I have to close the application and Labview and restart it so that the acquisition will run properly and then the things starts all over again. How can I get labview to sort of dump
the data or clear its memory once I have processed the graphs etc. After all the raw data is saved on disk anyway.

> Does anyone know exactly what the "Deallocate memory as soon as
> possible" option does? We are also trying this as a last resort, but
> we have no clue what it is actually doing. For example, will it dump
> data in uninitialized shift registers? Does it unload VIs from memory
> (when you would normally expect them to remain in memory)? Or is it
> just "tidying things up" more quickly than it normally does?
>
This option means that after each subVI call, even those inside of
loops, LV will deallocate all temporary memory buffers. It has no
effect on unwired shift registers, controls and indicators or on the
results of the subVI. Without this option turned on, LV will leave the
buffers allocated waiting for the subVI to be called
again. So, this is
the typical space versus time tradeoff. This has no effect on which VIs
are loaded or unloaded.
Now that you know what it does, this feature can lead to fragmentation
of the memory manager since it so frequently allocates and deallocates
the blocks of memory. There is nothing wrong with the feature, but most
memory managers can't deal with this and with certain VIs, it can result
in more memory being used than when it is turned off.
Often the "memory problem" is better solved by getting rid of global
variables and local variables and making more subVIs. It is hard to get
more specific, but the user manual used to have a chapter on performance
that explained some of it.
Greg McKaskle

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Labview doesnt seem to be re-using memory

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