Does NiVisa fix the Ethernet read buffer allocation bug?
NiVisa 3.01 does not properly allocate memory for the read buffer and gives resource allocation error messages.
Thanks you Scott for answering me.
The problem showed up when trying to read back the instrument state of a Tektronixs TDS3014 oscilloscope.
Shown below is the most significant code:
status = viOpen(viDefaultSession, TCPIP::12::INSTR, VI_NULL, VI_NULL, &viESA);
strTemp = "*LRN?";
status = viWrite (viESA, (ViBuf)strTemp.GetBuffer(strTemp.GetLength()), strTemp.GetLength(), &nRetCount);
// Then to retrieve the data:
status = viRead(viESA, (ViBuf)cResult, sizeof(cResult), &nRetCount);
The viRead command will generate an error to the effect that there is insufficient memory. Sorry, I no longer have the oscilloscope on site and can't get the exact error. Attempts to set the read buffer don't help.
Thanks,
Steve
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Reduce the number of Buffer Allocations
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Let me give you some background onto my approach before getting into my issues: I create a waveform and send it to a PXI-6552 for generation. At the same time that it outputs this waveform, it is also acquiring another waveform. I process this acquired waveform's information and then save it to disk. This loops over and over.
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If someone helped you out, please select their post as the solution and/or give them Kudos!That was very informative.
I also stumbled upon this by jumping from link to link in the help documents http://zone.ni.com/reference/en-XX/help/371361H-01/lvconcepts/vi_memory_usage/. So I am reading through this now!
I also considered running it on a more microscopic scale just to see how rapidly the memory will grow. It still might be worthwhile to test.
My question about the "buffers":
In a textual programming language, I believe I could re-use almost all of the allocated memory without duplication. Is there a way to analyze the code to check where or if new memory is being allocated? And is it possible to enforce a waveform data type (I believe its just a cluster) of size X to be over written next iteration by the new waveform data type also of size X? Or do you believe this might already be happening?
EDIT:
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Within the actual loop, I use the NI HSDIO to send the same waveform every iteration to the PXI. I use NI HSDIO Fetch Waveform to return a DWDT (digital waveform data type) which is the same size as the original waveform but naturally with different elements.
I post process this DWDT by converting it to boolean with Digital to Boolean Array VI, a few build arrays, array transpose'es, and comparsion functions.
Lastly I convert this boolean array into a string of 0's and 1's and then substrings from this string. (Around 10 per iteration). These 10 substrings are converted to decimal numbers which are built into an array that is saved to disk with Write Spreadsheet to File .
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