AcqKnowledge 64-bit and Biopac Student Lab 32-bit
There are multiple cases (configs) related to the issue of Memory/HardDrive/32bit-64bit limitations
AcqKnowledge 64-bit offers big improvements in terms of file size and memory limitation
BSL 4.1.2 or above
File and memory functions are unchanged at 2 GigaSamples of length and 4 GBytes of file size. BSL 4.1.2 or above can allocate max 2 GBytes of RAM for transformations.
Use the following equation to calculate the memory required for your acquisition:
Memory required (bytes) = [(8C + 2A) x S x T] + 1 MB*C = Number of calculation channelsA = Number of analog channelsS = Sample rate (samples/second)T = Recording time (acquisition length; when sample rate is samples per second, T is in SECONDS)* 1 MB = MINIMUM memory overhead required to store file information
- Journals, events, and other information are variable and will also require more disk space.
- Once analog channels are filtered or otherwise transformed, the required amount of storage will increase to 8 bytes per sample, identical to calculation channels.
- It is not possible to perform any transformations for acquisitions where converting analog channels to floating point will exceed 2 GB.
- Memory overhead requirement may increase significantly with
- many events with long labels
- long and rich-formatted journal
- opened DataViews
- MetaChannels – overhead includes Hardware Settings and MetaChannels support (max 16 metachannels per each of 16 calc channels –> 256 “calc” channels)
- Smart Amplifier information as part of Hardware Settings section of graphfile take storage
Note that all 16 digital channels allocate 2 bytes (16 bit – 1 bit per digital channel). So, having at least 1 digital channel ON will cause allocation of 2 bytes per sample.
Refer to the software guide available under the program Help menu for setup and analysis guidelines when working with large files.
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