24 • Installing Xtium2-CLHS PX8 Xtium2-CLHS PX8 User's Manual
• Test for any memory error when allocating host buffers. Simply use the Buffer menu of the
Sapera Grab demo program (see Grab Demo Overview) to allocate the number of host buffers
required for your acquisition source. Feel free to test the maximum limit of host buffers possible on
your host system – the Sapera Grab demo will not crash when the requested number of host frame
buffers is not allocated.
The following calculation is an example of the amount of contiguous memory to reserve beyond
5MB with 80,000 buffers of 2048x1024x8:
a) (80000 * 64 bytes)
b) (80000 * 48 bytes)
c) (80000 * (24 + (((2048*1024)/4kB) * 8))) = 323MB
d) Total = a (rounded up to nearest 64kB) + b (rounded up to nearest 64kB) + c (rounded up to
nearest 64kB).
Host Computer Frame Buffer Memory Limitations
When planning a Sapera application and its host frame buffers used, plus other Sapera memory
resources, do not forget the Windows operating system memory needs.
A Sapera application using the preferred scatter gather buffers could consume most of the
remaining system memory, with a large allocation of frame buffers. If using frame buffers allocated
as a single contiguous memory block, Windows will limit the allocation dependent on the installed
system memory. Use the Buffer menu of the Sapera Grab demo program to allocate host buffer
memory until an error message signals the limit allowed by the operating system used.
Contiguous Memory for Sapera Messaging
The current value for Sapera messaging determines the total amount of contiguous memory
reserved at boot time for messages allocation. This memory space stores arguments when calling a
Sapera function. Increase this value if you are using functions with large arguments, such as arrays
and experience any memory errors.
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