[Insight-developers] Test for large image buffer convert

[Sean McBride]

On 8/10/09 4:40 PM, Luis Ibanez said:

>We already have other tests in this category:
>
>       Tests that require 64bits and a large RAM.
>
>We enable them conditionally by using the CMake flag:
>
>        ITK_COMPUTER_MEMORY_SIZE
>
>with expressions such as:
>
>IF( ${ITK_COMPUTER_MEMORY_SIZE} GREATER 12 )
>
>  # Image of 9.12 Gigabytes (pixels size is 16bits)
>  ADD_TEST(itkLargeImageWriteReadTest3 ${IO_TESTS}
>itkLargeImageWriteReadTest
>           ${ITK_TEST_OUTPUT_DIR}/LargeImage03.mhd  70000L )
>
>ENDIF( ${ITK_COMPUTER_MEMORY_SIZE} GREATER 12 )

Is the idea here to reduce virtual memory thrashing?  On any modern OS
that test could still be run even with insufficient physical RAM (albeit
slowly).

Should ITK_COMPUTER_MEMORY_SIZE state the amount of physical RAM in the
machine?  What if my machine has 8 GB of physical RAM but my OS is only
32 bit (and thus a process is limited to max 4 GB RAM)?  Would that
cause the test to run, but then crash?

Thanks,

-- 
____________________________________________________________
Sean McBride, B. Eng                 sean at rogue-research.com
Rogue Research                        www.rogue-research.com 
Mac Software Developer              Montréal, Québec, Canada