Detecting Tests Which Don't Have Enough Workspace

[Joel Sherrill]

On 3/12/2015 6:02 PM, Gedare Bloom wrote:
> On Thu, Mar 12, 2015 at 6:58 PM, Amar Takhar <amar at rtems.org> wrote:
>> On 2015-03-12 12:41 -0500, Joel Sherrill wrote:
>>> Hi
>>>
>>> Many BSPs can link a test but don't actually have enough memory
>>> to run the test. They will fail in the first few lines when the requested
>>> memory for the RTEMS work area is not available. I hacked together
>>> a script which adds together the code, data, bss, work space and
>>> stack space requested. If this exceeds physical memory on the board,
>>> then the test will fail.  It is possible to come close and still run out of
>>> memory during initialization (e.g. malloc, etc) but this approach could
>>> detect some tests which will fail by inspecting them on the host.
>> The waf build prints a warning during compile time that the test will not fit
>> and pass the build.  I was going to add a summary at the end for any tests that
>> won't fit and also add it to a report on BuildBot.
>>
> It includes the workspace size in its estimation of space? Already if
> a test's binary executable size doesn't fit the build will fail at
> link-time.
The workspace is in addition to the .text, .data, and .bss. It is a
calculation
by RTEMS confdefs.h and the linker knows nothing about this memory.

You can detect the code/data not fitting into memory but not when it
fits but creates 1000 tasks with 4K stack each. That adds 4MB to the
test RAM requirements. The workspace number I am pulling out in the
script using gdb is that extra information. If you let it run, the test will
fail very early in boot_card().

This is a second pass filter to avoid running things that will obviously
fail.
>> Amar.
>> _______________________________________________
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>> devel at rtems.org
>> http://lists.rtems.org/mailman/listinfo/devel

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
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