On Sun, Dec 30, 2018, 10:03 PM Amit Agarwal <amit@amit-agarwal.co.in wrote:

Hi All,

I am trying to understand memory fragmentation and how to understand and/or analyze the same.

Is there some detailed documentation on pagetypeinfo and buddyinfo files present in the proc directory? Am I looking at right files to understand if the memory is fragmented.

Problem Description:

One of the applications does a few 200-300Mb calloc's during start-up. On one of the production servers, the application does not start up although there should be enough RAM available for application to start. I am suspecting that this is because of fragmentation and would like to confirm the same.

How do you know it is because of memory ? If you have sufficient RAM then it should be able to allocate. Does you application fail with ENOMEM ?

Without knowing the error code from application it's hard to suggest anything.

--

Thanks,
-aka

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