c++ - why malloc always failed allocate memory (roughtly 9GB but I have 16GB physical memory)? -

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i believe have enough memory (16g) allocation in ubuntu (64 bit application). still return null.

following memory information running free command.

             total       used       free     shared    buffers     cached mem:      16376100    3295024   13081076      41936      88852    1073808 -/+ buffers/cache:    2132364   14243736 swap:     15998972          0   15998972

screenshot:

http://i.stack.imgur.com/qjw27.png

based on comment, figured out. that's because when calculate memory size, sum overflowed.

another case use int n_dataset = 2453688725; overflowed, n_dataset negative number.


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