You’re writing software that processes data, and it works fine when you test it on a small sample file. But when you load the real data, your program crashes.
The problem is that you don’t have enough memory—if you have 16GB of RAM, you can’t load a 100GB file. At some point the operating system will run out of memory, fail to allocate, and there goes your program.
Trần Ngọc Minh Notes 
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