30 Sep '17, 4am

Visualizing Your Ruby Heap #ruby #rails

Pages aren’t exactly 2 ^ 14 bytes. When we allocate a page, we want that page to be aligned with Operating System memory pages, so the total malloc’d size needs to be some number less than a multiple of 4kb (which is the OS page size). Since the malloc system call has some overhead, we have to subtract some some amount from the actual malloc’d size so that the Ruby page aligns and fits on contiguous OS pages. The padding size we use is sizeof(size_t) * 5 . So the size of a page is actually (2 ^ 14) - (sizeof(size_t) * 5)

Full article: http://tenderlovemaking.com/2017/09/27/visualizing-your-r...

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