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Returns a reasonable default size for page_allocator, typically the closest page size from page_sizes() to 1Mb.
size_t utils::file_buffer_default_size()
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A value of a TLB large page size close to 1Mb.
#include <boost/afio/v2/afio.hpp>
Whatever the system API takes (one would hope constant time).
Any error from the operating system or std::bad_alloc.