On quarta-feira, 4 de setembro de 2013 06:32:54, Syam Krishnan wrote: > I think the point was that since std::vector is a wrapper around an > array, it'd require a *contiguous* block of memory - which might not be > available even though there's sufficient RAM. Anyway, you should know > your system better.
If you are running a 64-bit application, it's highly unlikely to not find a contiguous block of memory available of any size, as long as there is memory available to back that memory block. In current hardware. For example, on x86-64, the processors can do 47 bits of virtual memory[*], but the machines can only address 40 bits of real memory. That means there's 128 times more available virtual space than the largest memory block you could allocate. Other 64-bit architectures are similar, with maybe different number of bits. For example, the Intel Itanium 2 has 50 bits of physical memory addressing and all 64 bits of virtual memory addressing. [*] it's actually 48 bits, but bits 47 to 63 must be identical, so the addressable memory is actually two very, very far away blocks. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center
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