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by evan_miller
4202 days ago
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The semantics for write(2) and mmap(2) differ. Neither can be used to implement the other in full. It's possible to have access patterns which don't demonstrate the efficiencies of mmap but it would be incorrect to suggest they do not exist. The overhead of making a syscall to access an area of a file and copying the data being accessed is significant for many workloads. |
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