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digitalmars.D - Re: memory-mapped files

Kagamin Wrote:

 May be mm scheme results in more calls to HDD?

from mac optimizations guidelines: http://developer.apple.com/documentation/Performance/Conceptual/FileSystem/Articles/FilePerformance.html #Minimize the number of file operations you perform. For more information, see “Minimize File System Access.” #Group several small I/O transfers into one large transfer. A single write of eight pages is faster than eight separate single-page writes, primarily because it allows the hard disk to write the data in one pass over the disk surface. For more information, see “Choosing an Optimal Transfer Buffer Size.” #Perform sequential reads instead of seeking and reading small blocks of data. The kernel transparently clusters I/O operations, which makes sequential reads much faster.
Feb 24 2009