This is a PoC patch that improves archive creation performance at least in certain configurations (ubuntu x64 14.04, virtualized infrastructure, SAN storage) by using posix_fadvise to signal the intent to sequentially read the whole file.
gnulib currently does not provide posix_fadvise. On platforms where posix_fadvise is not available (e.g. my macbook) this patch silently reverts to a noop. Carlo
0001-use-posix_fadvise-to-prefetch-files-when-creating-ar.patch
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