From b60f15e0dcfd514521bfc2e33c6f2728f565bc9d Mon Sep 17 00:00:00 2001 From: Juan Carlos Date: Sun, 1 Oct 2023 02:19:37 -0300 Subject: copyFile with POSIX_FADV_SEQUENTIAL (#22776) - Continuation of https://github.com/nim-lang/Nim/pull/22769 - See https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fadvise.html - The code was already there in `std/posix` since years ago. 3 line diff. --------- Co-authored-by: Andreas Rumpf --- lib/std/private/osfiles.nim | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'lib/std/private/osfiles.nim') diff --git a/lib/std/private/osfiles.nim b/lib/std/private/osfiles.nim index b7957fa4f..948df4211 100644 --- a/lib/std/private/osfiles.nim +++ b/lib/std/private/osfiles.nim @@ -203,6 +203,7 @@ proc copyFile*(source, dest: string, options = {cfSymlinkFollow}; bufferSize = 1 ## `-d:nimLegacyCopyFile` is used. ## ## `copyFile` allows to specify `bufferSize` to improve I/O performance. + ## ## See also: ## * `CopyFlag enum`_ ## * `copyDir proc`_ @@ -243,6 +244,13 @@ proc copyFile*(source, dest: string, options = {cfSymlinkFollow}; bufferSize = 1 if not open(d, dest, fmWrite): close(s) raiseOSError(osLastError(), dest) + + # Hints for kernel-level aggressive sequential low-fragmentation read-aheads: + # https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fadvise.html + when defined(linux) or defined(osx): + discard posix_fadvise(getFileHandle(d), 0.cint, 0.cint, POSIX_FADV_SEQUENTIAL) + discard posix_fadvise(getFileHandle(s), 0.cint, 0.cint, POSIX_FADV_SEQUENTIAL) + var buf = alloc(bufferSize) while true: var bytesread = readBuffer(s, buf, bufferSize) -- cgit 1.4.1-2-gfad0 orm class='right' method='get' action='/danisanti/profani-tty/log/CONTRIBUTING.md'>
path: root/CONTRIBUTING.md
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