From 47076e3c7c22fc7557f388ad3d47228b922da71e Mon Sep 17 00:00:00 2001 From: Pádraig Brady Date: Tue, 20 Jul 2010 18:51:01 +0100 Subject: provide POSIX_FADV_SEQUENTIAL hint to appropriate utils Following on from commit dae35bac, 01-03-2010, "sort: inform the system about our input access pattern" apply the same hint to all appropriate utils. This currently gives around a 5% speedup for reading large files from fast flash devices on GNU/Linux. * src/base64.c: Call fadvise (..., FADVISE_SEQUENTIAL); * src/cat.c: Likewise. * src/cksum.c: Likewise. * src/comm.c: Likewise. * src/cut.c: Likewise. * src/expand.c: Likewise. * src/fmt.c: Likewise. * src/fold.c: Likewise. * src/join.c: Likewise. * src/md5sum.c: Likewise. * src/nl.c: Likewise. * src/paste.c: Likewise. * src/pr.c: Likewise. * src/ptx.c: Likewise. * src/shuf.c: Likewise. * src/sum.c: Likewise. * src/tee.c: Likewise. * src/tr.c: Likewise. * src/tsort.c: Likewise. * src/unexpand.c: Likewise. * src/uniq.c: Likewise. * src/wc.c: Likewise, unless we don't actually read(). --- src/fold.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'src/fold.c') diff --git a/src/fold.c b/src/fold.c index 9364a03f9..d5858568c 100644 --- a/src/fold.c +++ b/src/fold.c @@ -24,6 +24,7 @@ #include "system.h" #include "error.h" +#include "fadvise.h" #include "quote.h" #include "xstrtol.h" @@ -142,6 +143,8 @@ fold_file (char const *filename, size_t width) return false; } + fadvise (stdin, FADVISE_SEQUENTIAL); + while ((c = getc (istream)) != EOF) { if (offset_out + 1 >= allocated_out) -- cgit v1.2.3-54-g00ecf