From 47076e3c7c22fc7557f388ad3d47228b922da71e Mon Sep 17 00:00:00 2001
From: Pádraig Brady <P@draigBrady.com>
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/tr.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/tr.c')

diff --git a/src/tr.c b/src/tr.c
index 3722b4d84..a5b68106b 100644
--- a/src/tr.c
+++ b/src/tr.c
@@ -25,6 +25,7 @@
 
 #include "system.h"
 #include "error.h"
+#include "fadvise.h"
 #include "quote.h"
 #include "safe-read.h"
 #include "xfreopen.h"
@@ -1754,6 +1755,8 @@ main (int argc, char **argv)
   if (O_BINARY && ! isatty (STDOUT_FILENO))
     xfreopen (NULL, "wb", stdout);
 
+  fadvise (stdin, FADVISE_SEQUENTIAL);
+
   if (squeeze_repeats && non_option_args == 1)
     {
       set_initialize (s1, complement, in_squeeze_set);
-- 
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