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/base64.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/base64.c')

diff --git a/src/base64.c b/src/base64.c
index fddb61c9d..1a36c9183 100644
--- a/src/base64.c
+++ b/src/base64.c
@@ -26,6 +26,7 @@
 
 #include "system.h"
 #include "error.h"
+#include "fadvise.h"
 #include "xstrtol.h"
 #include "quote.h"
 #include "quotearg.h"
@@ -302,6 +303,8 @@ main (int argc, char **argv)
         error (EXIT_FAILURE, errno, "%s", infile);
     }
 
+  fadvise (input_fh, FADVISE_SEQUENTIAL);
+
   if (decode)
     do_decode (input_fh, stdout, ignore_garbage);
   else
-- 
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