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().

1 files changed, 3 insertions, 0 deletions

diff --git a/src/cut.c b/src/cut.c
index 5fcf0743a..58776d991 100644
--- a/src/cut.c
+++ b/src/cut.c
@@ -31,6 +31,7 @@
 #include "system.h"
 
 #include "error.h"
+#include "fadvise.h"
 #include "getndelim2.h"
 #include "hash.h"
 #include "quote.h"
@@ -733,6 +734,8 @@ cut_file (char const *file)
         }
     }
 
+  fadvise (stream, FADVISE_SEQUENTIAL);
+
   cut_stream (stream);
 
   if (ferror (stream))