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author | Pádraig Brady <P@draigBrady.com> | 2010-07-20 18:51:01 +0100 |
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committer | Pádraig Brady <P@draigBrady.com> | 2010-07-22 01:04:47 +0100 |
commit | 47076e3c7c22fc7557f388ad3d47228b922da71e (patch) | |
tree | 94f785d628a11e6c786f5aa85daa88d2a672b2fe /src/expand.c | |
parent | 63b5e8164847285f5d3c1dbc9f7c41ad8c17ccc6 (diff) | |
download | coreutils-47076e3c7c22fc7557f388ad3d47228b922da71e.tar.xz |
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().
Diffstat (limited to 'src/expand.c')
-rw-r--r-- | src/expand.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/expand.c b/src/expand.c index be50063b6..249255d15 100644 --- a/src/expand.c +++ b/src/expand.c @@ -40,6 +40,7 @@ #include <sys/types.h> #include "system.h" #include "error.h" +#include "fadvise.h" #include "quote.h" #include "xstrndup.h" @@ -243,13 +244,14 @@ next_file (FILE *fp) if (STREQ (file, "-")) { have_read_stdin = true; - prev_file = file; - return stdin; + fp = stdin; } - fp = fopen (file, "r"); + else + fp = fopen (file, "r"); if (fp) { prev_file = file; + fadvise (fp, FADVISE_SEQUENTIAL); return fp; } error (0, errno, "%s", file); |