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I found that the buffersize passed to progress can make a pretty
sizable different in speed -- at least on a 'dd' test.  The 1k
(BUFSIZ) default buffer size might be handy for really tight
memory requirements, but a larger buffer size gets better pipe
throughput.

So I made a few changes (make the buffer dynamically allocated,
make the buffer size a command-line option, and default the buffer
size to 64k) that I'd like to propose.

Diffs attached.  Comments welcome.

-allen

-- 
Allen Briggs  |  http://www.ninthwonder.com/~briggs/  |  briggs@ninthwonder.com

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? .gdbinit
? progress
? progress.cat1
Index: progress.1
===================================================================
RCS file: /cvsroot/src/usr.bin/progress/progress.1,v
retrieving revision 1.12
diff -p -u -r1.12 progress.1
--- progress.1	12 Apr 2007 06:31:20 -0000	1.12
+++ progress.1	4 Jun 2007 18:30:02 -0000
@@ -30,7 +30,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd April 12, 2007
+.Dd June 4, 2008
 .Dt PROGRESS 1
 .Os
 .Sh NAME
@@ -39,6 +39,7 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl ez
+.Op Fl b Ar buffersize
 .Op Fl f Ar file
 .Op Fl l Ar length
 .Op Fl p Ar prefix
@@ -65,6 +66,11 @@ simply displays a count of the data and 
 .Pp
 The options are as follows:
 .Bl -tag -width XlXlengthXX
+.It Fl b Ar buffersize
+Read in buffers of the specified size (default 64k).
+An optional suffix (per
+.Xr strsuftoll 3 )
+may be given.
 .It Fl e
 Display progress to standard error instead of standard output.
 .It Fl f Ar file
Index: progress.c
===================================================================
RCS file: /cvsroot/src/usr.bin/progress/progress.c,v
retrieving revision 1.14
diff -p -u -r1.14 progress.c
--- progress.c	7 Feb 2007 15:21:21 -0000	1.14
+++ progress.c	4 Jun 2007 18:30:02 -0000
@@ -73,8 +73,9 @@ static void
 usage(void)
 {
 	fprintf(stderr,
-	    "usage: %s [-ez] [-f file] [-l length] [-p prefix] cmd [args...]\n",
-	    getprogname());
+	    "usage: %s [-ez] [-b buffersize] [-f file] [-l length]\n"
+	    "       %*.s [-p prefix] cmd [args...]\n",
+	    getprogname(), (int) strlen(getprogname()), "");
 	exit(EXIT_FAILURE);
 }
 
@@ -82,7 +83,8 @@ usage(void)
 int
 main(int argc, char *argv[])
 {
-	static char fb_buf[BUFSIZ];
+	long long buffersize;
+	char *fb_buf;
 	char *infile = NULL;
 	pid_t pid = 0, gzippid = 0, deadpid;
 	int ch, fd, outpipe[2];
@@ -97,10 +99,16 @@ main(int argc, char *argv[])
 	/* defaults: Read from stdin, 0 filesize (no completion estimate) */
 	fd = STDIN_FILENO;
 	filesize = 0;
+	buffersize = 64 * 1024;
 	prefix = NULL;
 
-	while ((ch = getopt(argc, argv, "ef:l:p:z")) != -1)
+	while ((ch = getopt(argc, argv, "b:ef:l:p:z")) != -1)
 		switch (ch) {
+		case 'b':
+			/* 256MB seems absurdly large */
+			buffersize = strsuftoll("buffer size", optarg,
+			    0, 256 * 1024 * 1024 );
+			break;
 		case 'e':
 			eflag++;
 			break;
@@ -202,6 +210,10 @@ main(int argc, char *argv[])
 	else
 		ttywidth = ts.ts_cols;
 
+	fb_buf = malloc(buffersize);
+	if (fb_buf == NULL)
+		err(1, "malloc for buffersize");
+
 	if (pipe(outpipe) < 0)
 		err(1, "output pipe");
 	pid = fork();
@@ -219,7 +231,7 @@ main(int argc, char *argv[])
 	close(outpipe[0]);
 
 	progressmeter(-1);
-	while ((nr = read(fd, fb_buf, BUFSIZ)) > 0)
+	while ((nr = read(fd, fb_buf, buffersize)) > 0)
 		for (off = 0; nr; nr -= nw, off += nw, bytes += nw)
 			if ((nw = write(outpipe[1], fb_buf + off,
 			    (size_t) nr)) < 0)
@@ -255,5 +267,8 @@ main(int argc, char *argv[])
 	}
 
 	progressmeter(1);
+
+	free(fb_buf);
+
 	exit(cmdstat ? cmdstat : gzipstat);
 }

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