From: Matthew Dillon <dillon@dragonflybsd.org>
Date: Fri, 13 Aug 2004 02:28:42 +0000 (+0000)
Subject: add 'read1', a program that tests reading one byte at a time from a file.
X-Git-Tag: v2.0.1~10536
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/830da3091c91a4b89b0ee33acb27138866df4e45

add 'read1', a program that tests reading one byte at a time from a file.
---

diff --git a/test/sysperf/Makefile b/test/sysperf/Makefile
index 14578fce1c..7cb3a87206 100644
--- a/test/sysperf/Makefile
+++ b/test/sysperf/Makefile
@@ -1,5 +1,5 @@
 #
-# $DragonFly: src/test/sysperf/Makefile,v 1.8 2004/04/29 16:14:53 dillon Exp $
+# $DragonFly: src/test/sysperf/Makefile,v 1.9 2004/08/13 02:28:42 dillon Exp $
 #
 
 TARGETS=/tmp/sc1 /tmp/sc2 /tmp/sc3 /tmp/sc4 \
@@ -86,5 +86,8 @@ all:	$(TARGETS)
 /tmp/mem2: memzero.c memzero.S blib.c
 	$(CC) $(CFLAGS) memzero.c memzero.S blib.c -o /tmp/mem2
 
+/tmp/read1: read1.c blib.c
+	$(CC) $(CFLAGS) read1.c blib.c -o /tmp/read1
+
 clean:
 	rm -f $(TARGETS)
diff --git a/test/sysperf/read1.c b/test/sysperf/read1.c
new file mode 100644
index 0000000000..8065fdcf44
--- /dev/null
+++ b/test/sysperf/read1.c
@@ -0,0 +1,92 @@
+/*
+ * read1.c
+ *
+ * Tests reading 1 byte at a time from a file.
+ *
+ * $DragonFly: src/test/sysperf/read1.c,v 1.1 2004/08/13 02:28:42 dillon Exp $
+ */
+
+#include "blib.h"
+#include <errno.h>
+#include <sys/resource.h>
+#include <sys/fcntl.h>
+
+char Buf[8192];
+
+int
+main(int ac, char **av)
+{
+    int bytes;
+    int fd;
+    int i;
+    int j;
+    char c;
+    char *ptr;
+    const char *filename;
+
+    if (ac == 1) {
+	fprintf(stderr, "%s filesize[k,m]\n", av[0]);
+	exit(1);
+    }
+    bytes = strtol(av[1], &ptr, 0);
+    if (*ptr == 'k' || *ptr == 'K') {
+	bytes *= 1024;
+    } else if (*ptr == 'm' || *ptr == 'M') {
+	bytes *= 1024 * 1024;
+    } else if (*ptr) {
+	fprintf(stderr, "Illegal numerical suffix: %s\n", ptr);
+	exit(1);
+    }
+    if (bytes <= 0) {
+	fprintf(stderr, "I can't handle %d sized buffers\n", bytes);
+	exit(1);
+    }
+
+    filename = "read1.dat";
+    fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
+    if (fd < 0) {
+	if (errno == EROFS) {
+	    filename = "/tmp/read1.dat";
+	    fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
+	}
+	if (fd < 0) {
+	    perror("open()");
+	    exit(1);
+	}
+    }
+    for (i = 0; i < bytes; i += sizeof(Buf)) {
+	int n = (bytes - i > sizeof(Buf)) ? sizeof(Buf) : bytes - i;
+	if (write(fd, Buf, n) != n) {
+	    close(fd);
+	    perror("write()");
+	    remove(filename);
+	    exit(1);
+	}
+    }
+    fsync(fd);
+    fsync(fd);
+    sleep(1);
+    fsync(fd);
+    lseek(fd, 0L, 0);
+    sleep(1);
+
+    start_timing();
+    i = 0;
+    while (stop_timing(0, NULL) == 0) {
+	for (j = 0; j < 256 * 1024; ++j) {
+	    if (read(fd, &c, 1) != 1)
+		lseek(fd, 0L, 0);
+	}
+	i += j;
+    }
+    lseek(fd, 0L, 0);
+    start_timing();
+    for (j = 0; j < i; ++j) {
+	if (read(fd, &c, 1) != 1)
+	    lseek(fd, 0L, 0);
+    }
+    stop_timing(j, "read 1char from file:");
+    remove(filename);
+    return(0);
+}
+