numfiles and scandir are two new performance utilities.

Author: pme

.gitignore

@@ -4,6 +4,8 @@ dg
 pr
 rd
 id
+scandir
+numfiles
 readn
 writen
 ictest

Makefile

@@ -31,7 +31,7 @@
 # =====================================================================================
 #
 
-PROGRAMS = dg pr rd id
+PROGRAMS = dg pr rd id numfiles scandir
 CFLAGS = -Wall -g -DUSE_FLOCK
 LDFLAGS = -lm
 
@@ -57,3 +57,8 @@ rd: rd.c mh.c
 id: id.c
 	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
 
+numfiles: numfiles.c
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+scandir: scandir.c
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)

numfiles.c

@@ -0,0 +1,66 @@
+/* vim: set ts=2 sw=2:
+ * =====================================================================================
+ *
+ *       Filename:  numfiles.c
+ *
+ *    Description:  File generator
+ *
+ *        Version:  1.0
+ *        Created:  2012-01-10 15:47
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Peter Meszaros (pme), [email protected]
+ *        Company:  Infalk Co.
+ *
+ * =====================================================================================
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * =====================================================================================
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <err.h>
+#include <libgen.h>
+
+int main(int argc, char *argv[])
+{
+	int i;
+	int n = atoi(argv[1]);
+
+  if (argc != 3)
+		errx(EXIT_FAILURE, "Usage: %s numfiles dirname", basename(argv[0]));
+
+	for(i=1; i < n; i++) {
+		int fd;
+		char filename[1024];
+
+    snprintf(filename, 1024, "%s/%010d", argv[2], i);
+
+		if ((fd = open(filename, O_CREAT, 0644)) == -1)
+			err(EXIT_FAILURE, "open(%s)", filename);
+
+		close(fd);
+
+		if (!(i % 1000)) printf("%d files created\n", i);
+	}
+
+	return 0;
+}

scandir.c

@@ -0,0 +1,81 @@
+/* vim: set ts=2 sw=2:
+ * =====================================================================================
+ *
+ *       Filename:  scandir.c
+ *
+ *    Description:  Directory scanner
+ *
+ *        Version:  1.0
+ *        Created:  2012-01-10 15:50
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Peter Meszaros (pme), [email protected]
+ *        Company:  Infalk Co.
+ *
+ * =====================================================================================
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * =====================================================================================
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <sys/time.h>
+#include <err.h>
+#include <libgen.h>
+
+int min, max;
+
+int filter(const struct dirent *de)
+{
+	int n = atoi(de->d_name);
+
+  return (n >= min && n <= max) ? 1 : 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int dn;
+	int i;
+  struct dirent **de = NULL;
+	struct timeval fm, to, d;
+
+  if (argc != 4)
+		errx(EXIT_FAILURE, "Usage: %s min max dirpath", basename(argv[0]));
+
+  min = atoi(argv[1]);
+  max = atoi(argv[2]);
+
+  gettimeofday(&fm, NULL);
+
+  if ((dn = scandir(argv[3], &de, filter, versionsort)) == -1)
+		err(EXIT_FAILURE, "scandir(%s)", argv[3]);
+
+  gettimeofday(&to, NULL);
+
+  timersub(&to, &fm, &d);
+	fprintf(stderr, "time: %ld.%06ld\n", d.tv_sec, d.tv_usec);
+
+  for (i=0; i<dn; i++) {
+		printf("%d - '%s'\n", i, de[i]->d_name);
+	}
+
+  free(de);
+
+	return 0;
+}