1 /*
2 ** Copyright 2008 The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 ** http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17 #include <stdlib.h>
18 #include <stdio.h>
19 #include <errno.h>
20 #include <sys/time.h>
21 #include <sys/uio.h>
22 #include <unistd.h>
23
main(int argc,char ** argv)24 int main(int argc, char **argv) {
25 int i;
26
27 struct timeval tv1;
28 struct timeval tv2;
29 long max = 0;
30 long avg = 0;
31
32 for(i = 1; ; i++) {
33 gettimeofday(&tv1, NULL);
34 usleep(1000);
35 gettimeofday(&tv2, NULL);
36
37 long usec = (tv2.tv_sec - tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec;
38 avg += usec;
39
40 if (usec > max) max = usec;
41 if (!(i % 1000)) {
42 avg /= 1000;
43 printf("max %ld\tavg %ld\n", max, avg);
44 max = 0;
45 avg = 0;
46 }
47 }
48 return 0;
49 }
50