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/uio.h>
21 #include <unistd.h>
22
main(int argc,char ** argv)23 int main(int argc, char **argv) {
24 int i;
25
26 struct timeval tv1;
27 struct timeval tv2;
28 long max = 0;
29 long avg = 0;
30
31 for(i = 1; ; i++) {
32 gettimeofday(&tv1, NULL);
33 usleep(1000);
34 gettimeofday(&tv2, NULL);
35
36 long usec = (tv2.tv_sec - tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec;
37 avg += usec;
38
39 if (usec > max) max = usec;
40 if (!(i % 1000)) {
41 avg /= 1000;
42 printf("max %ld\tavg %ld\n", max, avg);
43 max = 0;
44 avg = 0;
45 }
46 }
47 return 0;
48 }
49