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 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
