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 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
