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 23int 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