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| 1 | +// |
| 2 | +// Copyright (c) 2013-2024 The SRS Authors |
| 3 | +// |
| 4 | +// SPDX-License-Identifier: MIT |
| 5 | +// |
| 6 | +#include <srs_utest_st.hpp> |
| 7 | +#include <sys/time.h> |
| 8 | +#include <time.h> |
| 9 | +#include <unistd.h> |
| 10 | + |
| 11 | +using namespace std; |
| 12 | + |
| 13 | +VOID TEST(StTest, StUtimeInMicroseconds) |
| 14 | +{ |
| 15 | + st_utime_t st_time_1 = st_utime(); |
| 16 | + // sleep 1 microsecond |
| 17 | +#if !defined(SRS_CYGWIN64) |
| 18 | + usleep(1); |
| 19 | +#endif |
| 20 | + st_utime_t st_time_2 = st_utime(); |
| 21 | + |
| 22 | + EXPECT_GT(st_time_1, 0); |
| 23 | + EXPECT_GT(st_time_2, 0); |
| 24 | + EXPECT_GT(st_time_2, st_time_1); |
| 25 | + // st_time_2 - st_time_1 should be in range of [1, 100] microseconds |
| 26 | + EXPECT_GE(st_time_2 - st_time_1, 1); |
| 27 | + EXPECT_LE(st_time_2 - st_time_1, 100); |
| 28 | +} |
| 29 | + |
| 30 | +static inline st_utime_t time_gettimeofday() { |
| 31 | + struct timeval tv; |
| 32 | + gettimeofday(&tv, NULL); |
| 33 | + return (tv.tv_sec * 1000000LL + tv.tv_usec); |
| 34 | +} |
| 35 | + |
| 36 | +VOID TEST(StTest, StUtimePerformance) |
| 37 | +{ |
| 38 | + clock_t start; |
| 39 | + int gettimeofday_elapsed_time = 0; |
| 40 | + int st_utime_elapsed_time = 0; |
| 41 | + |
| 42 | + // Both the st_utime(clock_gettime or gettimeofday) and gettimeofday's |
| 43 | + // elpased time to execute is dependence on whether it is the first time be called. |
| 44 | + // In general, the gettimeofday has better performance, but the gap between |
| 45 | + // them is really small, maybe less than 10 clock ~ 10 microseconds. |
| 46 | + |
| 47 | + // check st_utime first, then gettimeofday |
| 48 | + { |
| 49 | + start = clock(); |
| 50 | + st_utime_t t2 = st_utime(); |
| 51 | + int elapsed_time = clock() - start; |
| 52 | + st_utime_elapsed_time += elapsed_time; |
| 53 | + EXPECT_GT(t2, 0); |
| 54 | + |
| 55 | + start = clock(); |
| 56 | + st_utime_t t1 = time_gettimeofday(); |
| 57 | + elapsed_time = clock() - start; |
| 58 | + gettimeofday_elapsed_time += elapsed_time; |
| 59 | + EXPECT_GT(t1, 0); |
| 60 | + |
| 61 | + |
| 62 | + EXPECT_GE(gettimeofday_elapsed_time, 0); |
| 63 | + EXPECT_GE(st_utime_elapsed_time, 0); |
| 64 | + |
| 65 | + // pass the test, if |
| 66 | + EXPECT_LT(gettimeofday_elapsed_time > st_utime_elapsed_time ? |
| 67 | + gettimeofday_elapsed_time - st_utime_elapsed_time : |
| 68 | + st_utime_elapsed_time - gettimeofday_elapsed_time, 10); |
| 69 | + } |
| 70 | + |
| 71 | + // check gettimeofday first, then st_utime |
| 72 | + { |
| 73 | + start = clock(); |
| 74 | + st_utime_t t1 = time_gettimeofday(); |
| 75 | + int elapsed_time = clock() - start; |
| 76 | + gettimeofday_elapsed_time += elapsed_time; |
| 77 | + EXPECT_GT(t1, 0); |
| 78 | + |
| 79 | + start = clock(); |
| 80 | + st_utime_t t2 = st_utime(); |
| 81 | + elapsed_time = clock() - start; |
| 82 | + st_utime_elapsed_time += elapsed_time; |
| 83 | + EXPECT_GT(t2, 0); |
| 84 | + |
| 85 | + EXPECT_GE(gettimeofday_elapsed_time, 0); |
| 86 | + EXPECT_GE(st_utime_elapsed_time, 0); |
| 87 | + |
| 88 | + EXPECT_LT(gettimeofday_elapsed_time > st_utime_elapsed_time ? |
| 89 | + gettimeofday_elapsed_time - st_utime_elapsed_time : |
| 90 | + st_utime_elapsed_time - gettimeofday_elapsed_time, 10); |
| 91 | + } |
| 92 | + |
| 93 | + // compare st_utime & gettimeofday in a loop |
| 94 | + for (int i = 0; i < 100; i++) { |
| 95 | + start = clock(); |
| 96 | + st_utime_t t2 = st_utime(); |
| 97 | + int elapsed_time = clock() - start; |
| 98 | + st_utime_elapsed_time = elapsed_time; |
| 99 | + EXPECT_GT(t2, 0); |
| 100 | + usleep(1); |
| 101 | + |
| 102 | + start = clock(); |
| 103 | + st_utime_t t1 = time_gettimeofday(); |
| 104 | + elapsed_time = clock() - start; |
| 105 | + gettimeofday_elapsed_time = elapsed_time; |
| 106 | + EXPECT_GT(t1, 0); |
| 107 | + usleep(1); |
| 108 | + |
| 109 | + EXPECT_GE(gettimeofday_elapsed_time, 0); |
| 110 | + EXPECT_GE(st_utime_elapsed_time, 0); |
| 111 | + |
| 112 | + EXPECT_LT(gettimeofday_elapsed_time > st_utime_elapsed_time ? |
| 113 | + gettimeofday_elapsed_time - st_utime_elapsed_time : |
| 114 | + st_utime_elapsed_time - gettimeofday_elapsed_time, 10); |
| 115 | + |
| 116 | + } |
| 117 | +} |
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