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issue #3978: improve st_utime's default impl.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| // | ||
| // Copyright (c) 2013-2024 The SRS Authors | ||
| // | ||
| // SPDX-License-Identifier: MIT | ||
| // | ||
| #include <srs_utest_st.hpp> | ||
| #include <sys/time.h> | ||
| #include <time.h> | ||
| #include <unistd.h> | ||
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| using namespace std; | ||
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| VOID TEST(StTest, StUtimeInMicroseconds) | ||
| { | ||
| st_utime_t st_time_1 = st_utime(); | ||
| // sleep 1 microsecond | ||
| usleep(1); | ||
| st_utime_t st_time_2 = st_utime(); | ||
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| EXPECT_GT(st_time_1, 0); | ||
| EXPECT_GT(st_time_2, 0); | ||
| EXPECT_GT(st_time_2, st_time_1); | ||
| // st_time_2 - st_time_1 should be in range of [1, 100] microseconds | ||
| EXPECT_GE(st_time_2 - st_time_1, 1); | ||
| EXPECT_LE(st_time_2 - st_time_1, 100); | ||
| } | ||
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| static inline st_utime_t time_gettimeofday() { | ||
| struct timeval tv; | ||
| gettimeofday(&tv, NULL); | ||
| return (tv.tv_sec * 1000000LL + tv.tv_usec); | ||
| } | ||
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| VOID TEST(StTest, StUtimePerformance) | ||
| { | ||
| clock_t start; | ||
| int gettimeofday_elapsed_time = 0; | ||
| int st_utime_elapsed_time = 0; | ||
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| // Both the st_utime(clock_gettime or gettimeofday) and gettimeofday's | ||
| // elpased time to execute is dependence on whether it is the first time be called. | ||
| // In general, the gettimeofday has better performance, but the gap between | ||
| // them is really small, maybe less than 10 clock ~ 10 microseconds. | ||
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| // check st_utime first, then gettimeofday | ||
| { | ||
| start = clock(); | ||
| st_utime_t t2 = st_utime(); | ||
| int elapsed_time = clock() - start; | ||
| st_utime_elapsed_time += elapsed_time; | ||
| EXPECT_GT(t2, 0); | ||
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| start = clock(); | ||
| st_utime_t t1 = time_gettimeofday(); | ||
| elapsed_time = clock() - start; | ||
| gettimeofday_elapsed_time += elapsed_time; | ||
| EXPECT_GT(t1, 0); | ||
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| EXPECT_GE(gettimeofday_elapsed_time, 0); | ||
| EXPECT_GE(st_utime_elapsed_time, 0); | ||
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| // pass the test, if | ||
| EXPECT_LT(gettimeofday_elapsed_time > st_utime_elapsed_time ? | ||
| gettimeofday_elapsed_time - st_utime_elapsed_time : | ||
| st_utime_elapsed_time - gettimeofday_elapsed_time, 10); | ||
| } | ||
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| // check gettimeofday first, then st_utime | ||
| { | ||
| start = clock(); | ||
| st_utime_t t1 = time_gettimeofday(); | ||
| int elapsed_time = clock() - start; | ||
| gettimeofday_elapsed_time += elapsed_time; | ||
| EXPECT_GT(t1, 0); | ||
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| start = clock(); | ||
| st_utime_t t2 = st_utime(); | ||
| elapsed_time = clock() - start; | ||
| st_utime_elapsed_time += elapsed_time; | ||
| EXPECT_GT(t2, 0); | ||
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| EXPECT_GE(gettimeofday_elapsed_time, 0); | ||
| EXPECT_GE(st_utime_elapsed_time, 0); | ||
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| EXPECT_LT(gettimeofday_elapsed_time > st_utime_elapsed_time ? | ||
| gettimeofday_elapsed_time - st_utime_elapsed_time : | ||
| st_utime_elapsed_time - gettimeofday_elapsed_time, 10); | ||
| } | ||
|
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||
| // compare st_utime & gettimeofday in a loop | ||
| for (int i = 0; i < 100; i++) { | ||
| start = clock(); | ||
| st_utime_t t2 = st_utime(); | ||
| int elapsed_time = clock() - start; | ||
| st_utime_elapsed_time = elapsed_time; | ||
| EXPECT_GT(t2, 0); | ||
| usleep(1); | ||
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| start = clock(); | ||
| st_utime_t t1 = time_gettimeofday(); | ||
| elapsed_time = clock() - start; | ||
| gettimeofday_elapsed_time = elapsed_time; | ||
| EXPECT_GT(t1, 0); | ||
| usleep(1); | ||
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| EXPECT_GE(gettimeofday_elapsed_time, 0); | ||
| EXPECT_GE(st_utime_elapsed_time, 0); | ||
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| EXPECT_LT(gettimeofday_elapsed_time > st_utime_elapsed_time ? | ||
| gettimeofday_elapsed_time - st_utime_elapsed_time : | ||
| st_utime_elapsed_time - gettimeofday_elapsed_time, 10); | ||
|
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||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| // | ||
| // Copyright (c) 2013-2024 The SRS Authors | ||
| // | ||
| // SPDX-License-Identifier: MIT | ||
| // | ||
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| #ifndef SRS_UTEST_ST_HPP | ||
| #define SRS_UTEST_ST_HPP | ||
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| #include <srs_utest.hpp> | ||
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| #include <st.h> | ||
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| #endif // SRS_UTEST_ST_HPP | ||
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