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QBenchlib/Perf: use WalltimeNanoseconds for the task time

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Avoids the special case in the code and removes the need to run a large
number of iterations to get any useful result, plus makes it's more
readable:

From:
    0.00002125 msecs per iteration (total: 2,125, iterations: 100000000)

To:
    22.082 nsecs per iteration (total: 22,082, iterations: 1000)

Pick-to: 6.4
Change-Id: I3c79b7e08fa346988dfefffd171facc98af9e9fc
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
This commit is contained in:
Thiago Macieira 2022-10-19 21:32:48 -07:00
parent 483ae6c448
commit e693a5ccaf
1 changed files with 4 additions and 8 deletions
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12
src/testlib/qbenchmarkperfevents.cpp
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@ -128,8 +128,8 @@ bool QBenchmarkPerfEventsMeasurer::isAvailable()
HARDWARE BUS_CYCLES BusCycles bus-cycles
HARDWARE STALLED_CYCLES_FRONTEND StalledCycles stalled-cycles-frontend idle-cycles-frontend
HARDWARE STALLED_CYCLES_BACKEND StalledCycles stalled-cycles-backend idle-cycles-backend
SOFTWARE CPU_CLOCK WalltimeMilliseconds cpu-clock
SOFTWARE TASK_CLOCK WalltimeMilliseconds task-clock
SOFTWARE CPU_CLOCK WalltimeNanoseconds cpu-clock
SOFTWARE TASK_CLOCK WalltimeNanoseconds task-clock
SOFTWARE PAGE_FAULTS PageFaults page-faults faults
SOFTWARE PAGE_FAULTS_MAJ MajorPageFaults major-faults
SOFTWARE PAGE_FAULTS_MIN MinorPageFaults minor-faults
@ -309,7 +309,7 @@ static const Events eventlist[] = {
{ 170, PERF_TYPE_HARDWARE, PERF_COUNT_HW_CACHE_MISSES, QTest::CacheMisses },
{ 183, PERF_TYPE_HARDWARE, PERF_COUNT_HW_CACHE_REFERENCES, QTest::CacheReferences },
{ 200, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_CONTEXT_SWITCHES, QTest::ContextSwitches },
{ 217, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_CPU_CLOCK, QTest::WalltimeMilliseconds },
{ 217, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_CPU_CLOCK, QTest::WalltimeNanoseconds },
{ 227, PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES, QTest::CPUCycles },
{ 238, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_CPU_MIGRATIONS, QTest::CPUMigrations },
{ 253, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_CONTEXT_SWITCHES, QTest::ContextSwitches },
@ -378,7 +378,7 @@ static const Events eventlist[] = {
{ 1292, PERF_TYPE_HARDWARE, PERF_COUNT_HW_REF_CPU_CYCLES, QTest::RefCPUCycles },
{ 1303, PERF_TYPE_HARDWARE, PERF_COUNT_HW_STALLED_CYCLES_BACKEND, QTest::StalledCycles },
{ 1326, PERF_TYPE_HARDWARE, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND, QTest::StalledCycles },
{ 1350, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_TASK_CLOCK, QTest::WalltimeMilliseconds },
{ 1350, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_TASK_CLOCK, QTest::WalltimeNanoseconds },
{ 0, PERF_TYPE_MAX, 0, QTest::Events }
};
/* -- END GENERATED CODE -- */
@ -570,10 +570,6 @@ static quint64 rawReadValue(int fd)
qint64 QBenchmarkPerfEventsMeasurer::readValue()
{
quint64 raw = rawReadValue(fd);
if (metricType() == QTest::WalltimeMilliseconds) {
// perf returns nanoseconds
return raw / 1000000;
}
return raw;
}