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authorMorph <39850852+Morph1984@users.noreply.github.com>2021-12-02 22:12:23 +0100
committerMorph <39850852+Morph1984@users.noreply.github.com>2021-12-04 01:55:59 +0100
commitf919498f8f4e36477d8ea3424f9ecbfae7576340 (patch)
tree62352f05a6bd485ee4d67703433294fa86309b9d /src/common/x64
parentMerge pull request #7489 from Morph1984/steady-clock (diff)
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Diffstat (limited to 'src/common/x64')
-rw-r--r--src/common/x64/native_clock.cpp36
1 files changed, 18 insertions, 18 deletions
diff --git a/src/common/x64/native_clock.cpp b/src/common/x64/native_clock.cpp
index 28f834443..82ee2c8a1 100644
--- a/src/common/x64/native_clock.cpp
+++ b/src/common/x64/native_clock.cpp
@@ -15,26 +15,26 @@
namespace Common {
u64 EstimateRDTSCFrequency() {
- const auto milli_10 = std::chrono::milliseconds{10};
- // get current time
+ // Discard the first result measuring the rdtsc.
_mm_mfence();
- const u64 tscStart = __rdtsc();
- const auto startTime = std::chrono::steady_clock::now();
- // wait roughly 3 seconds
- while (true) {
- auto milli = std::chrono::duration_cast<std::chrono::milliseconds>(
- std::chrono::steady_clock::now() - startTime);
- if (milli.count() >= 3000)
- break;
- std::this_thread::sleep_for(milli_10);
- }
- const auto endTime = std::chrono::steady_clock::now();
+ __rdtsc();
+ std::this_thread::sleep_for(std::chrono::milliseconds{1});
+ _mm_mfence();
+ __rdtsc();
+
+ // Get the current time.
+ const auto start_time = std::chrono::steady_clock::now();
+ _mm_mfence();
+ const u64 tsc_start = __rdtsc();
+ // Wait for 200 milliseconds.
+ std::this_thread::sleep_for(std::chrono::milliseconds{200});
+ const auto end_time = std::chrono::steady_clock::now();
_mm_mfence();
- const u64 tscEnd = __rdtsc();
- // calculate difference
- const u64 timer_diff =
- std::chrono::duration_cast<std::chrono::nanoseconds>(endTime - startTime).count();
- const u64 tsc_diff = tscEnd - tscStart;
+ const u64 tsc_end = __rdtsc();
+ // Calculate differences.
+ const u64 timer_diff = static_cast<u64>(
+ std::chrono::duration_cast<std::chrono::nanoseconds>(end_time - start_time).count());
+ const u64 tsc_diff = tsc_end - tsc_start;
const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff);
return tsc_freq;
}