Longlong Yao
ccb3950068
Signed-off-by: Longlong Yao <Longlong.Yao@amd.com> Reviewed-by: lyndonli <Lyndon.Li@amd.com> Reviewed-by: Flora Cui <flora.cui@amd.com> Part-of: <http://10.67.69.192/wsl/libhsakmt/-/merge_requests/7>
112 satır
4.1 KiB
C++
112 satır
4.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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//
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// The University of Illinois/NCSA
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// Open Source License (NCSA)
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//
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// Copyright (c) 2014-2020, Advanced Micro Devices, Inc. All rights reserved.
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//
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// Developed by:
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//
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// AMD Research and AMD HSA Software Development
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//
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// Advanced Micro Devices, Inc.
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//
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// www.amd.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal with the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// - Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimers.
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// - Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimers in
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// the documentation and/or other materials provided with the distribution.
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// - Neither the names of Advanced Micro Devices, Inc,
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// nor the names of its contributors may be used to endorse or promote
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// products derived from this Software without specific prior written
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// permission.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS WITH THE SOFTWARE.
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//
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////////////////////////////////////////////////////////////////////////////////
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#include "core/util/timer.h"
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namespace wsl {
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namespace timer {
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accurate_clock::init::init() {
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freq = os::AccurateClockFrequency();
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accurate_clock::period_ns = 1e9 / double(freq);
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}
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// Calibrates the fast clock using the accurate clock.
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fast_clock::init::init() {
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typedef accurate_clock clock;
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clock::duration delay(std::chrono::milliseconds(1));
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// calibrate clock
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fast_clock::raw_rep min = 0;
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clock::duration elapsed;
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do {
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elapsed = clock::duration::max();
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for (int t = 0; t < 10; t++) {
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fast_clock::raw_rep r1, r2;
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clock::time_point t0, t1, t2, t3;
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t0 = clock::now();
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std::atomic_signal_fence(std::memory_order_acq_rel);
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r1 = fast_clock::raw_now();
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std::atomic_signal_fence(std::memory_order_acq_rel);
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t1 = clock::now();
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std::atomic_signal_fence(std::memory_order_acq_rel);
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do {
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t2 = clock::now();
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} while (t2 - t1 < delay);
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std::atomic_signal_fence(std::memory_order_acq_rel);
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r2 = fast_clock::raw_now();
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std::atomic_signal_fence(std::memory_order_acq_rel);
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t3 = clock::now();
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// If elapsed time is shorter than last recorded time and both the start
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// and end times are confirmed correlated then record the clock readings.
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// This protects against inaccuracy due to thread switching
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if ((t3 - t1 < elapsed) && ((t1 - t0) * 10 < (t2 - t1)) &&
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((t3 - t2) * 10 < (t2 - t1))) {
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elapsed = t3 - t1;
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min = r2 - r1;
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}
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}
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delay += delay;
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} while (min < 1000);
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fast_clock::freq = double(min) / duration_in_seconds(elapsed);
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fast_clock::period_ps = 1e12 / fast_clock::freq;
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// printf("Timer setup took %f ms\n", duration_in_seconds(elapsed)*1000.0f);
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// printf("Fast clock frequency: %f MHz\n", double(fast_clock::freq)/1e6);
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}
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double accurate_clock::period_ns;
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accurate_clock::raw_frequency accurate_clock::freq;
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accurate_clock::init accurate_clock::accurate_clock_init;
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double fast_clock::period_ps;
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fast_clock::raw_frequency fast_clock::freq;
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fast_clock::init fast_clock::fast_clock_init;
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} // namespace timer
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} // namespace wsl
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