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This patch pulls google/benchmark v1.4.1 into the LLVM tree so that any project could use it for benchmark generation. A dummy benchmark is added to `llvm/benchmarks/DummyYAML.cpp` to validate the correctness of the build process. The current version does not utilize LLVM LNT and LLVM CMake infrastructure, but that might be sufficient for most users. Two introduced CMake variables: * `LLVM_INCLUDE_BENCHMARKS` (`ON` by default) generates benchmark targets * `LLVM_BUILD_BENCHMARKS` (`OFF` by default) adds generated benchmark targets to the list of default LLVM targets (i.e. if `ON` benchmarks will be built upon standard build invocation, e.g. `ninja` or `make` with no specific targets) List of modifications: * `BENCHMARK_ENABLE_TESTING` is disabled * `BENCHMARK_ENABLE_EXCEPTIONS` is disabled * `BENCHMARK_ENABLE_INSTALL` is disabled * `BENCHMARK_ENABLE_GTEST_TESTS` is disabled * `BENCHMARK_DOWNLOAD_DEPENDENCIES` is disabled Original discussion can be found here: http://lists.llvm.org/pipermail/llvm-dev/2018-August/125023.html Reviewed by: dberris, lebedev.ri Subscribers: ilya-biryukov, ioeric, EricWF, lebedev.ri, srhines, dschuff, mgorny, krytarowski, fedor.sergeev, mgrang, jfb, llvm-commits Differential Revision: https://reviews.llvm.org/D50894 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340809 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
#ifndef BENCHMARK_THREAD_TIMER_H
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#define BENCHMARK_THREAD_TIMER_H
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#include "check.h"
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#include "timers.h"
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namespace benchmark {
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namespace internal {
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class ThreadTimer {
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public:
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ThreadTimer() = default;
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// Called by each thread
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void StartTimer() {
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running_ = true;
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start_real_time_ = ChronoClockNow();
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start_cpu_time_ = ThreadCPUUsage();
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}
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// Called by each thread
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void StopTimer() {
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CHECK(running_);
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running_ = false;
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real_time_used_ += ChronoClockNow() - start_real_time_;
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// Floating point error can result in the subtraction producing a negative
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// time. Guard against that.
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cpu_time_used_ += std::max<double>(ThreadCPUUsage() - start_cpu_time_, 0);
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}
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// Called by each thread
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void SetIterationTime(double seconds) { manual_time_used_ += seconds; }
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bool running() const { return running_; }
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// REQUIRES: timer is not running
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double real_time_used() {
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CHECK(!running_);
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return real_time_used_;
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}
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// REQUIRES: timer is not running
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double cpu_time_used() {
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CHECK(!running_);
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return cpu_time_used_;
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}
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// REQUIRES: timer is not running
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double manual_time_used() {
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CHECK(!running_);
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return manual_time_used_;
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}
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private:
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bool running_ = false; // Is the timer running
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double start_real_time_ = 0; // If running_
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double start_cpu_time_ = 0; // If running_
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// Accumulated time so far (does not contain current slice if running_)
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double real_time_used_ = 0;
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double cpu_time_used_ = 0;
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// Manually set iteration time. User sets this with SetIterationTime(seconds).
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double manual_time_used_ = 0;
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};
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} // namespace internal
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} // namespace benchmark
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#endif // BENCHMARK_THREAD_TIMER_H
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