use second and double precision of timing result

benchmark/preconditioner/preconditioner.cpp

@@ -171,11 +171,8 @@ void run_preconditioner(const char *precond_name,
 
             // the timer is out of the loops to reduce calling synchronize
             // overhead, so the timer does not know the number of repetitions.
-            // get_total_time() and compute_average_time() have the same result
-            // but in different type. We use compute_average_time to eliminate
-            // the type-casting here.
             auto generate_time =
-                generate_timer->compute_average_time() / FLAGS_repetitions;
+                generate_timer->get_total_time() / FLAGS_repetitions;
             add_or_set_member(this_precond_data["generate"], "time",
                               generate_time, allocator);
 
@@ -188,11 +185,7 @@ void run_preconditioner(const char *precond_name,
 
             // the timer is out of the loops to reduce calling synchronize
             // overhead, so the timer does not know the number of repetitions.
-            // get_total_time() and compute_average_time() have the same result
-            // but in different type. We use compute_average_time to eliminate
-            // the type-casting here.
-            auto apply_time =
-                apply_timer->compute_average_time() / FLAGS_repetitions;
+            auto apply_time = apply_timer->get_total_time() / FLAGS_repetitions;
             add_or_set_member(this_precond_data["apply"], "time", apply_time,
                               allocator);
         }

benchmark/utils/chrono_utils.hpp

@@ -0,0 +1,62 @@
+/*******************************<GINKGO LICENSE>******************************
+Copyright (c) 2017-2020, the Ginkgo authors
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+******************************<GINKGO LICENSE>*******************************/
+
+#ifndef GKO_BENCHMARK_UTILS_CHRONO_UTILS_HPP_
+#define GKO_BENCHMARK_UTILS_CHRONO_UTILS_HPP_
+
+
+#include <chrono>
+
+
+namespace {
+
+
+/**
+ * Get the seconds of duration in double precision.
+ *
+ * @param duration  the chrono::steady_clock::duration
+ *
+ * @return the seconds of duration in double precision.
+ */
+double get_duration_in_seconds(std::chrono::steady_clock::duration time)
+{
+    auto counts =
+        std::chrono::duration_cast<std::chrono::nanoseconds>(time).count();
+    constexpr int sec_in_ns = 1e9;
+    return static_cast<double>(counts) / sec_in_ns;
+}
+
+
+}  // namespace
+
+
+#endif  // GKO_BENCHMARK_UTILS_CHRONO_UTILS_HPP_

benchmark/utils/loggers.hpp

@@ -43,6 +43,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <unordered_map>
 
 
+#include "benchmark/utils/chrono_utils.hpp"
 #include "benchmark/utils/general.hpp"
 
 
@@ -109,11 +110,7 @@ struct OperationLogger : gko::log::Logger {
         for (const auto &entry : total) {
             add_or_set_member(
                 object, entry.first.c_str(),
-                std::chrono::duration_cast<std::chrono::nanoseconds>(
-                    entry.second)
-                        .count() /
-                    repetitions,
-                alloc);
+                get_duration_in_seconds(entry.second) / repetitions, alloc);
         }
     }
 
@@ -208,9 +205,7 @@ struct ResidualLogger : gko::log::Logger {
                                const gko::LinOp *residual_norm) const override
     {
         timestamps.PushBack(
-            std::chrono::duration_cast<std::chrono::nanoseconds>(
-                std::chrono::steady_clock::now() - start)
-                .count(),
+            get_duration_in_seconds(std::chrono::steady_clock::now() - start),
             alloc);
         if (residual_norm) {
             rec_res_norms.PushBack(

benchmark/utils/timer.hpp

@@ -40,6 +40,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <gflags/gflags.h>
 
 
+#include "benchmark/utils/chrono_utils.hpp"
+
+
 #ifdef HAS_CUDA
 
 
@@ -98,47 +101,46 @@ class Timer {
     }
 
     /**
-     * Get the summation of each time in nanoseconds.
+     * Get the summation of each time in seconds.
      *
-     * @return the nanoseconds of total time
+     * @return the seconds of total time
      */
-    std::int64_t get_total_time() const { return total_duration_ns_; }
+    double get_total_time() const { return total_duration_sec_; }
 
     /**
      * Get the number of repetitions.
      *
      * @return the number of repetitions
      */
-    std::int64_t get_num_repetitions() const { return duration_ns_.size(); }
+    std::int64_t get_num_repetitions() const { return duration_sec_.size(); }
 
     /**
-     * Compute the average time of repetitions in nanoseconds
+     * Compute the average time of repetitions in seconds
      *
-     * @return the average time in nanoseconds
+     * @return the average time in seconds
      */
     double compute_average_time() const
     {
-        return static_cast<double>(this->get_total_time()) /
-               this->get_num_repetitions();
+        return this->get_total_time() / this->get_num_repetitions();
     }
 
     /**
-     * Get the vector containing the time of each repetition in nanoseconds.
+     * Get the vector containing the time of each repetition in seconds.
      *
-     * @return the vector of time for each repetition in nanoseconds
+     * @return the vector of time for each repetition in seconds
      */
-    std::vector<std::int64_t> get_time_detail() const { return duration_ns_; }
+    std::vector<double> get_time_detail() const { return duration_sec_; }
 
     /**
-     * Get the latest result in nanoseconds. If there is no result yet, return
+     * Get the latest result in seconds. If there is no result yet, return
      * 0.
      *
-     * @return the latest result in nanoseconds
+     * @return the latest result in seconds
      */
-    std::int64_t get_latest_time() const
+    double get_latest_time() const
     {
-        if (duration_ns_.size() >= 1) {
-            return duration_ns_.back();
+        if (duration_sec_.size() >= 1) {
+            return duration_sec_.back();
         } else {
             return 0;
         }
@@ -149,27 +151,27 @@ class Timer {
      */
     void clear()
     {
-        duration_ns_.clear();
+        duration_sec_.clear();
         tic_called_ = false;
-        total_duration_ns_ = 0;
+        total_duration_sec_ = 0;
     }
 
     /**
      * Create a timer
      */
-    Timer() : tic_called_(false), total_duration_ns_(0) {}
+    Timer() : tic_called_(false), total_duration_sec_(0) {}
 
 protected:
     /**
-     * Put the nanosecond result into vector
+     * Put the second result into vector
      *
-     * @param ns  the nanosecond result to insert
+     * @param ns  the second result to insert
      */
-    void add_record(std::int64_t ns)
+    void add_record(double ns)
     {
         // add the result;
-        duration_ns_.emplace_back(ns);
-        total_duration_ns_ += ns;
+        duration_sec_.emplace_back(ns);
+        total_duration_sec_ += ns;
     }
 
     /**
@@ -178,16 +180,16 @@ class Timer {
     virtual void tic_impl() = 0;
 
     /**
-     * The implementation of toc. Return the nanoseconds result.
+     * The implementation of toc. Return the seconds result.
      *
-     * @return the nanoseconds result
+     * @return the seconds result
      */
-    virtual std::int64_t toc_impl() = 0;
+    virtual double toc_impl() = 0;
 
 private:
-    std::vector<std::int64_t> duration_ns_;
+    std::vector<double> duration_sec_;
     bool tic_called_;
-    std::int64_t total_duration_ns_;
+    double total_duration_sec_;
 };
 
 
@@ -212,13 +214,11 @@ class CpuTimer : public Timer {
         start_ = std::chrono::steady_clock::now();
     }
 
-    std::int64_t toc_impl() override
+    double toc_impl() override
     {
         exec_->synchronize();
         auto stop = std::chrono::steady_clock::now();
-        auto duration_time =
-            std::chrono::duration_cast<std::chrono::nanoseconds>(stop - start_)
-                .count();
+        auto duration_time = get_duration_in_seconds(stop - start_);
         return duration_time;
     }
 
@@ -268,7 +268,7 @@ class CudaTimer : public Timer {
         GKO_ASSERT_NO_CUDA_ERRORS(cudaEventRecord(start_));
     }
 
-    std::int64_t toc_impl() override
+    double toc_impl() override
     {
         gko::cuda::device_guard g{id_};
         // Currently, gko::CudaExecutor always use default stream.
@@ -279,7 +279,8 @@ class CudaTimer : public Timer {
         // resolution of around 0.5 microseconds
         GKO_ASSERT_NO_CUDA_ERRORS(
             cudaEventElapsedTime(&duration_time, start_, stop_));
-        return static_cast<std::int64_t>(duration_time * 1e6);
+        constexpr int sec_in_ms = 1e3;
+        return static_cast<double>(duration_time) / sec_in_ms);
     }
 
 private:
@@ -333,7 +334,7 @@ class HipTimer : public Timer {
         GKO_ASSERT_NO_HIP_ERRORS(hipEventRecord(start_));
     }
 
-    std::int64_t toc_impl() override
+    double toc_impl() override
     {
         gko::hip::device_guard g{id_};
         // Currently, gko::HipExecutor always use default stream.
@@ -344,7 +345,8 @@ class HipTimer : public Timer {
         // resolution of around 0.5 microseconds
         GKO_ASSERT_NO_HIP_ERRORS(
             hipEventElapsedTime(&duration_time, start_, stop_));
-        return static_cast<std::int64_t>(duration_time * 1e6);
+        constexpr int sec_in_ms = 1e3;
+        return static_cast<double>(duration_time) / sec_in_ms;
     }
 
 private: