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time_limit.cc
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time_limit.cc
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// Copyright 2010-2018 Google LLC
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "ortools/util/time_limit.h"
#include "absl/strings/str_cat.h"
DEFINE_bool(time_limit_use_usertime, false,
"If true, rely on the user time in the TimeLimit class. This is "
"only recommended for benchmarking on a non-isolated environment.");
DEFINE_bool(time_limit_use_instruction_count, false,
"If true, measures the number of instructions executed");
namespace operations_research {
// static constants.
const double TimeLimit::kSafetyBufferSeconds = 1e-4;
const int TimeLimit::kHistorySize = 100;
std::string TimeLimit::DebugString() const {
std::string buffer = absl::StrCat(
"Time left: ", (GetTimeLeft()),
"\nDeterministic time left: ", (GetDeterministicTimeLeft()),
"\nElapsed time: ", (GetElapsedTime()),
"\nElapsed deterministic time: ", (GetElapsedDeterministicTime()));
#ifndef NDEBUG
for (const auto& counter : deterministic_counters_) {
const std::string& counter_name = counter.first;
const double counter_value = counter.second;
absl::StrAppend(&buffer, "\n", counter_name, ": ", (counter_value));
}
#endif
return buffer;
}
NestedTimeLimit::NestedTimeLimit(TimeLimit* base_time_limit,
double limit_in_seconds,
double deterministic_limit)
: base_time_limit_(ABSL_DIE_IF_NULL(base_time_limit)),
time_limit_(std::min(base_time_limit_->GetTimeLeft(), limit_in_seconds),
std::min(base_time_limit_->GetDeterministicTimeLeft(),
deterministic_limit)) {
if (base_time_limit_->external_boolean_as_limit_ != nullptr) {
time_limit_.RegisterExternalBooleanAsLimit(
base_time_limit_->external_boolean_as_limit_);
}
}
NestedTimeLimit::~NestedTimeLimit() {
base_time_limit_->AdvanceDeterministicTime(
time_limit_.GetElapsedDeterministicTime());
}
} // namespace operations_research