gtsam
3rdparty
Eigen
unsupported
test
cxx11_non_blocking_thread_pool.cpp
Go to the documentation of this file.
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// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2016 Dmitry Vyukov <dvyukov@google.com>
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// Copyright (C) 2016 Benoit Steiner <benoit.steiner.goog@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#define EIGEN_USE_THREADS
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#include "
main.h
"
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#include "Eigen/CXX11/ThreadPool"
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#include "Eigen/CXX11/Tensor"
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static
void
test_create_destroy_empty_pool
()
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{
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// Just create and destroy the pool. This will wind up and tear down worker
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// threads. Ensure there are no issues in that logic.
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for
(
int
i
= 0;
i
< 16; ++
i
) {
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ThreadPool
tp(
i
);
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}
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}
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static
void
test_parallelism
(
bool
allow_spinning)
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{
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// Test we never-ever fail to match available tasks with idle threads.
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const
int
kThreads = 16;
// code below expects that this is a multiple of 4
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ThreadPool
tp(kThreads, allow_spinning);
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VERIFY_IS_EQUAL
(tp.
NumThreads
(), kThreads);
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VERIFY_IS_EQUAL
(tp.
CurrentThreadId
(), -1);
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for
(
int
iter
= 0;
iter
< 100; ++
iter
) {
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std::atomic<int> running(0);
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std::atomic<int> done(0);
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std::atomic<int> phase(0);
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// Schedule kThreads tasks and ensure that they all are running.
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for
(
int
i
= 0;
i
< kThreads; ++
i
) {
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tp.
Schedule
([&]() {
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const
int
thread_id = tp.
CurrentThreadId
();
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VERIFY_GE
(thread_id, 0);
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VERIFY_LE
(thread_id, kThreads - 1);
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running++;
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while
(phase < 1) {
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}
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done++;
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});
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}
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while
(running != kThreads) {
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}
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running = 0;
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phase = 1;
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// Now, while the previous tasks exit, schedule another kThreads tasks and
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// ensure that they are running.
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for
(
int
i
= 0;
i
< kThreads; ++
i
) {
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tp.
Schedule
([&,
i
]() {
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running++;
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while
(phase < 2) {
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}
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// When all tasks are running, half of tasks exit, quarter of tasks
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// continue running and quarter of tasks schedule another 2 tasks each.
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// Concurrently main thread schedules another quarter of tasks.
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// This gives us another kThreads tasks and we ensure that they all
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// are running.
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if
(
i
< kThreads / 2) {
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}
else
if
(
i
< 3 * kThreads / 4) {
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running++;
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while
(phase < 3) {
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}
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done++;
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}
else
{
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for
(
int
j
= 0;
j
< 2; ++
j
) {
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tp.
Schedule
([&]() {
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running++;
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while
(phase < 3) {
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}
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done++;
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});
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}
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}
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done++;
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});
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}
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while
(running != kThreads) {
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}
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running = 0;
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phase = 2;
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for
(
int
i
= 0;
i
< kThreads / 4; ++
i
) {
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tp.
Schedule
([&]() {
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running++;
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while
(phase < 3) {
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}
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done++;
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});
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}
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while
(running != kThreads) {
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}
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phase = 3;
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while
(done != 3 * kThreads) {
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}
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}
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}
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static
void
test_cancel
()
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{
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ThreadPool
tp(2);
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// Schedule a large number of closure that each sleeps for one second. This
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// will keep the thread pool busy for much longer than the default test timeout.
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for
(
int
i
= 0;
i
< 1000; ++
i
) {
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tp.
Schedule
([]() {
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std::this_thread::sleep_for(std::chrono::milliseconds(2000));
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});
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}
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// Cancel the processing of all the closures that are still pending.
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tp.
Cancel
();
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}
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static
void
test_pool_partitions
() {
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const
int
kThreads = 2;
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ThreadPool
tp(kThreads);
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// Assign each thread to its own partition, so that stealing other work only
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// occurs globally when a thread is idle.
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std::vector<std::pair<unsigned, unsigned>> steal_partitions(kThreads);
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for
(
int
i
= 0;
i
< kThreads; ++
i
) {
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steal_partitions[
i
] = std::make_pair(
i
,
i
+ 1);
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}
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tp.
SetStealPartitions
(steal_partitions);
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std::atomic<int> running(0);
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std::atomic<int> done(0);
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std::atomic<int> phase(0);
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// Schedule kThreads tasks and ensure that they all are running.
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for
(
int
i
= 0;
i
< kThreads; ++
i
) {
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tp.
Schedule
([&]() {
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const
int
thread_id = tp.
CurrentThreadId
();
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VERIFY_GE
(thread_id, 0);
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VERIFY_LE
(thread_id, kThreads - 1);
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++running;
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while
(phase < 1) {
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}
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++done;
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});
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}
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while
(running != kThreads) {
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}
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// Schedule each closure to only run on thread 'i' and verify that it does.
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for
(
int
i
= 0;
i
< kThreads; ++
i
) {
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tp.
ScheduleWithHint
(
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[&,
i
]() {
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++running;
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const
int
thread_id = tp.
CurrentThreadId
();
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VERIFY_IS_EQUAL
(thread_id,
i
);
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while
(phase < 2) {
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}
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++done;
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},
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i
,
i
+ 1);
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}
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running = 0;
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phase = 1;
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while
(running != kThreads) {
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}
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running = 0;
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phase = 2;
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}
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EIGEN_DECLARE_TEST
(cxx11_non_blocking_thread_pool)
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{
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CALL_SUBTEST
(
test_create_destroy_empty_pool
());
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CALL_SUBTEST
(
test_parallelism
(
true
));
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CALL_SUBTEST
(
test_parallelism
(
false
));
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CALL_SUBTEST
(
test_cancel
());
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CALL_SUBTEST
(
test_pool_partitions
());
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}
Eigen::ThreadPoolTempl::CurrentThreadId
int CurrentThreadId() const EIGEN_FINAL
Definition:
NonBlockingThreadPool.h:155
VERIFY_LE
#define VERIFY_LE(a, b)
Definition:
main.h:383
Eigen::ThreadPoolTempl::SetStealPartitions
void SetStealPartitions(const std::vector< std::pair< unsigned, unsigned >> &partitions)
Definition:
NonBlockingThreadPool.h:88
VERIFY_GE
#define VERIFY_GE(a, b)
Definition:
main.h:382
VERIFY_IS_EQUAL
#define VERIFY_IS_EQUAL(a, b)
Definition:
main.h:386
test_pool_partitions
static void test_pool_partitions()
Definition:
cxx11_non_blocking_thread_pool.cpp:121
test_cancel
static void test_cancel()
Definition:
cxx11_non_blocking_thread_pool.cpp:105
Eigen::ThreadPoolTempl::ScheduleWithHint
void ScheduleWithHint(std::function< void()> fn, int start, int limit) override
Definition:
NonBlockingThreadPool.h:105
j
std::ptrdiff_t j
Definition:
tut_arithmetic_redux_minmax.cpp:2
Eigen::ThreadPoolTempl::Schedule
void Schedule(std::function< void()> fn) EIGEN_OVERRIDE
Definition:
NonBlockingThreadPool.h:101
test_create_destroy_empty_pool
static void test_create_destroy_empty_pool()
Definition:
cxx11_non_blocking_thread_pool.cpp:16
Eigen::ThreadPoolTempl::NumThreads
int NumThreads() const EIGEN_FINAL
Definition:
NonBlockingThreadPool.h:153
Eigen::ThreadPoolTempl
Definition:
NonBlockingThreadPool.h:16
main.h
iter
iterator iter(handle obj)
Definition:
pytypes.h:2475
test_parallelism
static void test_parallelism(bool allow_spinning)
Definition:
cxx11_non_blocking_thread_pool.cpp:26
Eigen::ThreadPoolTempl::Cancel
void Cancel() EIGEN_OVERRIDE
Definition:
NonBlockingThreadPool.h:138
EIGEN_DECLARE_TEST
EIGEN_DECLARE_TEST(cxx11_non_blocking_thread_pool)
Definition:
cxx11_non_blocking_thread_pool.cpp:173
i
int i
Definition:
BiCGSTAB_step_by_step.cpp:9
CALL_SUBTEST
#define CALL_SUBTEST(FUNC)
Definition:
main.h:399
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Author(s):
autogenerated on Sat Nov 16 2024 04:02:07