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cpp-taskflow/example/threadpool.cpp at master · jhonconal/cpp-taskflow · GitHub
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//
2018/8/31 contributed by Guannan
//
//
Examples to test different threadpool implementations:
//
- SimpleThreadpool
//
- ProactiveThreadpool
#
include
<
taskflow/threadpool/threadpool.hpp
>
#
include
<
chrono
>
#
include
<
random
>
//
Procedure: benchmark_empty_jobs
void
benchmark_empty_jobs
() {
std::cout <<
"
Benchmarking threadpool throughput on empty jobs ...
\n
"
;
unsigned
thread_num =
4
;
unsigned
int
task_num =
10000000
;
auto
start =
std::chrono::high_resolution_clock::now
();
tf::ProactiveThreadpool
proactive
(thread_num);
for
(
size_t
i=
0
; i<task_num; i++){
proactive.
silent_async
([](){});
}
proactive.
shutdown
();
auto
end =
std::chrono::high_resolution_clock::now
();
auto
elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
std::cout <<
"
ProactiveThreadpool elapsed time:
"
<< elapsed.
count
() <<
"
ms
\n
"
;
start =
std::chrono::high_resolution_clock::now
();
tf::SimpleThreadpool
simple
(thread_num);
for
(
size_t
i=
0
; i<task_num; i++){
simple.
silent_async
([](){});
}
simple.
shutdown
();
end =
std::chrono::high_resolution_clock::now
();
elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
std::cout <<
"
SimpleThreadpool elapsed time:
"
<< elapsed.
count
() <<
"
ms
\n
"
;
}
//
Procedure: benchmark_atomic_add
void
benchmark_atomic_add
() {
std::cout <<
"
Benchmarking threadpool throughput on atomic add ...
\n
"
;
unsigned
thread_num =
4
;
unsigned
int
task_num =
10000000
;
std::atomic<
int
>
counter
(
0
);
auto
start =
std::chrono::high_resolution_clock::now
();
tf::ProactiveThreadpool
proactive
(thread_num);
for
(
size_t
i=
0
; i<task_num; i++){
proactive.
silent_async
([&counter](){ counter++; });
}
proactive.
shutdown
();
auto
end =
std::chrono::high_resolution_clock::now
();
auto
elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
std::cout <<
"
ProactiveThreadpool elapsed time:
"
<< elapsed.
count
() <<
"
ms
\n
"
;
counter =
0
;
start =
std::chrono::high_resolution_clock::now
();
tf::SimpleThreadpool
simple
(thread_num);
for
(
size_t
i=
0
; i<task_num; i++){
simple.
silent_async
([&counter](){ counter++; });
}
simple.
shutdown
();
end =
std::chrono::high_resolution_clock::now
();
elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
std::cout <<
"
SimpleThreadpool elapsed time:
"
<< elapsed.
count
() <<
"
ms
\n
"
;
}
//
Function: main
int
main
(
int
argc,
char
* argv[]) {
benchmark_empty_jobs
();
benchmark_atomic_add
();
return
0
;
}
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