Re: [boost] [Fibers] Performance

Subject: Re: [boost] [Fibers] Performance
From: Oliver Kowalke (oliver.kowalke_at_[hidden])
Date: 2014-01-14 06:41:31

2014/1/14 Antony Polukhin <antoshkka_at_[hidden]>

> Pseudocode:
>
> void foo(){}
> const unsigned N = 1000;
>
> // Test #1
> timer start
> for (unsigned i = 0; i < N; ++i) {
>     fiber f(&foo);
>     f.join();
> }
>
> cout << "Fibers: " << timer stop;
>
>
> timer start
> for (unsigned i = 0; i < N; ++i) {
>     boost::thread f(&foo);
>     f.join();
> }
>
> cout << "Threads: " << timer stop;
>
> // Test #2
> timer start
> for (unsigned i = 0; i < N; ++i) {
>     fiber f1(&foo), f2(&foo), f3(&foo), f4(&foo), f5(&foo);
>     f1.join(); f2.join(); f3.join(); f4.join(); f5.join();
> }
>
> cout << "Fibers: " << timer stop;
>
> timer start
> for (unsigned i = 0; i < N; ++i) {
>     boost::thread f1(&foo), f2(&foo), f3(&foo), f4(&foo), f5(&foo);
>     f1.join(); f2.join(); f3.join(); f4.join(); f5.join();
> }
>
> cout << "Threads:  " << timer stop;
>
> // Test #3
> timer start
> for (unsigned i = 0; i < N; ++i) {
>     fiber(&foo).detach();
> }
>
> cout << "Fibers: " << timer stop;
>
> timer start
> for (unsigned i = 0; i < N; ++i) {
>     boost::thread(&foo).detach();
> }
>
> cout << "Threads:  " << timer stop;
>

I did a quick hack and the code using fibers is 2-3 times faster than the
threads.
boost.fiber does not contain the suggested optimizations (like replacing
stl containers)