Re: Why is java consumer/producer so much faster than C++
In article <86c79114-84e6-4065-a9a4-b5b3edf8fcac@googlegroups.com>,
Howard Hinnant <howard.hinnant@gmail.com> wrote:
I made a few changes to your code:
1. I only signal if the capacity becomes non-zero or non-full.
2. If the queue is the queue has got some items in it and the mutex is locked, the put thread yields to the take
thread. If the queue has some free space in it and the mutex is locked, the take thread yields to the put
thread.
Are you sure about the usefulness of #2?
Doing a few tests myself, adding this in m queue seems to reduce performance by some 20%:
while (!lock.owns_lock())
{
if (queue_.size() > capacity_/4)
{
for (int i = 0; i < 3250; ++i)
std::this_thread::yield();
lock.try_lock();
}
else
{
lock.lock();
break;
}
}
3. Traffic in int instead of unique_ptr<int>.
Yannick
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