CPU Usage is around 30% for cpp rest sdk Listener

[poojakuntal]

Hi All,

I wrote a http listener using cpprestsdk 2.9

class Listener
{
public:
    Listener() {}
    Listener(utility::string_t url);

    pplx::task<void> open() { return m_listener.open(); }
    pplx::task<void> close() { return m_listener.close(); }

private:
    void handle_get_or_post(http_request message);

    http_listener m_listener;
};

Listener::Listener(utility::string_t url) : m_listener(url)
{
    m_listener.support(methods::GET, std::bind(&Listener::handle_get_or_post, this, std::placeholders::_1));
    m_listener.support(methods::POST, std::bind(&Listener::handle_get_or_post, this, std::placeholders::_1));
}

void Listener::handle_get_or_post(http_request message)
{
    message.reply(status_codes::OK, "ACCEPTED");
};

And when i run this program, cpu usage for this listerner is around 30%

How it can be minimized? Why cpu usage is so high for cpprestsdk?

Regards,
Pooja

[ras0219-msft]

The CPU usage for the snippet you've posted should be 0% when messages are not being received. Obviously, CPU will be used when receiving requests, however I don't know if 30% is "high" for the volume that you're receiving.

However, depending on how you've chosen to implement your main function, you could be performing a spinning wait or worse (for example, are you doing while(1){} after calling l.open().wait()?).

I recommend profiling your application to discover where the CPU is being consumed. See https://msdn.microsoft.com/en-us/library/ms182372.aspx.