Re: threadlets as 'naive pool of threads', epoll, some measurements

[Ingo Molnar <mingo@elte.hu>]

update:

> i have tried the one Evgeniy provided in the URL:
> 
>   http://tservice.net.ru/~s0mbre/archive/kevent/evserver_epoll.c
> 
> and 'ab -k -c8000 -n80000' almost always aborts with:
> 
>   apr_socket_recv: Connection reset by peer (104)
> 
> in the few cases it finishes, i got the following epoll result, over 
> gigabit ethernet, on an UP Athlon64 box:
> 
>    eserver_epoll:     7800 reqs/sec

eserver_epoll.c had a number of bugs. The most serious one was the 
apparently buggy use of "EPOLLET" (edge-triggered events). Removing that 
and moving epoll to level-triggered (which is slower but does not result 
in missed events) gives:

   eserver_epoll:       9400 reqs/sec

> the same with the most naive implementation of the same, using 
> threadlets:
> 
>    eserver_threadlet: 5800 reqs/sec

   eserver_epoll_threadlet:   9400 reqs/sec

as expected, the level of extra blocking triggered by this is low - even 
if the full request function runs without nonblock assumptions.

	Ingo