Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

Evgeniy Polyakov
2007-02-26T16:48:44Z

On Mon, Feb 26, 2007 at 01:51:23PM +0100, Ingo Molnar (mingo@elte.hu) wrote:
>
> * Evgeniy Polyakov <johnpol@2ka.mipt.ru> wrote:
>
> > Even having main dispatcher as epoll/kevent loop, the _whole_
> > threadlet model is absolutely micro-thread in nature and not state
> > machine/event.
>
> Evgeniy, i'm not sure how many different ways to tell this to you, but
> you are not listening, you are not learning and you are still not
> getting it at all.
>
> The scheduler /IS/ a generic work/event queue. And it's pretty damn
> fast. No amount of badmouthing will change that basic fact. Not exactly
> as fast as a special-purpose queueing system (for all the reasons i
> outlined to you, and which you ignored), but it gets pretty damn close
> even for the web workload /you/ identified, and offers a user-space
> programming model that is about 1000 times more useful than
> state-machines.

Meanwhile on practiceal side:
via epia kevent/epoll/threadlet:

client: ab -c500 -n5000 $url

kevent: 849.72
epoll: 538.16
threadlet:
gcc ./evserver_epoll_threadlet.c -o ./evserver_epoll_threadlet
In file included from ./evserver_epoll_threadlet.c:30:
./threadlet.h: In function ‘threadlet_exec’:
./threadlet.h:46: error: can't find a register in class ‘GENERAL_REGS’
while reloading ‘asm’

That particular asm optimization fails to compile.

> Ingo

--
Evgeniy Polyakov