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

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Date:	Tue, 27 Feb 2007 11:16:11 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: threadlets as 'naive pool of threads', epoll, some measurements

On Mon, Feb 26, 2007 at 09:23:38PM +0100, Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> 
> > > no. Please read the evserver_threadlet.c code. There's no kevent in 
> > > there. There's no epoll() in there. All that you can see there is 
> > > the natural behavior of pure threadlets. And it's not a workload /I/ 
> > > picked for threadlets - it is a workload, filesize, parallelism 
> > > level and request handling function /you/ picked for 
> > > "event-servers".
> > 
> > I know that there is no kevents there, that would be really strange if 
> > you would test it in your environment after all that empty kevent 
> > releases.
> 
> i havent got around figuring out the last v2.6.20 based kevent release, 
> and your git tree is v2.6.21-rc1 based. Do you have some easy URL for me 
> to fetch the last v2.6.20 kevent release?

I use kevent-36 release patches on top of 2.6.20 tree.
There are some syscall numbers overlap with thrteadlet patches, but
rejectsa re trivial.

> > Enough, you say micro-thread design is superior - ok, that is your 
> > point.
> 
> note that threadlets are not 'micro-threads'. A threadlet is more of an 
> 'optional thread' (as i mentioned it earlier): whenever it does anything 
> that makes it distinct from a plain function call, it's converted into a 
> separate thread by the kernel. Otherwise it behaves like a plain 
> function call and returns.

I know.
But it is rare case for the most situations, when things do not block,
so I called it micro-thread, since it spawns a new thread (get from
preallocated pool) for parallel processing.

> 	Ingo

-- 
	Evgeniy Polyakov
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