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    SubjectRe: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3
    On Fri, 23 Feb 2007, Evgeniy Polyakov wrote:

    > On Thu, Feb 22, 2007 at 11:46:48AM -0800, Davide Libenzi (davidel@xmailserver.org) wrote:
    > >
    > > A dynamic pool will smooth thread creation/freeing up by a lot.
    > > And, in my box a *pthread* create/free takes ~10us, at 1000/s is 10ms, 1%.
    > > Bad, but not so aweful ;)
    > > Look, I'm *definitely* not trying to advocate the use of async syscalls for
    > > network here, just pointing out that when we're talking about threads,
    > > Linux does a pretty good job.
    >
    > If we are going to create 1000 threads each second, then it is better to
    > preallocate them and queue a work to that pool - like syslets did with
    > syscalls, but not ulitimately create a new thread just because it is not
    > that slow.

    We do create a pool indeed, as I said in the opening of my asnwer. The
    numbers I posted was just to show that thread creation/destroy is pretty
    fast, but that does not justify it as a design choice.



    > All such micro-thread designs are especially good in the case when
    > 1. switching is _rare_ (very)
    > 2. programmer does not want to create complex model to achieve maximum
    > performance
    >
    > Disk (cached) IO definitely hits first entry and second one is there for
    > advertisements and fast deployment, but overall usage of the
    > asynchronous IO model is not limited to the above scenario, so
    > micro-threads definitely hit own niche, but they can not cover all usage
    > cases.

    You know, I read this a few times, but I still don't get what your point
    is here ;) Are you talking about micro-thread design in the kernel as for
    kthreads usage for AIO, or about userspace?



    - Davide


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