lkml.org 
[lkml]   [2005]   [Oct]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: Robust Futexes status
    Date

    On Oct 23, 2005, at 8:48 PM, Sven-Thorsten Dietrich wrote:

    > On Sun, 2005-10-23 at 13:52 -0700, david singleton wrote:
    >> Inaky Perez-Gonzalez has a wonderful suite of performance, stress
    >> and
    >> functionality tests for the fusyn pthreads mutex package.
    >
    >> The graphs are just to show relative performance for the different
    >> flavor kernels. The
    >> kernel's perform quite closely regardless of the 'flavor' of kernel.
    >> The kernels have quite a few
    >> debugging options turned so I can look for any problems so performance
    >> is not optimal.
    >>
    >
    > The Mutex ownership change seems to climb with waiting threads.
    >
    > Its hard to tell with the log-n X-axis scale, but does this possibly
    > correlate to the deadlock-detect option?

    It could be. I have been running all the tests mainly as stress and
    functionality tests.
    >
    > If Deadlock-detect is enabled we should be seeing a graph proportional
    > to n-squared on a linear X axis.
    >
    > If deadlock detect is disabled, the wait time should plateau for very
    > large N.

    The original run script ran up to 7500 waiting threads. I ran a version
    that only went up to 400 threads.

    When I get full performance data I'll post it.

    David
    >
    > Sven
    >
    >
    >> It appears the robust futex functionality is healthy in all flavors
    >> of
    >> kernel.
    >>
    >>
    >>
    >> David
    >>
    >>
    >>
    >>
    > --
    > ***********************************
    > Sven-Thorsten Dietrich
    > Real-Time Software Architect
    > MontaVista Software, Inc.
    > 1237 East Arques Ave.
    > Sunnyvale, CA 94085
    >
    > Phone: 408.992.4515
    > Fax: 408.328.9204
    >
    > http://www.mvista.com
    > Platform To Innovate
    > ***********************************
    >

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-10-24 19:05    [W:0.023 / U:61.364 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site