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Re: Single Thread Performance

Message-ID <4F392235.1020804@SPAM.comp-arch.net> (permalink)
Date 2012-02-13 06:46 -0800
From "Andy (Super) Glew" <andy@SPAM.comp-arch.net>
Organization comp-arch.net
Newsgroups comp.arch
Subject Re: Single Thread Performance
References (4 earlier) <jh3veo$ojd$1@adenine.netfront.net> <18985540.1742.1328921030856.JavaMail.geo-discussion-forums@yqks7> <jwvk43r259i.fsf-monnier+comp.arch@gnu.org> <4F38875A.2050407@SPAM.comp-arch.net> <12562993.824.1329107776365.JavaMail.geo-discussion-forums@ynnj2>

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On 2/12/2012 8:36 PM, MitchAlsup wrote:
> On Sunday, February 12, 2012 9:45:30 PM UTC-6, Andy (Super) Glew wrote:
>
>> What would a scalable implementation of hardware TM look like?  Well, it
>> can't depend on finite size caches, except as an accelerator.
>
> May I suggest that scalability is going to require that the Software gain some understanding of the amounts and kinds of interference and then have the SW do something proactive about it.
>
> My original ASF had this feature, the current one does not.
>
> Mitch


What does that look like?

Beyond what Intel TM already does: provide a way for the transaction to 
fail, and for SW to resort to some other algorithm, probably lock based.

The proactive part would be for SW to say "Hey, it doesn't look as if 
this transaction will ever pass as a transaction - because it uses too 
much data, and/or because there are hot spots - so I won't bother ever 
to use a HW transaction for it."   Possibly with profiling feedback, 
e.g. EMON profiling feedback, so that SW can learn even when it can't 
predict statically.

What more do you want?

--

By the way, lots of people jump on the fact that Intel's current HW TM 
has no transactional escape - no way to do memory accesses from INSIDE 
the transaction that go outside the transaction.  E.g. no way to call 
malloc() from inside a transaction without aborting (because malloc 
often updates shared pointers).  (Yes, I know:  you can code mallocs so 
that they only update shared stuff if private pools are exhausted.)

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Single Thread Performance "Unspecified" <partha@perfectvips.com> - 2012-02-04 21:54 +0530
  Re: Single Thread Performance Brett Davis <ggtgp@yahoo.com> - 2012-02-06 05:55 -0600
    Re: Single Thread Performance nmm1@cam.ac.uk - 2012-02-06 13:06 +0000
      Re: Single Thread Performance Robert Myers <rbmyersusa@gmail.com> - 2012-02-06 14:12 -0500
        Re: Single Thread Performance BGB <cr88192@hotmail.com> - 2012-02-06 13:36 -0700
          Re: Single Thread Performance nmm1@cam.ac.uk - 2012-02-06 20:47 +0000
            Re: Single Thread Performance BGB <cr88192@hotmail.com> - 2012-02-06 15:07 -0700
              Re: Single Thread Performance Brett Davis <ggtgp@yahoo.com> - 2012-02-06 16:32 -0600
                Re: Single Thread Performance Robert Wessel <robertwessel2@yahoo.com> - 2012-02-06 17:45 -0600
                Re: Single Thread Performance Brett Davis <ggtgp@yahoo.com> - 2012-02-07 06:01 -0600
                Re: Single Thread Performance BGB <cr88192@hotmail.com> - 2012-02-07 13:32 -0700
                Re: Single Thread Performance timcaffrey@aol.com (Tim McCaffrey) - 2012-02-09 19:08 +0000
                Re: Single Thread Performance BGB <cr88192@hotmail.com> - 2012-02-10 08:56 -0700
        Re: Single Thread Performance nmm1@cam.ac.uk - 2012-02-06 20:42 +0000
          Re: Single Thread Performance Robert Myers <rbmyersusa@gmail.com> - 2012-02-06 19:36 -0500
          Re: Single Thread Performance "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-02-06 18:28 -0800
            Re: Single Thread Performance Robert Myers <rbmyersusa@gmail.com> - 2012-02-06 22:23 -0500
            Re: Single Thread Performance nmm1@cam.ac.uk - 2012-02-07 06:52 +0000
        Re: Single Thread Performance MitchAlsup <MitchAlsup@aol.com> - 2012-02-06 12:10 -0800
          Re: Single Thread Performance Thomas Womack <twomack@chiark.greenend.org.uk> - 2012-02-07 10:13 +0000
            Re: Single Thread Performance Brett Davis <ggtgp@yahoo.com> - 2012-02-20 23:58 -0600
          Re: Single Thread Performance timcaffrey@aol.com (Tim McCaffrey) - 2012-02-07 17:33 +0000
            Re: Single Thread Performance nedbrek <nedbrek@yahoo.com> - 2012-02-15 08:10 -0500
    Re: Single Thread Performance Robert Myers <rbmyersusa@gmail.com> - 2012-02-06 14:17 -0500
      Re: Single Thread Performance del cecchi <delcecchi@gmail.com> - 2012-02-25 22:07 -0800
    Re: Single Thread Performance jgk@panix.com (Joe keane) - 2012-02-07 17:57 +0000
  Re: Single Thread Performance Quadibloc <jsavard@ecn.ab.ca> - 2012-02-05 13:13 -0800
  Re: Single Thread Performance MitchAlsup <MitchAlsup@aol.com> - 2012-02-05 21:35 -0800
    Re: Single Thread Performance timcaffrey@aol.com (Tim McCaffrey) - 2012-02-07 17:38 +0000
      Re: Single Thread Performance Stephen Sprunk <stephen@sprunk.org> - 2012-02-07 14:54 -0600
        Re: Single Thread Performance timcaffrey@aol.com (Tim McCaffrey) - 2012-02-07 21:33 +0000
          Re: Single Thread Performance Stephen Sprunk <stephen@sprunk.org> - 2012-02-07 23:13 -0600
            Re: Single Thread Performance timcaffrey@aol.com (Tim McCaffrey) - 2012-02-08 18:54 +0000
              Re: Single Thread Performance Stephen Sprunk <stephen@sprunk.org> - 2012-02-08 15:17 -0600
                Re: Single Thread Performance Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-02-09 08:13 +0100
                Re: Single Thread Performance timcaffrey@aol.com (Tim McCaffrey) - 2012-02-09 17:08 +0000
                Re: Single Thread Performance Stephen Sprunk <stephen@sprunk.org> - 2012-02-09 16:01 -0600
              Re: Single Thread Performance Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-02-09 07:56 +0100
                Re: Single Thread Performance timcaffrey@aol.com (Tim McCaffrey) - 2012-02-09 17:18 +0000
          Re: Single Thread Performance Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-02-08 10:17 +0100
        Re: Single Thread Performance Jon <jon@beniston.com> - 2012-02-08 05:32 -0800
      Re: Single Thread Performance MitchAlsup <MitchAlsup@aol.com> - 2012-02-07 16:00 -0800
        Re: Single Thread Performance timcaffrey@aol.com (Tim McCaffrey) - 2012-02-08 18:35 +0000
    Re: Single Thread Performance Partha <parthaspanda22@gmail.com> - 2012-02-10 11:32 -0800
      Re: Single Thread Performance nmm1@cam.ac.uk - 2012-02-10 20:31 +0000
        Re: Single Thread Performance "Unspecified" <partha@perfectvips.com> - 2012-02-11 02:12 +0530
          Re: Single Thread Performance nmm1@cam.ac.uk - 2012-02-10 21:04 +0000
          Re: Single Thread Performance MitchAlsup <MitchAlsup@aol.com> - 2012-02-10 16:43 -0800
            Re: Single Thread Performance "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-02-10 19:48 -0800
              Re: Single Thread Performance EricP <ThatWouldBeTelling@thevillage.com> - 2012-02-12 14:31 -0500
            Re: Single Thread Performance Stefan Monnier <monnier@iro.umontreal.ca> - 2012-02-12 21:50 -0500
              Re: Single Thread Performance "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-02-12 19:45 -0800
                Re: Single Thread Performance MitchAlsup <MitchAlsup@aol.com> - 2012-02-12 20:36 -0800
                Re: Single Thread Performance "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-02-13 06:46 -0800
                Re: Single Thread Performance MitchAlsup <MitchAlsup@aol.com> - 2012-02-13 08:58 -0800
                Re: Single Thread Performance "Paul A. Clayton" <paaronclayton@gmail.com> - 2012-02-13 16:19 -0800
                Re: Single Thread Performance Rick Jones <rick.jones2@hp.com> - 2012-02-14 03:55 +0000
                Re: Single Thread Performance Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-02-14 10:30 +0100
                Re: Single Thread Performance Andrew Reilly <areilly---@bigpond.net.au> - 2012-02-14 10:49 +0000
                Re: Single Thread Performance Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-02-14 13:21 +0100
                Re: Single Thread Performance Stephen Fuld <SFuld@alumni.cmu.edu.invalid> - 2012-02-14 13:11 -0800
                Re: Single Thread Performance MitchAlsup <MitchAlsup@aol.com> - 2012-02-14 09:29 -0800
                Re: Single Thread Performance EricP <ThatWouldBeTelling@thevillage.com> - 2012-02-14 12:40 -0500
                Re: Single Thread Performance EricP <ThatWouldBeTelling@thevillage.com> - 2012-02-14 16:12 -0500
                Re: Single Thread Performance Rick Jones <rick.jones2@hp.com> - 2012-02-14 21:14 +0000
                Re: Single Thread Performance Rick Jones <rick.jones2@hp.com> - 2012-02-14 21:16 +0000
                Re: Single Thread Performance Rick Jones <rick.jones2@hp.com> - 2012-02-14 21:09 +0000
                Re: Single Thread Performance MitchAlsup <MitchAlsup@aol.com> - 2012-02-14 09:26 -0800
                Re: Single Thread Performance Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-02-15 08:44 +0100
                Re: Single Thread Performance "Andy (Super) Glew" <andy@SPAM.comp-arch.net> - 2012-02-15 01:07 -0800
                Re: Single Thread Performance Terje Mathisen <"terje.mathisen at tmsw.no"> - 2012-02-14 10:16 +0100
  Re: Single Thread Performance Michael S <already5chosen@yahoo.com> - 2012-02-08 01:04 -0800

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