Article: Haswell TM Alternatives

Article: Haswell Transactional Memory Alternatives
By: Doug S (foo.delete@this.bar.bar), August 24, 2012 8:34 am
Room: Moderated Discussions
Linus Torvalds (torvalds.delete@this.linux-foundation.org) on August 22, 2012 10:16 am wrote:
> This is
> one of the reasons why I was arguing so strongly at one point (both here and to
> some Intel engineers) for the transaction model to use "success prediction"
> (possibly actually re-using the branch prediction hardware, but possibly with a
> separate predictor). Because part of "really cheap failure modes" is to not even
> bother trying if it's unlikely to work.


Wouldn't you want a combination of both hardware and software as the ideal? Same thing as the hints to branch prediction used in Linux - "if (unlikely(condition)) ..." There will be some transactions with little contention you feel would almost never fail, and vice versa.
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TopicPosted ByDate
Article: Haswell TM AlternativesDavid Kanter08/21/12 09:17 PM
  Article: Haswell TM AlternativesHÃ¥kan Winbom08/21/12 11:52 PM
    Article: Haswell TM AlternativesDavid Kanter08/22/12 01:06 AM
  Article: Haswell TM Alternativesanon08/22/12 08:46 AM
    Article: Haswell TM AlternativesLinus Torvalds08/22/12 09:16 AM
      Article: Haswell TM AlternativesDoug S08/24/12 08:34 AM
    AMD's ASF even more limitedPaul A. Clayton08/22/12 09:20 AM
      AMD's ASF even more limitedLinus Torvalds08/22/12 09:41 AM
        Compiler use of ll/sc?Paul A. Clayton08/28/12 09:28 AM
          Compiler use of ll/sc?Linus Torvalds09/08/12 12:58 PM
            Lock recognition?Paul A. Clayton09/10/12 01:17 PM
              Sorry, I was confusedPaul A. Clayton09/13/12 10:56 AM
  Filter to detect store conflictsPaul A. Clayton08/22/12 09:19 AM
  Article: Haswell TM Alternativesbakaneko08/22/12 02:02 PM
    Article: Haswell TM AlternativesDavid Kanter08/22/12 02:45 PM
      Article: Haswell TM Alternativesbakaneko08/22/12 09:56 PM
  Cache line granularity?Paul A. Clayton08/28/12 09:28 AM
    Cache line granularity?David Kanter08/31/12 08:13 AM
      A looser definition might have advantagesPaul A. Clayton09/01/12 06:29 AM
    Cache line granularity?rwessel08/31/12 07:54 PM
      Alpha load locked granularityPaul A. Clayton09/01/12 06:29 AM
        Alpha load locked granularityanon09/02/12 05:23 PM
          Alpha pages groupsPaul A. Clayton09/03/12 04:16 AM
  An alternative implementationMaynard Handley11/20/12 09:52 PM
    An alternative implementationbakaneko11/21/12 05:52 AM
      Guarding unread values?Paul A. Clayton11/21/12 08:39 AM
        Guarding unread values?bakaneko11/21/12 11:25 AM
    TM granularity and versioningPaul A. Clayton11/21/12 08:27 AM
      TM granularity and versioningMaynard Handley11/21/12 10:52 AM
        Indeed, TM (and coherence) has devilish details (NT)Paul A. Clayton11/21/12 10:56 AM
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