Re: [Gems-users] logTransactionStore

["Derek Hower" <drh5@xxxxxxxxxxx>]

Ruby will replay an instruction only once (ignoring for now
transactional rollback and replay).  Ruby initially stalls an
instruction indefinitely because at the time the instruction issues,
Ruby doesn't know how long the instruction will take.  After Ruby does
timing calculations, it will explicitly unstall the instruction when
the instruction is supposed to commit.

For transactional memory, Ruby follows the same model until a
transaction needs to abort.  At that time, the Simics state is rolled
back from the log using standard Simics API calls, and then Ruby
continues as normal to replay the transaction.

-Derek

On Thu, Oct 9, 2008 at 5:38 AM, Lois Orosa Nogueira <lois.orosa@xxxxxx> wrote:
> Thanks Jayaram,
>
> I have other question. In
> https://lists.cs.wisc.edu/archive/gems-users/2007-May/msg00015.shtml  Mike
> Marty said:
>
> The model is that Ruby will stall a Simics processor indefinitely until a
> request finishes.  Then it unstalls Simics and Simics will "replay" the
> stalled instruction
>
> How many times replay simics the stalled instruction? Does it depends on the
> instruction? Can anybody explain a little more that happeds in this replays
> of the instructions??
>
> In a ST_XACT, when the addUndoLogEntry is called (in the replay??)?
>
>
> Thanks in advance
> Lois
>
> Jayaram Bobba escribió:
>
> logTransactionStore is not used. search for addUndoLogEntry in
> TransactionSimicsProcessor.C instead...
>
> Jayaram
>
> Lois Orosa Nogueira wrote:
>
>
> Hi list,
>
> in log_tm, where it is done the log transaction store ??
>
>  I don't see where the function
> TransactionInterfaceManager::logTransactionStore is called when there is
> a ST_XACT
>
> Thanks
> Lois
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