Re: [Gems-users] results of microbenchmark deque-tm

["Irene-Aggeliki Chounta" <houren@xxxxxxxxxxxxxxxxxx>]

hi Jayaram and thanks for the reply.

 

Would you kindly help me out with some questions I have? forgive my ignorance, I'm new to these all.

 

as you said:

 

> Note that the 'transaction' you see on the screen output refers to a
> workload transaction which is
> different from LogTM transactions.
>

 

to be honest, that's not clear to me at all. In hpca's 2006 paper of transactional memory is stated that: 

"support for the LogTM interface was added using simics magic instructions........To implement the "begin" instruction the memory simulator uses a simics call to create a checkpoint. During a transaction, the memory simulator models the log updates".

 

so when we test a microbenchmark that makes use of BEGIN_TRANSACTION we imply a magic call and then the log updates of LogTM are modeled by the memory system. doesn't this mean that a workload transaction corresponds to a logTM transaction?

And since they are different, how can I watch the LogTM transactions that took place during the execution? (I already tried to print out some stuff from TransactionManager.C and other programs but with no luck...)

 

so, thank you very much for the help.

 

--

Irene,

 

 
> Jayaram
>
> Irene-Aggeliki Chounta wrote:
>> hi everyone,
>> 
>> I'm experimenting with protocol MESI_SMP_LogTM and currently running
>> deque-tm to check out how it works.
>> 
>> I make the needed changes to simics script, copy the binary to
>> simulated machine and execute and then I get in simics host the following:
>> 
>> end_transaction_magic_call: Unexpected magic call number 4
>> end_transaction_magic_call: transaction started: 0, transaction
>> completed: 0, transaction_limit: 4, None
>> [cpu2] v:0x0000000000010f58 p:0x00000003f95b4f58  magic (sethi
>> 0x40000, %g0)
>> simics>
>> 
>> so from what i can understand there's no transaction started due to
>> this unexpected magic call number 4, is that correct????
>> 
>> why is this happening anyway????
>> 
>> thanks in advance.
>> 
>> ps. happy new year all ;)
>> 
>> 
>> -------------------------------------------------------------------
>> irene
>> ......in accordance with the prophecy.
>> ------------------------------------------------------------------------
>>
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