[mvapich-discuss] problem with timing and _MCST_SUPPORT_ with 1.9a ?

[Evren Yurtesen IB]

Hi Devendar,

Thanks for the patch, I will use it. So defining DISABLE_LOW_LEVEL_TIMERS 
(there was an ifndef in code about this) at any point is a bad idea since 
these timers are absolutely required?

Thanks,
Evren

On Thu, 4 Oct 2012, Devendar Bureddy wrote:

> Hi Evren
>
> We have introduced multicast features only in 1.9a.  The timers are
> required for UD multicast internal flow control.  unfortunately
> --enable-fast do not suppress these warnings.   I have attached a
> small patch to print these warnings only in debug. Please follow below
> instructions to apply the patch
>
> $cd mvapich2-1.9a
> $  patch -p1 < patch.diff
> $ make && make install
>
> -Devendar
>
> On Thu, Oct 4, 2012 at 7:47 AM, Evren Yurtesen IB <eyurtese at abo.fi> wrote:
>> Hello,
>>
>> I am getting timing warnings (due to cpu speed scaling) with 1.9a but NOT
>> with previous versions (<=1.8.1). I configured them all with --enable-fast
>> and exactly same configure options
>>
>> I tracked the issue to:
>> src/mpid/ch3/channels/mrail/src/rdma/ch3_init.c
>> about line 372
>>
>> #if defined(_MCST_SUPPORT_) || defined(_ENABLE_UD_)
>>     mv2_init_timers();
>> #if defined(_MCST_SUPPORT_)
>>
>> I have no idea where these timers are required... However in:
>> src/mpid/ch3/channels/common/src/util/mv2_clock.c
>> at about line 217 is a ifndef which can skip the call to mv2_init_timers()
>> etc.
>>
>> #ifndef DISABLE_LOW_LEVEL_TIMERS
>>
>> I feel there is something strange here. If I am disabling timing collection
>> with --enable-fast, then why some timers are getting initialized? and why
>> mcast support requires them where nothing else seem to require them? is that
>> just result of some quick patching?
>>
>> Is this a bug?
>>
>> Is it advisable to force DISABLE_LOW_LEVEL_TIMERS from within CFLAGS +=
>> '-DDISABLE_LOW_LEVEL_TIMERS' ?
>>
>>
>> Thanks,
>> Evren
>> _______________________________________________
>> mvapich-discuss mailing list
>> mvapich-discuss at cse.ohio-state.edu
>> http://mail.cse.ohio-state.edu/mailman/listinfo/mvapich-discuss
>
>
>
> -- 
> Devendar
>