[mvapich-discuss] Avoiding busy-waiting with ch3:mrails

[Ionescu, A.]

Hi Devendar,

Thanks for your quick reply. I made sure I disabled CPU affinity and that MPI_Init_thread actually provides MPI_THREAD_MULTIPLE support, but I still get 100% CPU load (reported by the top command) while my application is idle. Is there anything else I can do about this?

Please note that I'm using mvapich2-1.8rc1.

Regards,
Adrian
________________________________
From: Devendar Bureddy [bureddy at cse.ohio-state.edu]
Sent: 13 April 2012 19:37
To: Ionescu, A.
Cc: mvapich-discuss at cse.ohio-state.edu
Subject: Re: [mvapich-discuss] Avoiding busy-waiting with ch3:mrails

Hi Adrian

MVAPICH2 library internally disable the busy waiting behavior when running with MPI_THREAD_MULTIPLE. Please make sure you turn off the affinity with thread multiple. Please find more details at http://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-1.8rc1.html#x1-730006.14)

-Devendar

On Fri, Apr 13, 2012 at 5:17 AM, Ionescu, A. <a.ionescu at student.vu.nl<mailto:a.ionescu at student.vu.nl>> wrote:
Dear MVAPICH users,

We are developing a distributed, multi-threaded application that is supposed to communicate over Infiniband. Is there any way we can disable the busy-waiting behaviour of the MVAPICH2 library when using the ch3:mrails channel?

We read about the MV2_USE_THREAD_YIELD  and MV2_THREAD_YIELD_SPIN_THRESHOLD variables that used to be available in previous versions of MVAPICH2, but it appears they have been gotten rid of in the more recent ones. Are there any alternatives? Any advice or suggestions will be greatly appreciated.

Regards,
Adrian

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--
Devendar
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