[mvapich-discuss] Cannot utilize CPU core

[MORRIS LAW]

The 'affinity' problem is very new to me.  May I know exactly how I can control running of the jobs with VIADEV_USE_AFFINITY=0?

Should I place the line in /etc/profile or in the mpirun script?  

Best Regards,

--
Morris


----- Original Message -----
From: Dhabaleswar Panda <panda at cse.ohio-state.edu>
Date: Tuesday, March 30, 2010 8:29 pm
Subject: Re: [mvapich-discuss] Cannot utilize CPU core
To: MORRIS LAW <morris at hkbu.edu.hk>
Cc: mvapich-discuss at cse.ohio-state.edu


> You are seeing the effect of `affinity' of processes to cores here. 
> Try to
>  run your jobs with VIADEV_USE_AFFINITY=0. More details on this are
>  available from MVAPICH 1.1 user guide at the following location:
>  
>  http://mvapich.cse.ohio-state.edu/support/mvapich_user_guide-1.1.html#x1-1340009.6.5
>  
>  Let us know if the problem goes away with this option.
>  
>  Also note that MVAPICH2 has many more flexible ways to bind processes 
> to
>  cores. You can use the latest version of MVAPICH2 (1.4.1) to take
>  advantage of these features.
>  
>  DK
>  
>  
>  
>  On Tue, 30 Mar 2010, MORRIS LAW wrote:
>  
>  > Dear all,
>  >
>  > I am new to the discussion group.
>  >
>  > Recently I found a problem of running mvapich 1.1 on Gen2-IB device 
> (Qlogic 9120).  When subsequent run of mvapich job was delivered to 
> the nodes, the later jobs will not run on free CPU cores but will 
> compete with the current running CPU cores.  Thus the whole node 
> cannot be utilized.  I don't know where the problem is.  Is it related 
> to the IB switch or some parameter when I built the mvapich 1.1?
>  >
>  > I built mvapich 1.1 using gcc 4.1 on CentOS 5.3.  I have also built 
> another version of mvapich 1.1 using icc and ifort on the same CentOS 
> 5.3.  Both run jobs having similar problem.
>  >
>  > Would someone give me some hints to tackle the problem?
>  >
>  > Thanks in advance.
>  >
>  > --
>  > Morris Law
>  > HK Baptist University
>  >
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>  >
>  
>