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Subject: Re: [OMPI devel] memory bind warning with -bind-to-core and -bind-to-socket
From: Ralph Castain (rhc_at_[hidden])
Date: 2012-03-14 10:29:06


We should probably improve that warning. It most likely means that libnuma isn't available on that node, but basically it is reporting that hwloc is unable to set the memory binding policy to ensure that all memory is local to the cpu-bound location.

On Mar 14, 2012, at 8:06 AM, Rolf vandeVaart wrote:

> I am running a simple test and using the -bind-to-core or -bind-to-socket options. I think the CPU binding is working fine, but I see these warnings about not being able to bind to memory. Is this expected? This is trunk code (266128)
>
> [dt]$ mpirun --report-bindings -np 2 -bind-to-core connectivity_c
> --------------------------------------------------------------------------
> WARNING: a request was made to bind a process. While the system supports binding the process itself, at least one node does NOT support binding memory to the process location.
>
> Node: dt
>
> This is a warning only; your job will continue, though performance may be degraded.
> --------------------------------------------------------------------------
> [dt:03600] [[52612,0],0] odls:default binding child [[52612,1],1] to cpus 1,5
> [dt:03600] [[52612,0],0] odls:default binding child [[52612,1],0] to cpus 0,4
> [dt:03601] [[52612,1],0] is bound to cpus 0,4
> [dt:03602] [[52612,1],1] is bound to cpus 1,5
> Connectivity test on 2 processes PASSED.
>
> I see this on two different clusters.
>
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