Thank you Gilles, I think that has made it clear.
Regards,
Rodrigo
On Mon, Mar 20, 2017 at 7:13 PM, Gilles Gouaillardet
wrote:
> Rodrigo,
>
>
> i do not understand what you mean by "deactivate my IB interfaces"
>
>
> the hostfile is only used in the wire-up phase
>
> (to keep things simple, mp
Joshua,
George previously explained you are limited by the size of your level X
cache.
that means that you might get optimal performance for a given message
size, let's say
when everything fits in the L2 cache.
when you increase the message size, L2 cache is too small, and you have
to mo
Rodrigo,
i do not understand what you mean by "deactivate my IB interfaces"
the hostfile is only used in the wire-up phase
(to keep things simple, mpirun does
ssh orted
under the hood, and is coming from your hostfile.
so bottom line
mpirun --mca btl openib,self,sm -hostfile hosts_eth
I don't want to push it up.
I just want to sustain the same bandwidth sending at that optimal size. I'd
like to see a constant bw from that size and above , not a significant drop
when I cross a msg size.
-- Original Message --
Received: 05:11 PM CDT, 03/20/2017
From: George Bosilca
To:
On Mon, Mar 20, 2017 at 12:45 PM, Joshua Mora wrote:
> If at certain x msg size you achieve X performance (MB/s) and at 2x msg
> size
> or higher you achieve Y performance, being Y significantly lower than X,
> is it
> possible to have a parameter that chops messages internally to x size in
> ord
Thanks Guilles for the quick reply. I think I am confused about what the
openib BTL specifies.
What am I doing when I run with the openib BTL but specify my eth interface
(...and deactivate my IB interfaces)?
Is not openib only for IB interfaces?
Am I using RDMA here?
These two commands give the s
If at certain x msg size you achieve X performance (MB/s) and at 2x msg size
or higher you achieve Y performance, being Y significantly lower than X, is it
possible to have a parameter that chops messages internally to x size in order
to sustain X performance rather than let it choke ? sort of flow
You will get similar results with hosts_ib and hosts_eth
If you want to use tcp over ethernet, you have to
mpirun --mca btl tcp,self,sm --mca btl_tcp_if_include eth0 ...
If you want to use tcp over ib, then
mpirun --mca btl tcp,self,sm --mca btl_tcp_if_include ib0 ...
Keep in mind that IMB calls
