[mvapich-discuss] loopback question
LEI CHAI
chai.15 at osu.edu
Fri Apr 27 12:25:15 EDT 2007
Hi Dave,
Thank you for trying out MVAPICH2 0.9.8 with uDAPL.
When processes on the same node are communicating,
they always use the shared memory instead of loopback,
as long as -D_SMP_ flag is defined. There will be
uDAPL connections established among these processes,
but the actual data is not transferred through
loopback. You can try to enable and disable -D_SMP_
flag, and see the performance difference :-)
Thanks.
Lei
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Hello=20
I have a question on loopback .
=20
We are trying to install and configure MVAPICH2 to use shared memory for
intra-node communication instead of loopback connections. I have
installed MVAPICH2 0.9.8 to run over uDAPL on a Linux kernel version
2.6.18.8, using OpenFabrics code v9045 from the SVN repository. iWARP
connections are being established and data transfers are working
correctly as tested with dapltest. We have compiled the MVAPICH2 code
using the -D_SMP_ flag in the makefile, but loopback connections are
still being attempted. Are there more or other configuration options
that will enable shared memory and disable loopback operations?
=20
Regards
=20
Dave
=20
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<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hello <o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'> =
I have a question on loopback =
</span></font>.<o:p></o:p></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-indent:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>We are trying to install =
and
configure MVAPICH2 to use shared memory for intra-node =
communication
instead of loopback connections. I have installed =
MVAPICH2 0.9.8 to
run over uDAPL on a Linux kernel version 2.6.18.8, using =
OpenFabrics
code v9045 from the SVN repository. iWARP connections are being
established and data transfers are working correctly as tested with
dapltest. We have compiled the MVAPICH2 code using the =
-D_SMP_ flag
in the makefile, but loopback connections are still being
attempted. Are there more or other configuration
options that will enable shared memory and disable loopback =
operations?</span></font><o:p></o:p></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Regards<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Dave<o:p></o:p></span></font></p>
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