Jonathan,
It will be difficult to make it works in this configuration. The problem
is that on the head node the network interface that have to be used is
eth1 while on the compute nodes is eth0. Therefore, the tcp_if_include
will not help ...
Now, if you only start processes on the compute nodes you will not have to
face this problem. Right now, I think this is the safest approach.
We have a patch for this kind of problems, but it's not yet in the trunk.
I let you know as soon as we commit it and then you will have to use the
unstable version until the patch make its way into a stable version.
Thanks,
george.
On Mon, 11 Jun 2007, Jonathan Underwood wrote:
Hi,
I am seeing problems with a small linux cluster when running OpenMPI
jobs. The error message I get is:
[frontend][0,1,0][btl_tcp_endpoint.c:572:mca_btl_tcp_endpoint_complete_connect]
connect() failed with errno=110
Following the FAQ, I looked to see what this error code corresponds to:
$ perl -e 'die$!=110'
Connection timed out at -e line 1.
This error message occurs the first time one of the compute nodes,
which are on a private network, attempts to send data to the frontend
(from where the job was started with mpirun).
In actual fact, it seems that the error occurs the first time a
process on the frontend tries to send data to another process on the
frontend.
I tried to play about with things like --mca btl_tcp_if_exclude
lo,eth0, but that didn't help matters. Nothing in the FAQ section on
TCP and routing actually seemed to help.
Any advice would be very welcome
The network configurations are:
a) frontend (2 network adapters, eth1 private for the cluster):
$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:E0:81:30:A1:CE
inet addr:128.40.5.39 Bcast:128.40.5.255 Mask:255.255.255.0
inet6 addr: fe80::2e0:81ff:fe30:a1ce/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3496038 errors:0 dropped:0 overruns:0 frame:0
TX packets:2833685 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:500939570 (477.7 MiB) TX bytes:671589665 (640.4 MiB)
Interrupt:193
eth1 Link encap:Ethernet HWaddr 00:E0:81:30:A1:CF
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::2e0:81ff:fe30:a1cf/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2201778 errors:0 dropped:0 overruns:0 frame:0
TX packets:2046572 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:188615778 (179.8 MiB) TX bytes:247305804 (235.8 MiB)
Interrupt:201
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1528 errors:0 dropped:0 overruns:0 frame:0
TX packets:1528 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:363101 (354.5 KiB) TX bytes:363101 (354.5 KiB)
$ /sbin/route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth1
128.40.5.0 * 255.255.255.0 U 0 0 0 eth0
default 128.40.5.245 0.0.0.0 UG 0 0 0 eth0
b) Compute nodes:
$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:E0:81:30:A0:72
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::2e0:81ff:fe30:a072/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:189207 errors:0 dropped:0 overruns:0 frame:0
TX packets:203507 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:23075241 (22.0 MiB) TX bytes:17693363 (16.8 MiB)
Interrupt:193
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:185 errors:0 dropped:0 overruns:0 frame:0
TX packets:185 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:12644 (12.3 KiB) TX bytes:12644 (12.3 KiB)
$ /sbin/route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
default frontend.cluste 0.0.0.0 UG 0 0 0 eth0
TIS
Jonathan
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